Vulnerability in Pq-Crystals Kyber
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.007 (51.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
References
- pqshield.com/pqshield-plugs-timing-leaks-in-kyber-ml-kem-to-improve-pqc-impleme… (Exploit, Third Party Advisory)
- github.com/antoonpurnal/clangover (Exploit)
- github.com/pq-crystals/kyber/commit/9b8d30698a3e7449aeb34e62339d4176f11e3c6c (Patch)
- news.ycombinator.com/item (Not Applicable)
- twitter.com/purnaltoon/status/1797644696568959476 (Exploit)
Frequently asked questions
- What is CVE-2024-37880?
- CVE-2024-37880 is a high-severity vulnerability in Pq-Crystals Kyber, classified under Observable Discrepancy. CVSS score: 7.5/10. Published 2024-06-10.
- How severe is CVE-2024-37880?
- High severity. CVSS v3 base score is 7.5 out of 10.