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Fencer Intel
high 7.1

CVE-2024-56721 json

x86/CPU/AMD: Terminate the erratum_1386_microcode array

published last yr. modified 3mo ago also EUVD-2024-53369

cvss
7.1
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 13%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

x86/CPU/AMD: Terminate the erratum_1386_microcode array

The erratum_1386_microcode array requires an empty entry at the end. Otherwise x86_match_cpu_with_stepping() will continue iterate the array after it ended.

Add an empty entry to erratum_1386_microcode to its end.

Patch / fix

  • Linux Linux 6.11.11, 6.12.2, 6.13
  • linux Debian 14, Debian 13 6.12.3-1

debian advisories DEBIAN-CVE-2024-56721

  • linux Ubuntu 22.04 LTS 5.15.0-140.150
  • linux Ubuntu 24.04 LTS 6.8.0-58.60
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1084.91
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1027.29
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1083.92
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1028.30
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1081.87
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1023.27

ubuntu advisories UBUNTU-CVE-2024-56721

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 10.0 6.12.0-55.27.1.el10_0
  • rv RHEL 10.0 6.12.0-55.27.1.el10_0
  • perf RHEL 10.0 6.12.0-55.27.1.el10_0
  • rtla RHEL 10.0 6.12.0-55.27.1.el10_0
  • libperf RHEL 10.0 6.12.0-55.27.1.el10_0
  • kernel-rt RHEL 10.0 6.12.0-55.27.1.el10_0
  • kernel-64k RHEL 10.0 6.12.0-55.27.1.el10_0
  • kernel-core RHEL 10.0 6.12.0-55.27.1.el10_0

red hat advisories RHSA-2025:13598

  • kernel-rt Real Time Module 15 SP7 6.4.0-150700.7.31.2
  • kernel-syms-rt Real Time Module 15 SP7 6.4.0-150700.7.31.1
  • kernel-source-rt Real Time Module 15 SP7 6.4.0-150700.7.31.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.27.1
  • kernel-syms-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.27.1
  • kernel-source-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.27.1
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.31.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.31.1

suse advisories SUSE-SU-2026:0587-1SUSE-SU-2026:0472-1SUSE-SU-2026:0447-1

  • kernel Rocky Linux 10 6.12.0-55.27.1.el10_0

rocky linux advisories RLSA-2025:13598

Is CVE-2024-56721 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.

Check with Fencer

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-2024-56721 updated cvss 6.0

kernel: x86/CPU/AMD: Terminate the erratum_1386_microcode array

  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-55.27.1.el10_0, perf 6.12.0-55.27.1.el10_0, rtla 6.12.0-55.27.1.el10_0, python3-perf 6.12.0-55.27.1.el10_0, kernel-devel-matched 6.12.0-55.27.1.el10_0, kernel-64k-devel-matched 6.12.0-55.27.1.el10_0, +7 more Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-55.27.1.el10_0, kernel-64k 6.12.0-55.27.1.el10_0, kernel-core 6.12.0-55.27.1.el10_0, kernel-tools 6.12.0-55.27.1.el10_0, kernel-modules 6.12.0-55.27.1.el10_0, kernel-64k-core 6.12.0-55.27.1.el10_0, +27 more Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-55.27.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.27.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.27.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.27.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.27.1.el10_0 Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-55.27.1.el10_0, kernel-rt-64k 6.12.0-55.27.1.el10_0, kernel-rt-core 6.12.0-55.27.1.el10_0, kernel-rt-modules 6.12.0-55.27.1.el10_0, kernel-rt-64k-core 6.12.0-55.27.1.el10_0, kernel-rt-debug-core 6.12.0-55.27.1.el10_0, +14 more Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-55.27.1.el10_0, kernel-rt-kvm 6.12.0-55.27.1.el10_0, kernel-rt-core 6.12.0-55.27.1.el10_0, kernel-rt-modules 6.12.0-55.27.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.27.1.el10_0, kernel-rt-debug-core 6.12.0-55.27.1.el10_0, +6 more
    fixed: vendor fix RHSA-2025:13598
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    not affected: vulnerable code not present

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
last yr.

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CISA ADP 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
NVD 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

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.