PatchGap
Chrome · V8 › Modules

CVE-2026-103625

Type Confusion in V8 (Modules)
High chrome Type Confusion 📄 Reporter bug report 🔧 Commit mapped

Overview

High
Severity
—
CVSS
No
Exploited ITW
Fixed
Fix Status
ImpactType confusion in V8
DescriptionType confusion in V8
ComponentV8
Sub-componentModules
Bug ClassType Confusion
Tracker559893859
Fix commitd87667efceca (v8/v8) +184/-20
CISA KEVNot listed
CreditedGoogle
Disclosed2026-10-01

Changed Functions

FunctionChangeNotes
for
src/objects/source-text-module.cc
 modified
if
src/objects/source-text-module.cc
 modified

Files Changed

  • src/objects/module.cc
  • src/diagnostics/objects-debug.cc
  • src/objects/source-text-module.h
  • test/mjsunit/regress/regress-559893859.js
  • src/objects/source-text-module.cc

Patch

view commit
From d87667efceca59930360c752dae519c96463eba4 Mon Sep 17 00:00:00 2001
From: Olivier Flückiger <olivf@chromium.org>
Date: Thu, 24 Sep 2026 14:00:46 +0000
Subject: [PATCH] [modules] Fix partial SCC linking failure

When linking a strongly connected component (SCC) of cyclic
SourceTextModules in SourceTextModule::MaybeTransitionComponent, run
RunInitializationCode on all modules in the SCC before transitioning
any of them to kLinked. Previously, if RunInitializationCode failed on
a later module in the SCC, earlier modules in the same SCC were already
marked kLinked and skipped by Module::ResetGraph.

Update GetSharedFunctionInfo, SourceTextModule::Reset, and
SourceTextModuleVerify to handle modules in kLinking whose code slot
already holds a JSGeneratorObject (which is observable both during GC
within the SCC initialization loop and on failure unwind).

TAG=agy
CONV=2054e998-f4df-457c-bb72-ee1f86025ea2

Bug: 559893859
Change-Id: I9df38f8472e1e2a390e18f1957f06cdf25bf1bad
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/8450453
Commit-Queue: Olivier Flückiger <olivf@chromium.org>
Auto-Submit: Olivier Flückiger <olivf@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#110072}
---
diff --git a/src/diagnostics/objects-debug.cc b/src/diagnostics/objects-debug.cc
index fe47290..ee98573 100644
--- a/src/diagnostics/objects-debug.cc
+++ b/src/diagnostics/objects-debug.cc
@@ -3131,7 +3131,7 @@
     if (status() == kLinked) {
       CHECK(IsJSGeneratorObject(code()));
     } else if (status() == kLinking) {
-      CHECK(IsJSFunction(code()));
+      CHECK(IsJSFunction(code()) || IsJSGeneratorObject(code()));
     } else if (status() == kPreLinking) {
       CHECK(IsSharedFunctionInfo(code()));
     } else if (status() == kUnlinked) {
@@ -3142,7 +3142,7 @@
     CHECK(!HasAsyncEvaluationOrdinal());
   }
 
-  CHECK_EQ(requested_modules()->length(), info()->module_requests()->length());
+  VerifyRequestedModules();
 }
 
 void SyntheticModule::SyntheticModuleVerify(Isolate* isolate) {
diff --git a/src/objects/module.cc b/src/objects/module.cc
index 4410fe0..1865ea0 100644
--- a/src/objects/module.cc
+++ b/src/objects/module.cc
@@ -128,6 +128,11 @@
 void Module::ResetGraph(Isolate* isolate, DirectHandle<Module> module) {
   DCHECK_NE(module->status(), kEvaluating);
   if (module->status() != kPreLinking && module->status() != kLinking) {
+#ifdef DEBUG
+    if (IsSourceTextModule(*module)) {
+      Cast<SourceTextModule>(*module)->VerifyRequestedModules();
+    }
+#endif  // DEBUG
     return;
   }
 
@@ -202,8 +207,8 @@
         loc, must_resolve, resolve_set);
   } else {
     return SyntheticModule::ResolveExport(
-        isolate, Cast<SyntheticModule>(module), module_specifier, export_name,
-        loc, must_resolve);
+        isolate, CheckedCast<SyntheticModule>(module), module_specifier,
+        export_name, loc, must_resolve);
   }
 }
 
diff --git a/src/objects/source-text-module.cc b/src/objects/source-text-module.cc
index 25edc41..a11192b 100644
--- a/src/objects/source-text-module.cc
+++ b/src/objects/source-text-module.cc
@@ -94,7 +94,9 @@
     case kPreLinking:
       return Cast<SharedFunctionInfo>(code());
     case kLinking:
-      return Cast<JSFunction>(code())->shared();
+      return IsJSGeneratorObject(code())
+                 ? Cast<JSGeneratorObject>(code())->function()->shared()
+                 : Cast<JSFunction>(code())->shared();
     case kLinked:
     case kEvaluating:
     case kEvaluatingAsync:
@@ -111,6 +113,26 @@
   return Cast<Script>(GetSharedFunctionInfo()->script());
 }
 
