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LLVM Assembler Crashes When Handling Certain Invalid Assembly Code
published 6 years ago
Summary
A bug in the LLVM assembler can cause the program to crash when it encounters certain types of invalid assembly code. This can lead to data loss or system instability. To protect your system, update your LLVM installation to the latest version or patch.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| OSS-Fuzz | – | keystone | All versions |
Original advisory text
Use-of-uninitialized-value in llvm_ks::MCAssembler::computeFragmentSize
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22482
```
Crash type: Use-of-uninitialized-value
Crash state:
llvm_ks::MCAssembler::computeFragmentSize
llvm_ks::MCAsmLayout::layoutFragment
llvm_ks::MCAsmLayout::ensureValid
```
```
Crash type: Use-of-uninitialized-value
Crash state:
llvm_ks::MCAssembler::computeFragmentSize
llvm_ks::MCAsmLayout::layoutFragment
llvm_ks::MCAsmLayout::ensureValid
```
References
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22482 Third Party Advisory
Timeline
Published14 Jul 2020
Updated11 Mar 2026
First seen6 Mar 2026
Sources
OSV-2020-853 · OSV
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