CVE-2024-37880

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.

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.70% chance of exploitation in the next 30 days, 52nd percentile

Published

2024-06-10

Updated

2024-08-02

Proof-of-concept exploits (1)

• https://pqshield.com/pqshield-plugs-timing-leaks-in-kyber-ml-kem-to-improve-pqc-implement…

Security advisories

• https://pqshield.com/pqshield-plugs-timing-leaks-in-kyber-ml-kem-to-improve-pqc-implement…
• pq-crystals/kyber/commit/9b8d30698a3e7449aeb34e62339d4176f11e3c6c

References

• CVE Record
• NVD entry