+#if defined(DEBUG) || defined(VERIFY_HEAP)
+void SourceTextModule::VerifyRequestedModules() const {
+  DisallowGarbageCollection no_gc;
+  Tagged<FixedArray> requests = info()->module_requests();
+  Tagged<FixedArray> modules = requested_modules();
+  uint32_t len = modules->ulength().value();
+  CHECK_EQ(len, requests->ulength().value());
+  if (status() >= kLinked) {
+    for (uint32_t i = 0; i < len; ++i) {
+      Tagged<ModuleRequest> req = Cast<ModuleRequest>(requests->get(i));
+      if (req->phase() != ModuleImportPhase::kSource) {
+        Tagged<Object> m = modules->get(i);
+        CHECK(IsModule(m));
+        CHECK_GE(Cast<Module>(m)->status(), kLinked);
+      }
+    }
+  }
+}
+#endif  // defined(DEBUG) || defined(VERIFY_HEAP)
+
 int SourceTextModule::ExportIndex(int cell_index) {
   DCHECK_EQ(SourceTextModuleDescriptor::GetCellIndexKind(cell_index),
             SourceTextModuleDescriptor::kExport);
@@ -276,7 +298,8 @@
     case ModuleImportPhase::kDefer:
     case ModuleImportPhase::kEvaluation: {
       Handle<Module> requested_module(
-          Cast<Module>(module->requested_modules()->get(module_request_index)),
+          CheckedCast<Module>(
+              module->requested_modules()->get(module_request_index)),
           isolate);
       DirectHandle<String> module_specifier(
           Cast<String>(module_request->specifier()), isolate);
@@ -487,7 +510,8 @@
 bool SourceTextModule::RunInitializationCode(
     Isolate* isolate, DirectHandle<SourceTextModule> module) {
   DCHECK_EQ(module->status(), kLinking);
-  DirectHandle<JSFunction> function(Cast<JSFunction>(module->code()), isolate);
+  DirectHandle<JSFunction> function(CheckedCast<JSFunction>(module->code()),
+                                    isolate);
   DCHECK_EQ(MODULE_SCOPE, function->shared()->scope_info()->scope_type());
   DirectHandle<Object> receiver = isolate->factory()->undefined_value();
 
@@ -562,6 +586,7 @@
     //    ix. Set requiredModule.[[CycleRoot]] to module.
     //
     // InnerModuleLinking
+    // https://tc39.es/ecma262/#sec-InnerModuleLinking
     //
     // a. Let done be false.
     // b. Repeat, while done is false,
@@ -571,15 +596,43 @@
     //    iv. Set requiredModule.[[Status]] to LINKED.
     //     v. If requiredModule and module are the same Module Record, set done
     //        to true.
+    if (new_status == kLinked) {
+      // In the spec, InnerModuleLinking step 10 performs
+      // ? module.InitializeEnvironment() for every module in the strongly
+      // connected component (SCC) before the SCC root reaches the infallible
+      // status-transition loop at step 13, ensuring that all modules in an SCC
+      // transition to ~linked~ atomically and that on abrupt completion every
+      // module on stack still has [[Status]] == ~linking~ (Link step 4.a.i,
+      // https://tc39.es/ecma262/#sec-moduledeclarationlinking).
+      //
+      // V8 splits InitializeEnvironment() into two parts: static import and
+      // indirect-export resolution runs at the step-10 position in
+      // FinishInstantiate, while environment and namespace instantiation
+      // (RunInitializationCode) is deferred until all imports and indirect
+      // exports across the SCC have been resolved. Because
+      // RunInitializationCode can fail (e.g. stack overflow or termination), it
+      // must complete for every module in the SCC before any module in the SCC
+      // transitions to kLinked below.
+      bool found = false;
+      for (DirectHandle<SourceTextModule> required_module : *stack) {
+        DCHECK_EQ(required_module->status(), kLinking);
+        if (!SourceTextModule::RunInitializationCode(isolate,
+                                                     required_module)) {
+          return false;
+        }
+        if (*required_module == *module) {
+          found = true;
+          break;
+        }
+      }
+      CHECK(found);
+    }
     do {
       ancestor = stack->front();
       stack->pop_front();
       DCHECK_EQ(ancestor->status(),
                 new_status == kLinked ? kLinking : kEvaluating);
       if (new_status == kLinked) {
-        if (!SourceTextModule::RunInitializationCode(isolate, ancestor)) {
-          return false;
-        }
         ancestor->SetStatus(kLinked);
       } else {
         DCHECK(ancestor->async_evaluation_ordinal() == kNotAsyncEvaluated ||
@@ -631,8 +684,8 @@
     if (module_request->phase() == ModuleImportPhase::kSource) {
       continue;
     }
-    Handle<Module> requested_module(Cast<Module>(requested_modules->get(i)),
-                                    isolate);
+    Handle<Module> requested_module(
+        CheckedCast<Module>(requested_modules->get(i)), isolate);
     if (!Module::FinishInstantiate(isolate, requested_module, stack, dfs_index,
                                    zone, depth + 1, max_depth)) {
       return false;
@@ -659,7 +712,13 @@
   Handle<Script> script(module->GetScript(), isolate);
   DirectHandle<SourceTextModuleInfo> module_info(module->info(), isolate);
 
