CVE-2024-56738
CSIRTS triage
- What
- The grub_crypto_memcmp function uses a non-constant-time algorithm enabling timing side-channel attacks to leak cryptographic secrets.
- Who is affected
- GRUB installations using cryptographic verification with versions through 2.12.
- Urgency
- Medium severity (CVSS 6.7); side-channel attacks require local access and multiple samples but can compromise GRUB security.
- Action
- Update GRUB to a version after 2.12 with constant-time comparison implementation.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.
Advisory coverage (1)
External references
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[](https://www.csirts.com/cve/CVE-2024-56738)