CVEvulnerability
CVE-2024-37880
7.5 HIGH
Official page ↗
- Status
- Modified
- Published
- 2024-06-10
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-203
Description
The Kyber reference implementation before 9b8d306, when compiled by LLVM Clang through 18.x with some common optimization options, has a timing side channel that allows attackers to recover an ML-KEM 512 secret key in minutes. This occurs because poly_frommsg in poly.c does not prevent Clang from emitting a vulnerable secret-dependent branch.
Affected configurations
• pq-crystals kyber (< 2024-06-03)
Related
Weakness · CWE (1)
- CWE-203 Observable Discrepancy weakness
References
- https://github.com/antoonpurnal/clangover Exploit
- https://github.com/pq-crystals/kyber/commit/9b8d30698a3e7449aeb34e62339d4176f11e3c6c Patch
- https://news.ycombinator.com/item?id=40577486 Not Applicable
- https://pqshield.com/pqshield-plugs-timing-leaks-in-kyber-ml-kem-to-improve-pqc-implementation-maturity/ Exploit, Third Party Advisory
- https://twitter.com/purnaltoon/status/1797644696568959476 Exploit
- https://github.com/antoonpurnal/clangover Exploit
- https://github.com/pq-crystals/kyber/commit/9b8d30698a3e7449aeb34e62339d4176f11e3c6c Patch
- https://news.ycombinator.com/item?id=40577486 Not Applicable
- https://pqshield.com/pqshield-plugs-timing-leaks-in-kyber-ml-kem-to-improve-pqc-implementation-maturity/ Exploit, Third Party Advisory
- https://twitter.com/purnaltoon/status/1797644696568959476 Exploit