-  // Resolve imports.
+  // Resolve imports (InitializeEnvironment step 7) and indirect exports
+  // (InitializeEnvironment step 1).
+  //
+  // Note: Environment and namespace creation (InitializeEnvironment steps 5-6
+  // and 7.b-26) is performed by RunInitializationCode in
+  // MaybeTransitionComponent once all imports and indirect exports in the
+  // strongly connected component are resolved.
   DirectHandle<FixedArray> regular_imports(module_info->regular_imports(),
                                            isolate);
   const uint32_t regular_imports_len = regular_imports->ulength().value();
@@ -670,6 +729,7 @@
     MessageLocation loc(script, entry->beg_pos(), entry->end_pos());
     ResolveSet resolve_set(zone);
     DirectHandle<Cell> cell;
+    DCHECK_EQ(module->status(), Module::kLinking);
     if (!ResolveImport(isolate, module, name, entry->module_request(), loc,
                        true, &resolve_set)
              .ToHandle(&cell)) {
@@ -739,7 +799,8 @@
                  ->phase(),
              ModuleImportPhase::kEvaluation);
     Handle<Module> requested_module(
-        Cast<Module>(module->requested_modules()->get(entry->module_request())),
+        CheckedCast<Module>(
+            module->requested_modules()->get(entry->module_request())),
         isolate);
 
     // Recurse.
@@ -849,7 +910,8 @@
   CHECK_NE(module_request->phase(), ModuleImportPhase::kSource);
 
   Handle<Module> requested_module(
-      Cast<Module>(module->requested_modules()->get(module_request_index)),
+      CheckedCast<Module>(
+          module->requested_modules()->get(module_request_index)),
       isolate);
   return Module::GetModuleNamespace(isolate, requested_module,
                                     module_request->phase());
@@ -1322,8 +1384,8 @@
       continue;
     }
 
-    Handle<Module> requested_module(Cast<Module>(requested_modules->get(i)),
-                                    isolate);
+    Handle<Module> requested_module(
+        CheckedCast<Module>(requested_modules->get(i)), isolate);
     if (module_request->phase() == ModuleImportPhase::kDefer) {
       ZoneVector<Handle<SourceTextModule>> async_evaluation_list(&zone);
       GatherAsynchronousTransitiveDependencies(
@@ -1520,8 +1582,8 @@
       continue;
     }
 
-    Handle<Module> requested_module(Cast<Module>(requested_modules->get(i)),
-                                    isolate);
+    Handle<Module> requested_module(
+        CheckedCast<Module>(requested_modules->get(i)), isolate);
 
     GatherAsynchronousTransitiveDependencies(
         isolate, requested_module, evaluation_set, evaluation_list, seen_set);
@@ -1590,7 +1652,12 @@
   DisallowGarbageCollection no_gc;
   Tagged<SourceTextModule> raw_module = *module;
   if (raw_module->status() == kLinking) {
-    raw_module->set_code(Cast<JSFunction>(raw_module->code())->shared());
+    // A kLinking module on stack (Link step 4.a,
+    // https://tc39.es/ecma262/#sec-moduledeclarationlinking) holds either a
+    // JSFunction (before RunInitializationCode) or a JSGeneratorObject (if a
+    // later module in the same SCC failed RunInitializationCode). Restore the
+    // underlying SharedFunctionInfo for kUnlinked.
+    raw_module->set_code(raw_module->GetSharedFunctionInfo());
   }
   raw_module->set_regular_exports(*regular_exports);
   raw_module->set_regular_imports(*regular_imports);
diff --git a/src/objects/source-text-module.h b/src/objects/source-text-module.h
index 0c390e9..d473613 100644
--- a/src/objects/source-text-module.h
+++ b/src/objects/source-text-module.h
@@ -28,6 +28,10 @@
   DECL_VERIFIER(SourceTextModule)
   DECL_PRINTER(SourceTextModule)
 
