CVE-2024-56738

MEDIUMNVD 5.35.3—

5.3

GNU GRUB (aka GRUB2) through 2.12 does not use a constant-time algorithm for grub_crypto_memcmp and thus allows side-channel attacks.

CVSS v3: 5.3
EG Score: 5.3(medium)
EPSS: 11.7%
KEV: Not listed

Published

December 29, 2024

Last Modified

June 24, 2025

References (1)

cve@mitrehttps://savannah.gnu.org/bugs/?66603

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:12 UTCepss_batch
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2026-06-01 13:51 UTCepss_batch
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2026-05-29 13:43 UTCepss_batch
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2026-05-26 07:18 UTCepss_batch
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Frequently asked(5)

What is CVE-2024-56738?

CVE-2024-56738 is a medium vulnerability published on December 29, 2024. GNU GRUB (aka GRUB2) through 2.12 does not use a constant-time algorithm for grubcryptomemcmp and thus allows side-channel attacks.

When was CVE-2024-56738 disclosed?

CVE-2024-56738 was first published in the National Vulnerability Database on December 29, 2024, with the most recent update on June 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2024-56738 actively exploited?

CVE-2024-56738 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2024-56738?

CVE-2024-56738 has a CVSS v3 base score of 5.3 (NVD).

How do I remediate CVE-2024-56738?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-56738, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2024-56738

📅 Published

🔄 Last Modified

🔗 References (1)

Weakness Classification(2)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2024-56738?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (1)

Frequently asked(5)

Related CVEs(same CWE)