PT-2024-37048 · Gnu Grub+2 · Gnu Grub+2

Jbo + 1 · Published 2024-12-27 · Updated 2026-01-02 · CVE-2024-56738

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions GNU GRUB (aka GRUB2) versions 2.12 and earlier

Description The issue is related to the use of a non-constant time algorithm for grub crypto memcmp, which allows side-channel attacks. This means that an attacker could potentially exploit the difference in time it takes for the comparison to occur, gaining unauthorized access to sensitive information.

Recommendations For GNU GRUB (aka GRUB2) versions 2.12 and earlier, consider updating to a version that utilizes a constant-time algorithm for grub crypto memcmp to prevent side-channel attacks. As a temporary workaround, restrict access to sensitive information that could be exploited through side-channel attacks until a patch is available.

Fix

Side Channel Attack

Weakness Enumeration

CWE-203

CWE-208

Related Identifiers

AZL-54692

AZL-54709

BDU:2026-05547

CVE-2024-56738

OESA-2025-1675

OPENSUSE-SU-2025:15400-1

OPENSUSE-SU-2025:20163-1

SUSE-SU-2025:02705-1

SUSE-SU-2025:02706-1

SUSE-SU-2025:02724-1

SUSE-SU-2025:02725-1

SUSE-SU-2025:02727-1

SUSE-SU-2025:02772-1

SUSE-SU-2025:02813-1

SUSE-SU-2025:20654-1

SUSE-SU-2025:20863-1

SUSE-SU-2025:21212-1

SUSE-SU-2025:21223-1

SUSE-SU-2025_02725-1

SUSE-SU-2025_02772-1

SUSE-SU-2025_02813-1

Affected Products

Debian

Gnu Grub

Suse

References · 125

• https://osv.dev/vulnerability/SUSE-SU-2025:02705-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-56738 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2024-56738 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2024-56738 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2025:15400-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:02725-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:02727-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:20654-1 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2025-1675 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2024-56738 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2025:02813-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-05547 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2025:20163-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:02772-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:20863-1 · Vendor Advisory