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TI-2024-37621 Aliases CVE-2024-56738GHSA-9gmj-v2m8-qffv

Observable discrepancy in GNU GRUB2

Priority LOW 24CWE-208Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Deferred Red Hat: fix deferred

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-208.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00405 34th percentileScored 2026-11-07
Fix Deferred Red Hat: fix deferred

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
GNUGRUB22.00 – 2.12—No fix listedCNA
  • GRUB2 VendorGNU Affected 2.00 – 2.12 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*up to 2.12VulnerableGNU
  • cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:* Versions up to 2.12 Vulnerable ·GNU

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 8AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 9AffectedNo fix planned: Will not fix
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-56738
  2. 2026-10-03 Alias added: GHSA-9gmj-v2m8-qffv
  3. 2026-10-21 Affected versions changed · Red Hat
  4. 2026-10-22 Affected versions changed · Red Hat

References

Advisory 1

  • TI-2023-04324 Grub2: out-of-bounds write at fs/ntfs.c may lead to unsigned code execution CVSS 3.1HIGH 7.8
  • TI-2015-06891 Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate… CVSS 3.1HIGH 7.4
  • TI-2024-37620 Heap-based buffer overflow in GNU GRUB2 CVSS 3.1HIGH 8.8
  • TI-2022-11367 Integer underflow in GNU GRUB CVSS 3.1HIGH 8.1
  • TI-2022-02403 Heap-based buffer overflow in grub2 CVSS 3.1HIGH 8.6
  • TI-2020-08612 Buffer overflow in Grub CVSS 3.1HIGH 8.2
See all 47 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences