| Título | LLVM LLVM Project commit 3b3a3c2 Stack-based Buffer Overflow |
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| Descrição | A stack buffer overflow vulnerability exists in LLVM’s ValueSymbolTable module when parsing malformed bitcode files. The actual bug resides in the optimized inline logic of llvm::StringMap::insert(). When processing maliciously crafted bitcode via the llvm-opt-fuzzer (x86_64-gvn pass), incorrect stack offset calculation for temporary stack values during symbol table insertion triggers an out-of-bounds stack write. The faulty assembly instruction mov qword ptr [rbx + 0x48], r12 causes stack corruption and program crash, even when core runtime objects are valid. The vulnerability can be triggered by a custom malicious bitcode PoC. Local attackers can exploit this flaw to crash the affected process, with potential memory corruption and arbitrary code execution risks under specific memory layouts. |
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| Fonte | ⚠️ https://github.com/llvm/llvm-project/issues/199187 |
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| Utilizador | TYGLS (UID 94774) |
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| Submissão | 01/06/2026 04h50 (há 4 meses) |
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| Moderação | 28/06/2026 20h47 (28 days later) |
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| Estado | Aceite |
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| Entrada VulDB | 374581 [llvm llvm-project até 22.1.6 ValueSymbolTable ValueSymbolTable.cpp llvm::StringMap::insert Excesso de tampão] |
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| Pontos | 20 |
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