+#if defined(DEBUG) || defined(VERIFY_HEAP)
+  void VerifyRequestedModules() const;
+#endif
+
   // The shared function info in case {status} is not kEvaluating, kEvaluated or
   // kErrored.
   Tagged<SharedFunctionInfo> GetSharedFunctionInfo() const;
diff --git a/test/mjsunit/regress/regress-559893859.js b/test/mjsunit/regress/regress-559893859.js
new file mode 100644
index 0000000..6db1ddb
--- /dev/null
+++ b/test/mjsunit/regress/regress-559893859.js
@@ -0,0 +1,88 @@
+// Copyright 2026 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --bundle --stack-size=100 --js-defer-import-eval
+
+// cycle-root.mjs and cycle-member.mjs form a cycle, i.e. a single strongly
+// connected component. Linking the component calls
+// SourceTextModule::RunInitializationCode for each of its modules, which calls
+// the module body's generator function just to create the generator object.
+//
+// The body of cycle-root.mjs is a call with 16000 arguments, so the module needs
+// an interpreter register file of ~125KB. That is larger than the entire
+// --stack-size=100 stack, so the stack check at the entry of that call fails
+// unconditionally, and initialization of the component fails halfway through.
+// The only requirement is "arguments * 8 bytes > stack size"; the test does not
+// depend on an exact stack depth.
+//
+// cycle-member.mjs used to be left behind as LINKED while cycle-root.mjs was
+// reset to UNLINKED, so every later traversal of cycle-member.mjs's exports
+// walked into the half-reset cycle-root.mjs. The four importers below reach it
+// through four different traversals.
+
+// JS_BUNDLE_MODULE:cycle-root.mjs
+export * from "cycle-member.mjs";
+f(
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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+
+// JS_BUNDLE_MODULE:cycle-member.mjs
+export * from "cycle-root.mjs";
+
+// Named import resolved through a star export: SourceTextModule::ResolveImport.
+// JS_BUNDLE_MODULE:named-import.mjs
+import {missing} from "cycle-member.mjs";
+
+// Module namespace: GetModuleNamespace / FetchStarExports.
+// JS_BUNDLE_MODULE:namespace-import.mjs
+import * as ns from "cycle-member.mjs";
+ns.missing;
+
+// Indirect re-export: the special_exports loop in FinishInstantiate.
+// JS_BUNDLE_MODULE:indirect-export.mjs
+export {missing} from "cycle-member.mjs";
+
+// Deferred namespace: reads requested_modules of the half-reset module.
+// JS_BUNDLE_MODULE:deferred-import.mjs
+import defer * as deferred_ns from "cycle-member.mjs";
+
+// JS_BUNDLE_MODULE_ENTRYPOINT
+// Linking has to keep failing in the same way; no importer may ever observe a
+// partially linked component.
+for (const specifier of ["cycle-root.mjs", "named-import.mjs",
+                         "namespace-import.mjs", "indirect-export.mjs",
+                         "deferred-import.mjs", "cycle-root.mjs",
+                         "cycle-member.mjs"]) {
+  await assertThrowsAsync(import(specifier), RangeError);
+}
Loading diff…

