CVE-2024-37880

HIGH

Pq-crystals Kyber < 2024-06-03 - Information Disclosure

Title source: rule

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.

References (5)

[Exploit] https://github.com/antoonpurnal/clangover

View Exploit ZIP pw:eip

[Patch] https://github.com/pq-crystals/kyber/commit/9b8d30698a3e7449aeb34e62339d4176f11e3c6c

View Patch ZIP pw:eip

[Not Applicable] https://news.ycombinator.com/item?id=40577486

[Exploit, Third Party Advisory] https://pqshield.com/pqshield-plugs-timing-leaks-in-kyber-ml-kem-to-improve-pqc-implementation-maturity/

[Exploit] https://twitter.com/purnaltoon/status/1797644696568959476

Scores

CVSS v3 7.5

EPSS 0.0014

EPSS Percentile 33.8%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

CWE

CWE-203

Status published

Products (1)

pq-crystals/kyber < 2024-06-03

Published Jun 10, 2024

Tracked Since Feb 18, 2026