Botan before 3.6.0, when certain LLVM versions are used, has compiler-induced secret-dependent control flow in lib/utils/ghash/ghash.cpp in GHASH in AES-GCM. There is a branch instead of an XOR with carry. This was observed for Clang in LLVM 15 on RISC-V.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade botan | May 15, 2025 | Oct 23, 2024 |
| Ubuntu | — | Upgrade libbotan-2-devUpgrade botanUpgrade libbotan-2-19 (Ubuntu Pro)Upgrade python3-botanUpgrade python3-botan (Ubuntu Pro)Upgrade libbotan-2-dev (Ubuntu Pro)Upgrade libbotan-2-19Upgrade botan (Ubuntu Pro) | Jun 26, 2025 | Oct 23, 2024 |
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