Regression Test / PoC

shipped with the fix
diff --git a/test/mjsunit/regress/regress-559893859.js b/test/mjsunit/regress/regress-559893859.js
new file mode 100644
index 0000000..6db1ddb
--- /dev/null
+++ b/test/mjsunit/regress/regress-559893859.js
@@ -0,0 +1,88 @@
+// Copyright 2026 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --bundle --stack-size=100 --js-defer-import-eval
+
+// cycle-root.mjs and cycle-member.mjs form a cycle, i.e. a single strongly
+// connected component. Linking the component calls
+// SourceTextModule::RunInitializationCode for each of its modules, which calls
+// the module body's generator function just to create the generator object.
+//
+// The body of cycle-root.mjs is a call with 16000 arguments, so the module needs
+// an interpreter register file of ~125KB. That is larger than the entire
+// --stack-size=100 stack, so the stack check at the entry of that call fails
+// unconditionally, and initialization of the component fails halfway through.
+// The only requirement is "arguments * 8 bytes > stack size"; the test does not
+// depend on an exact stack depth.
+//
+// cycle-member.mjs used to be left behind as LINKED while cycle-root.mjs was
+// reset to UNLINKED, so every later traversal of cycle-member.mjs's exports
+// walked into the half-reset cycle-root.mjs. The four importers below reach it
+// through four different traversals.
+
+// JS_BUNDLE_MODULE:cycle-root.mjs
+export * from "cycle-member.mjs";
+f(
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+
+// JS_BUNDLE_MODULE:cycle-member.mjs
+export * from "cycle-root.mjs";
+
+// Named import resolved through a star export: SourceTextModule::ResolveImport.
+// JS_BUNDLE_MODULE:named-import.mjs
+import {missing} from "cycle-member.mjs";
+
+// Module namespace: GetModuleNamespace / FetchStarExports.
+// JS_BUNDLE_MODULE:namespace-import.mjs
+import * as ns from "cycle-member.mjs";
+ns.missing;
+
+// Indirect re-export: the special_exports loop in FinishInstantiate.
+// JS_BUNDLE_MODULE:indirect-export.mjs
+export {missing} from "cycle-member.mjs";
+
+// Deferred namespace: reads requested_modules of the half-reset module.
+// JS_BUNDLE_MODULE:deferred-import.mjs
+import defer * as deferred_ns from "cycle-member.mjs";
+
+// JS_BUNDLE_MODULE_ENTRYPOINT
+// Linking has to keep failing in the same way; no importer may ever observe a
+// partially linked component.
+for (const specifier of ["cycle-root.mjs", "named-import.mjs",
+                         "namespace-import.mjs", "indirect-export.mjs",
+                         "deferred-import.mjs", "cycle-root.mjs",
+                         "cycle-member.mjs"]) {
+  await assertThrowsAsync(import(specifier), RangeError);
+}
Loading diff…

Original Bug Report

reported by rj...@google.com

Type confusion in Module::ResolveExport due to partial SCC linking failure in V8

Flapjack has identified a security issue and generated a PoC.

Build variant: AsanArm64

Build arguments: is_asan=true is_debug=false dcheck_always_on=false symbol_level=1 v8_enable_memory_corruption_api=true v8_enable_sandbox=true target_cpu="x64" v8_target_cpu="arm64"

Shell command: d8 --run-as-security-poc --sim-stack-size=100 --bundle --omit-quit --disable-in-process-stack-traces

Return code: 134

<details>

<summary>stdout</summary>

/tmp/poc/m1.mjs:1: RangeError: Maximum call stack size exceeded
export * from "m2.mjs";
^
RangeError: Maximum call stack size exceeded
    at /tmp/poc/m1.mjs:1:1

