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Fencer Vulns
medium 6.5

CVE-2021-26341 json

Some AMD CPUs may transiently execute beyond unconditional direct branches, which may potentially result in data leakage.

published 2022-03-11 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13147

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits
0
none known

Summary

Some AMD CPUs may transiently execute beyond unconditional direct branches, which may potentially result in data leakage.

Patch / fix

  • kernel RHEL 9 5.14.0-284.11.1.el9_2
  • perf RHEL 9 5.14.0-284.11.1.el9_2
  • rtla RHEL 9 5.14.0-284.11.1.el9_2
  • bpftool RHEL 9 7.0.0-284.11.1.el9_2
  • kernel-64k RHEL 9 5.14.0-284.11.1.el9_2
  • kernel-core RHEL 9 5.14.0-284.11.1.el9_2
  • kernel-tools RHEL 9 5.14.0-284.11.1.el9_2
  • python3-perf RHEL 9 5.14.0-284.11.1.el9_2

red hat advisories RHSA-2023:2458RHSA-2023:2148RHSA-2024:1877RHSA-2023:2736RHSA-2023:2951

  • kernel-syms SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +6 more 5.3.18-150200.24.126.1
  • kernel-source SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +6 more 5.3.18-150200.24.126.1
  • kernel-default SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +8 more 5.3.18-150200.24.126.1
  • kernel-preempt SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +6 more 5.3.18-150200.24.126.1
  • kernel-obs-build SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +3 more 5.3.18-150200.24.126.1
  • kernel-default-base SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +6 more 5.3.18-150200.24.126.1.150200.9.59.2
  • kernel-syms SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.12.14-95.105.1
  • kernel-source SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.12.14-95.105.1

suse advisories SUSE-SU-2023:0416-1SUSE-SU-2022:2809-1SUSE-SU-2022:2808-1SUSE-SU-2022:2723-1SUSE-SU-2022:2629-1SUSE-SU-2022:2615-1

  • kernel-default openSUSE Leap Micro 5.2 5.3.18-150300.59.87.1
  • kernel-default-base openSUSE Leap Micro 5.2 5.3.18-150300.59.87.1.150300.18.50.2

opensuse advisories openSUSE-SU-2022:2549-1

  • kernel-rt AlmaLinux 8 4.18.0-477.10.1.rt7.274.el8_8
  • kernel-rt-kvm AlmaLinux 8 4.18.0-477.10.1.rt7.274.el8_8
  • kernel-rt-core AlmaLinux 8 4.18.0-477.10.1.rt7.274.el8_8
  • kernel-rt-modules AlmaLinux 8 4.18.0-477.10.1.rt7.274.el8_8
  • kernel-rt-debug-kvm AlmaLinux 8 4.18.0-477.10.1.rt7.274.el8_8
  • kernel-rt-debug-core AlmaLinux 8 4.18.0-477.10.1.rt7.274.el8_8
  • kernel-rt-debug-modules AlmaLinux 8 4.18.0-477.10.1.rt7.274.el8_8
  • kernel-rt-modules-extra AlmaLinux 8 4.18.0-477.10.1.rt7.274.el8_8

almalinux advisories ALSA-2023:2736ALSA-2023:2951ALSA-2023:2148ALSA-2023:2458

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-2021-26341 updated cvss 4.7

