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Fencer Intel
medium 4.9

CVE-2025-54771 json

Grub2: use-after-free in grub_file_close()

published 11mo ago modified 4d ago also EUVD-2025-198082

cvss
4.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

A use-after-free vulnerability has been identified in the GNU GRUB (Grand Unified Bootloader). The flaw occurs because the file-closing process incorrectly retains a memory pointer, leaving an invalid reference to a file system structure. An attacker could exploit this vulnerability to cause grub to crash, leading to a Denial of Service. Possible data integrity or confidentiality compromise is not discarded.

Patch / fix

  • grub2 Debian 14 2.14-1

debian advisories DEBIAN-CVE-2025-54771

  • grub2 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 2.12-160000.3.1
  • grub2 SLE Module for Server Applications 15 SP7, SLE Module for Basesystem 15 SP7 2.12-150700.19.19.1
  • grub2 SLE Micro 5.4, SLE Micro 5.3 2.06-150400.11.66.1
  • grub2 SLE Module for Server Applications 15 SP6, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 2.12-150600.8.44.2
  • grub2 Linux Micro 6.1 2.12-slfo.1.1_3.1
  • grub2 SLE Micro 5.5 2.06-150500.29.59.1
  • grub2 SLE Micro 5.2 2.04-150300.22.61.1
  • grub2 SLES LTSS Extended Security 12 SP5 2.02-193.1

suse advisories SUSE-SU-2025:21212-1SUSE-SU-2025:21223-1SUSE-SU-2025:4305-1SUSE-SU-2025:4224-1SUSE-SU-2025:4197-1SUSE-SU-2025:4196-1

  • grub2 openSUSE Leap 16.0 2.12-160000.3.1
  • grub2 openSUSE Tumbleweed 2.12-67.1

opensuse advisories openSUSE-SU-2025:20163-1openSUSE-SU-2025:15749-1

Is CVE-2025-54771 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-54771 updated cvss 4.9

grub2: Use-after-free in grub_file_close()

  • Red Hat Enterprise Linux 7 grub2, grub2-pc, grub2-efi, grub2-ppc64, grub2-tools, grub2-common, +15 more Red Hat Enterprise Linux 8 grub2, grub2-pc, grub2-tools, grub2-common, grub2-efi-x64, grub2-ppc64le, +13 more Red Hat Enterprise Linux 9 grub2, grub2-pc, grub2-tools, grub2-common, grub2-efi-x64, grub2-ppc64le, +10 more Red Hat Enterprise Linux 10 grub2 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “There's no known mitigation available for this vulnerability.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
11mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 4.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

  • GNU grub2
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness
  • CWE-825 Expired Pointer Dereference

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.