m1 caught: Maximum call stack size exceeded

</details>

<details>

<summary>stderr</summary>

AddressSanitizer:DEADLYSIGNAL
=================================================================
==10==ERROR: AddressSanitizer: SEGV on unknown address 0x71fdfff7000e (pc 0x6193cc5a8223 bp 0x7ffce1050ab0 sp 0x7ffce1050a70 T0)
==10==The signal is caused by a READ memory access.
    #0 0x6193cc5a8223 in v8::internal::ObjectHashTableBase<v8::internal::ObjectHashTable, v8::internal::ObjectHashTableShape>::Lookup(v8::internal::DirectHandle<v8::internal::Object>) third_party/libc++/src/include/__atomic/atomic_ref.h:152:5
    #1 0x6193cc690ffc in v8::internal::SyntheticModule::ResolveExport(v8::internal::Isolate*, v8::internal::DirectHandle<v8::internal::SyntheticModule>, v8::internal::DirectHandle<v8::internal::String>, v8::internal::DirectHandle<v8::internal::String>, v8::internal::MessageLocation, bool) v8/src/objects/synthetic-module.cc:59:44
    #2 0x6193cc58d785 in v8::internal::Module::ResolveExport(v8::internal::Isolate*, v8::internal::Handle<v8::internal::Module>, v8::internal::DirectHandle<v8::internal::String>, v8::internal::Handle<v8::internal::String>, v8::internal::MessageLocation, bool, v8::internal::Module::ResolveSet*) v8/src/objects/module.cc:204:12
    #3 0x6193cc630a82 in v8::internal::SourceTextModule::ResolveImport(v8::internal::Isolate*, v8::internal::DirectHandle<v8::internal::SourceTextModule>, v8::internal::MaybeHandle<v8::internal::String>, int, v8::internal::MessageLocation, bool, v8::internal::Module::ResolveSet*) v8/src/objects/source-text-module.cc:286:13
    #4 0x6193cc62fb2e in v8::internal::SourceTextModule::ResolveExportUsingStarExports(v8::internal::Isolate*, v8::internal::DirectHandle<v8::internal::SourceTextModule>, v8::internal::DirectHandle<v8::internal::String>, v8::internal::Handle<v8::internal::String>, v8::internal::MessageLocation, bool, v8::internal::Module::ResolveSet*) v8/src/objects/source-text-module.cc:326:11
    #5 0x6193cc62e225 in v8::internal::SourceTextModule::ResolveExport(v8::internal::Isolate*, v8::internal::Handle<v8::internal::SourceTextModule>, v8::internal::DirectHandle<v8::internal::String>, v8::internal::Handle<v8::internal::String>, v8::internal::MessageLocation, bool, v8::internal::Module::ResolveSet*) v8/src/objects/source-text-module.cc:219:12
    #6 0x6193cc58d720 in v8::internal::Module::ResolveExport(v8::internal::Isolate*, v8::internal::Handle<v8::internal::Module>, v8::internal::DirectHandle<v8::internal::String>, v8::internal::Handle<v8::internal::String>, v8::internal::MessageLocation, bool, v8::internal::Module::ResolveSet*) v8/src/objects/module.cc:200:12
    #7 0x6193cc630a82 in v8::internal::SourceTextModule::ResolveImport(v8::internal::Isolate*, v8::internal::DirectHandle<v8::internal::SourceTextModule>, v8::internal::MaybeHandle<v8::internal::String>, int, v8::internal::MessageLocation, bool, v8::internal::Module::ResolveSet*) v8/src/objects/source-text-module.cc:286:13
    #8 0x6193cc62fb2e in v8::internal::SourceTextModule::ResolveExportUsingStarExports(v8::internal::Isolate*, v8::internal::DirectHandle<v8::internal::SourceTextModule>, v8::internal::DirectHandle<v8::internal::String>, v8::internal::Handle<v8::internal::String>, v8::internal::MessageLocation, bool, v8::internal::Module::ResolveSet*) v8/src/objects/source-text-module.cc:326:11
    #9 0x6193cc62e225 in v8::internal::SourceTextModule::ResolveExport(v8::internal::Isolate*, v8::internal::Handle<v8::internal::SourceTextModule>, v8::internal::DirectHandle<v8::internal::String>, v8::internal::Handle<v8::internal::String>, v8::internal::MessageLocation, bool, v8::internal::Module::ResolveSet*) v8/src/objects/source-text-module.cc:219:12
    #10 0x6193cc58d720 in v8::internal::Module::ResolveExport(v8::internal::Isolate*, v8::internal::Handle<v8::internal::Module>, v8::internal::DirectHandle<v8::internal::String>, v8::internal::Handle<v8::internal::String>, v8::internal::MessageLocation, bool, v8::internal::Module::ResolveSet*) v8/src/objects/module.cc:200:12
    #11 0x6193cc630a82 in v8::internal::SourceTextModule::ResolveImport(v8::internal::Isolate*, v8::internal::DirectHandle<v8::internal::SourceTextModule>, v8::internal::MaybeHandle<v8::internal::String>, int, v8::internal::MessageLocation, bool, v8::internal::Module::ResolveSet*) v8/src/objects/source-text-module.cc:286:13
    #12 0x6193cc634ace in v8::internal::SourceTextModule::FinishInstantiate(v8::internal::Isolate*, v8::internal::Handle<v8::internal::SourceTextModule>, v8::internal::ZoneForwardList<v8::internal::Handle<v8::internal::SourceTextModule>>*, unsigned int*, v8::internal::Zone*, unsigned int, unsigned int*) v8/src/objects/source-text-module.cc:673:10
    #13 0x6193cc58dcda in v8::internal::Module::Instantiate(v8::internal::Isolate*, v8::internal::Handle<v8::internal::Module>, v8::Local<v8::Context>, v8::internal::Module::UserResolveCallbacks const&) v8/src/objects/module.cc:268:12
    #14 0x6193cb4617a0 in v8::Module::InstantiateModule(v8::Local<v8::Context>, v8::MaybeLocal<v8::Module> (*)(v8::Local<v8::Context>, v8::Local<v8::String>, v8::Local<v8::FixedArray>, v8::Local<v8::Module>), v8::MaybeLocal<v8::Object> (*)(v8::Local<v8::Context>, v8::Local<v8::String>, v8::Local<v8::FixedArray>, v8::Local<v8::Module>)) v8/src/api/api.cc:2423:8
    #15 0x6193cb3bdb1a in v8::Shell::DoHostImportModuleDynamically(v8::Local<v8::Data>) v8/src/d8/d8.cc:2130:19
    #16 0x6193ccaaeeb1 in v8::internal::Runtime_RunMicrotaskCallback(int, unsigned long*, v8::internal::Isolate*) v8/src/runtime/runtime-promise.cc:88:5
    #17 0x6193ce22ade2 in v8::internal::Simulator::DoRuntimeCall(v8::internal::Instruction*) v8/src/execution/arm64/simulator-arm64.cc:562:10
    #18 0x6193ce2290d3 in v8::internal::Simulator::ExecuteInstruction() v8/src/execution/arm64/simulator-arm64.h:976:5
    #19 0x6193ce228d27 in v8::internal::Simulator::Run() v8/src/execution/arm64/simulator-arm64.cc:483:7
    #20 0x6193ce226490 in v8::internal::Simulator::CallImpl(unsigned long, v8::internal::Simulator::CallArgument*) v8/src/execution/arm64/simulator-arm64.cc:235:3
    #21 0x6193cb8219d4 in v8::internal::(anonymous namespace)::Invoke(v8::internal::Isolate*, v8::internal::(anonymous namespace)::InvokeParams const&) v8/src/execution/arm64/simulator-arm64.h:732:5
    #22 0x6193cb825616 in v8::internal::(anonymous namespace)::InvokeWithTryCatch(v8::internal::Isolate*, v8::internal::(anonymous namespace)::InvokeParams const&) v8/src/execution/execution.cc:553:18
    #23 0x6193cb825a05 in v8::internal::Execution::TryRunMicrotasks(v8::internal::Isolate*, v8::internal::MicrotaskQueue*) v8/src/execution/execution.cc:657:10
    #24 0x6193cb8c995f in v8::internal::MicrotaskQueue::RunMicrotasks(v8::internal::Isolate*) v8/src/execution/microtask-queue.cc:220:22
    #25 0x6193cb8c9406 in v8::internal::MicrotaskQueue::PerformCheckpointInternal(v8::Isolate*) v8/src/execution/microtask-queue.cc:163:3
    #26 0x6193cb892822 in v8::internal::Isolate::FireCallCompletedCallbackInternal(v8::internal::MicrotaskQueue*) v8/src/execution/microtask-queue.h:58:5
    #27 0x6193cb4ad758 in v8::CallDepthScope<true>::~CallDepthScope() v8/src/execution/isolate.h:1864:5
    #28 0x6193cb461fcd in v8::Module::Evaluate(v8::Local<v8::Context>) v8/src/api/api-inl.h:262:20
    #29 0x6193cb3c340f in v8::Shell::ExecuteModule(v8::Isolate*, char const*) v8/src/d8/d8.cc:2241:24
    #30 0x6193cb3f75a2 in v8::TryExecuteBundle(v8::Isolate*, std::__Cr::basic_string<char, std::__Cr::char_traits<char>, std::__Cr::allocator<char>> const&, v8::Local<v8::String>, bool*) v8/src/d8/d8.cc:6202:12
    #31 0x6193cb3f9036 in v8::SourceGroup::Execute(v8::Isolate*) v8/src/d8/d8.cc:6329:11
    #32 0x6193cb407c41 in v8::Shell::RunMainIsolate(v8::Isolate*, bool) v8/src/d8/d8.cc:7461:37
    #33 0x6193cb40709d in v8::Shell::RunMain(v8::Isolate*, bool) v8/src/d8/d8.cc:7375:18
    #34 0x6193cb40bbea in v8::Shell::Main(int, char**) v8/src/d8/d8.cc:8343:18
    #35 0x77456c86b1c9  (/lib/x86_64-linux-gnu/libc.so.6+0x2a1c9) (BuildId: 328820b908de8ea1ef79afa8995e302e819163d7)
    #36 0x77456c86b28a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2a28a) (BuildId: 328820b908de8ea1ef79afa8995e302e819163d7)
    #37 0x6193cb290029 in _start (/home/rjlothian_google_com/chromium_ro/src/out/AsanArm64/d8+0x15a0029) (BuildId: 1dbe7fcb0d08ac46)

