CVE-2024-56738

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

CVE-2024-56738 is fixed in grub2 on 1 platform, first by SUSE-SU-2025:02772-1, released August 12, 2025. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.7

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0041

35th percentile

This update for grub2 fixes the following issues: - CVE-2024-56738: Fixed side-channel attack due to not constant-time algorithm in grub_crypto_memcmp (bsc#1234959) Other fixes: - Fix test -f and -s do not work properly over the network files served via tftp and http (bsc#1246157, bsc#1246237) - Skip mount point in grub_find_device function (bsc#1246231)

Where it's fixed

Product	Fixed in	Fix	Released
Linux
grub2 · opensuse-leap 15.6	2.12-150600.8.34.1	SUSE-SU-2025:02772-1	Aug 12, 2025
grub2 · opensuse-leap 16.0	2.12-160000.3.1	OPENSUSE-SU-2025:20163-1	Dec 15, 2025
grub2 · sles 15.6	2.12-150600.8.34.1	SUSE-SU-2025:02772-1	Aug 12, 2025
grub2 · sles 15.7	2.12-150700.19.13.2	SUSE-SU-2025:02813-1	Aug 15, 2025
grub2 · sles 16.0	2.12-160000.3.1	SUSE-SU-2025:21212-1	Dec 15, 2025

Details

Published
August 12, 2025
Weakness
Observable Timing Discrepancy
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-56738

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