hw: cpu: AMD CPUs may transiently execute beyond unconditional direct branch

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder EUS (v.8.6) kernel-debuginfo-common-x86_64 4.18.0-372.100.1.el8_6, kernel-debuginfo-common-aarch64 4.18.0-372.100.1.el8_6, kernel-debuginfo-common-ppc64le 4.18.0-372.100.1.el8_6
    fixed: vendor fix RHSA-2024:1877
  • Red Hat Enterprise Linux AppStream (v. 9) perf 5.14.0-284.11.1.el9_2, rtla 5.14.0-284.11.1.el9_2, kernel-devel-matched 5.14.0-284.11.1.el9_2, kernel-64k-devel-matched 5.14.0-284.11.1.el9_2, kernel-debug-devel-matched 5.14.0-284.11.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.11.1.el9_2, +5 more
    fixed: vendor fix RHSA-2023:2458
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-477.10.1.el8_8, kernel 4.18.0-477.10.1.el8_8, bpftool 4.18.0-477.10.1.el8_8, kernel-core 4.18.0-477.10.1.el8_8, kernel-tools 4.18.0-477.10.1.el8_8, python3-perf 4.18.0-477.10.1.el8_8, +15 more
    fixed: vendor fix RHSA-2023:2951
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.0.0-284.11.1.el9_2, kernel 5.14.0-284.11.1.el9_2, kernel-64k 5.14.0-284.11.1.el9_2, kernel-core 5.14.0-284.11.1.el9_2, kernel-tools 5.14.0-284.11.1.el9_2, python3-perf 5.14.0-284.11.1.el9_2, +28 more
    fixed: vendor fix RHSA-2023:2458
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) perf 4.18.0-372.100.1.el8_6, kernel 4.18.0-372.100.1.el8_6, bpftool 4.18.0-372.100.1.el8_6, kernel-core 4.18.0-372.100.1.el8_6, kernel-tools 4.18.0-372.100.1.el8_6, python3-perf 4.18.0-372.100.1.el8_6, +15 more
    fixed: vendor fix RHSA-2024:1877
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-477.10.1.el8_8, kernel-debuginfo-common-aarch64 4.18.0-477.10.1.el8_8, kernel-debuginfo-common-ppc64le 4.18.0-477.10.1.el8_8
    fixed: vendor fix RHSA-2023:2951
show 6 more
  • Red Hat Enterprise Linux CRB (v. 9) kernel-debuginfo-common-s390x 5.14.0-284.11.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.11.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.11.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.11.1.el9_2
    fixed: vendor fix RHSA-2023:2458
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-477.10.1.rt7.274.el8_8, kernel-rt-kvm 4.18.0-477.10.1.rt7.274.el8_8, kernel-rt-core 4.18.0-477.10.1.rt7.274.el8_8, kernel-rt-modules 4.18.0-477.10.1.rt7.274.el8_8, kernel-rt-debug-kvm 4.18.0-477.10.1.rt7.274.el8_8, kernel-rt-debug-core 4.18.0-477.10.1.rt7.274.el8_8, +4 more
    fixed: vendor fix RHSA-2023:2736
  • Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-kvm 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-core 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-modules 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-debug-kvm 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-debug-core 5.14.0-284.11.1.rt14.296.el9_2, +6 more
    fixed: vendor fix RHSA-2023:2148
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-477.10.1.rt7.274.el8_8, kernel-rt-core 4.18.0-477.10.1.rt7.274.el8_8, kernel-rt-modules 4.18.0-477.10.1.rt7.274.el8_8, kernel-rt-debug-core 4.18.0-477.10.1.rt7.274.el8_8, kernel-rt-debug-modules 4.18.0-477.10.1.rt7.274.el8_8, kernel-rt-modules-extra 4.18.0-477.10.1.rt7.274.el8_8, +2 more
    fixed: vendor fix RHSA-2023:2736
  • Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-core 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-modules 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-debug-core 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-modules-core 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-debug-modules 5.14.0-284.11.1.rt14.296.el9_2, +4 more
    fixed: vendor fix RHSA-2023:2148
  • Red Hat Virtualization 4 Hypervisor for RHEL 8 perf 4.18.0-372.100.1.el8_6, kernel-debuginfo-common-x86_64 4.18.0-372.100.1.el8_6
    fixed: vendor fix RHSA-2024:1877

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

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • AMD AMD Processors

Classification

Weakness
  • CWE-212 Improper Removal of Sensitive Information Before Storage or Transfer

References

Sources

Fencer Vulns 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.