==10==Register values:
rax = 0x0000000000000000  rbx = 0x00007ffce1050ac0  rcx = 0x0000000000000000  rdx = 0x0000000000000000  
rdi = 0x000071fdfff7000e  rsi = 0x00000000243422a6  rbp = 0x00007ffce1050ab0  rsp = 0x00007ffce1050a70  
 r8 = 0x00006193d28f8880   r9 = 0x00007fffffffff01  r10 = 0x00007fffffffff01  r11 = 0x000076656bbe1001  
r12 = 0x000071fd0101e519  r13 = 0x000075956bbed138  r14 = 0x000073456a830f00  r15 = 0x00000000243422a6  
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV third_party/libc++/src/include/__atomic/atomic_ref.h:152:5 in v8::internal::ObjectHashTableBase<v8::internal::ObjectHashTable, v8::internal::ObjectHashTableShape>::Lookup(v8::internal::DirectHandle<v8::internal::Object>)
==10==ABORTING

</details>

Overview: A failure during SourceTextModule initialization within a strongly connected component (SCC) causes earlier modules in the component to remain in a linked state while the failing module is reset. This leaves the graph in a corrupted state where requested_modules contains the undefined sentinel. Subsequent export resolution dereferences this undefined value as a SyntheticModule, leading to type confusion and memory corruption.

Affected files:

  • v8/src/objects/source-text-module.cc
  • v8/src/objects/module.cc
  • v8/src/objects/synthetic-module.cc

Estimated timestamp from git blame: 2020-02-12

Summary

When linking a strongly connected component (SCC) of cyclic ES modules, SourceTextModule::MaybeTransitionComponent sets the status of each ancestor in the stack to kLinked iteratively as RunInitializationCode succeeds for each module. If RunInitializationCode fails for a later module in the SCC (for instance, due to a RangeError: Maximum call stack size exceeded), the function aborts early without rolling back the modules already transitioned to kLinked.

Subsequently, Module::Instantiate invokes Module::ResetGraph, but ResetGraph explicitly ignores any module whose status is not kPreLinking or kLinking. Consequently, the module that failed initialization is reset to kUnlinked and its requested_modules array is replaced with a newly allocated array containing undefined elements, whereas the earlier module remains in kLinked state.

When another module later attempts to resolve an export that traverses through the linked module into the unlinked module’s star exports, SourceTextModule::ResolveImport reads undefined from requested_modules and passes it to Module::ResolveExport. Because undefined (an Oddball) is not a SourceTextModule, Module::ResolveExport falls through to downcast it to SyntheticModule, leading to invalid memory reads and wild pointer dereference in SyntheticModule::ResolveExport and ObjectHashTableBase::Lookup.

Root Cause Analysis

  1. v8/src/objects/source-text-module.cc (SourceTextModule::MaybeTransitionComponent lines 574–584): The loop pops modules from stack and immediately transitions them to kLinked after executing RunInitializationCode on each module. If RunInitializationCode fails on a subsequent module, previous modules in the SCC remain in kLinked.
  2. v8/src/objects/module.cc (Module::ResetGraph lines 128–132): ResetGraph checks if (module->status() != kPreLinking && module->status() != kLinking) return;. It skips modules that were transitioned to kLinked, resulting in an inconsistent module graph where m2 (in kLinked status) retains a reference to m1 (in kUnlinked status).
  3. v8/src/objects/source-text-module.cc (SourceTextModule::Reset lines 1587–1597): Reset initializes m1->requested_modules() with an empty/unpopulated FixedArray filled with undefined.
  4. v8/src/objects/module.cc (Module::ResolveExport lines 199–207) & v8/src/objects/synthetic-module.cc (line 59): SourceTextModule::ResolveImport retrieves m1->requested_modules()->get(i) without verifying that it is a valid Module, passing undefined to Module::ResolveExport. The !IsSourceTextModule(*module) check misclassifies undefined as a SyntheticModule, causing SyntheticModule::ResolveExport to treat undefined’s internal fields as an ObjectHashTable pointer.

Reproduction Steps

Run the following module bundle with d8:

// m2.mjs
export * from "m1.mjs";
export const m2_val = 2;

// m1.mjs
export * from "m2.mjs";
Math.min(0, /* ... large argument list to trigger call stack limit during initialization ... */);
export const m1_val = 1;

// m3.mjs
import { non_existent_export } from "m2.mjs";
export const m3_val = non_existent_export;

// Entry point
import("m1.mjs").catch(() => {
  import("m3.mjs");
});

Impact

Type confusion in the JavaScript engine allows reading/dereferencing arbitrary memory within the renderer process, leading to sandbox-contained memory corruption (High Severity / S1).

Evaluated with Chrome root at commit: 9a96ec9d13c0d77bdd67b11b39b639eaf59b2b63

The description of the vuln is LLM-generated and can contain mistakes. Your feedback is appreciated, and will help us make improvement over time. The PoC was run in a VM and it seemed to be legit - if not, let us know and we can strengthen our checker. Please see https://chromium.googlesource.com/chromium/src/+/main/docs/security/ai-generated-security-bugs-faq.md for more information.

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