Skip to content
Fencer Vulns
high 7.8

CVE-2025-39964 kev in the critical feed json

crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

published 2025-10-13 12 mo ago modified 2026-10-19 20 d ago also EUVD-2025-34068

cvss
7.8
version 3.1, CNA
cisa kev
Exploited
added 2026-09-18
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

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

crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencies in the internal socket state.

Disallow this by adding a new ctx->write field that indiciates exclusive ownership for writing.

Patch / fix

cisa required action Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

  • Linux Linux 5.10.245, 5.15.194, 6.1.154, 6.6.108, 6.12.49, 6.16.9, 6.17
  • linux Debian 12 6.1.158-1
  • linux Debian 13 6.12.57-1
  • linux Debian 14 6.16.9-1

debian advisories DEBIAN-CVE-2025-39964

  • linux Ubuntu 22.04 LTS 5.15.0-164.174
  • linux Ubuntu 24.04 LTS 6.8.0-90.91
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1098.105
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1044.46
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1098.107
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1045.48
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1094.100
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1041.46

ubuntu advisories UBUNTU-CVE-2025-39964

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 enterprise linux nvidia 10 6.12.0-259.27.el10nv
  • rv enterprise linux nvidia 10 6.12.0-259.27.el10nv
  • perf enterprise linux nvidia 10 6.12.0-259.27.el10nv
  • rtla enterprise linux nvidia 10 6.12.0-259.27.el10nv
  • libperf enterprise linux nvidia 10 6.12.0-259.27.el10nv
  • kernel-64k enterprise linux nvidia 10 6.12.0-259.27.el10nv
  • kernel-core enterprise linux nvidia 10 6.12.0-259.27.el10nv
  • kernel-tools enterprise linux nvidia 10 6.12.0-259.27.el10nv

red hat advisories RHSA-2026:73788RHSA-2026:72059RHSA-2026:71687RHSA-2026:71657RHSA-2026:71606RHSA-2026:71601

  • kernel-64kb SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS, SLE High Performance Computing 15 SP4-ESPOS 5.14.21-150400.24.243.1
  • kernel-syms SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 5.14.21-150400.24.243.1
  • kernel-source SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 5.14.21-150400.24.243.1
  • kernel-default SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +5 more 5.14.21-150400.24.243.1
  • kernel-obs-build SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 5.14.21-150400.24.243.1
  • kernel-default-base SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 5.14.21-150400.24.243.1.150400.24.122.1
  • kernel-64kb SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS, SLE High Performance Computing 15 SP5-ESPOS 5.14.21-150500.55.192.2
  • kernel-syms SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.192.1

suse advisories SUSE-SU-2026:4668-1SUSE-SU-2026:4667-1SUSE-SU-2026:4666-1SUSE-SU-2026:4665-1SUSE-SU-2026:4282-1SUSE-SU-2026:4120-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.37.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.37.1

opensuse advisories openSUSE-SU-2026:21555-1openSUSE-SU-2026:20416-1

  • rv AlmaLinux 10 6.12.0-211.58.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.58.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.58.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.58.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.58.1.el10_2
  • kernel-tools AlmaLinux 10 6.12.0-211.58.1.el10_2
  • python3-perf AlmaLinux 10 6.12.0-211.58.1.el10_2
  • kernel-rt-64k AlmaLinux 10 6.12.0-211.58.1.el10_2

almalinux advisories ALSA-2026:70498ALSA-2026:70402ALSA-2026:70403ALSA-2026:70459

  • kernel Rocky Linux 9 5.14.0-687.50.1.el9_8
  • kernel Rocky Linux 10 6.12.0-211.58.1.el10_2
  • kernel-rt Rocky Linux 8 4.18.0-553.166.1.rt7.507.el8_10
  • kernel Rocky Linux 8 4.18.0-553.166.1.el8_10

rocky linux advisories RLSA-2026:70459RLSA-2026:70498RLSA-2026:70403RLSA-2026:70402

  • kernel Azure Linux 3.0 6.6.112.1-1
  • kernel CBL-Mariner 2.0 5.15.200.1-1

azure linux advisories AZL-68460AZL-76437

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2025-39964 updated cvss 7.3

kernel: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

  • Red Hat NVIDIA for RHEL 10 rv 6.12.0-231.20.el10nv, rv 6.12.0-259.27.el10nv, perf 6.12.0-231.20.el10nv, perf 6.12.0-259.27.el10nv, rtla 6.12.0-231.20.el10nv, rtla 6.12.0-259.27.el10nv, +62 more
    fixed: vendor fix RHSA-2026:72059
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.143.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.143.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.143.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.143.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.143.1.el9_6
    fixed: vendor fix RHSA-2026:71327
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.50.1.el9_8, perf 5.14.0-687.50.1.el9_8, rtla 5.14.0-687.50.1.el9_8, python3-perf 5.14.0-687.50.1.el9_8, kernel-devel-matched 5.14.0-687.50.1.el9_8, kernel-64k-devel-matched 5.14.0-687.50.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:70459
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.58.1.el10_2, perf 6.12.0-211.58.1.el10_2, rtla 6.12.0-211.58.1.el10_2, python3-perf 6.12.0-211.58.1.el10_2, kernel-devel-matched 6.12.0-211.58.1.el10_2, kernel-64k-devel-matched 6.12.0-211.58.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:70498
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.194.1.el9_2, rtla 5.14.0-284.194.1.el9_2, kernel-devel-matched 5.14.0-284.194.1.el9_2, kernel-64k-devel-matched 5.14.0-284.194.1.el9_2, kernel-debug-devel-matched 5.14.0-284.194.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.194.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:71601
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) rv 5.14.0-427.152.1.el9_4, perf 5.14.0-427.152.1.el9_4, rtla 5.14.0-427.152.1.el9_4, kernel-devel-matched 5.14.0-427.152.1.el9_4, kernel-64k-devel-matched 5.14.0-427.152.1.el9_4, kernel-debug-devel-matched 5.14.0-427.152.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:71569
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.106.1.el10_0, perf 6.12.0-55.106.1.el10_0, rtla 6.12.0-55.106.1.el10_0, python3-perf 6.12.0-55.106.1.el10_0, kernel-devel-matched 6.12.0-55.106.1.el10_0, kernel-64k-devel-matched 6.12.0-55.106.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:71326
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.143.1.el9_6, perf 5.14.0-570.143.1.el9_6, rtla 5.14.0-570.143.1.el9_6, python3-perf 5.14.0-570.143.1.el9_6, kernel-devel-matched 5.14.0-570.143.1.el9_6, kernel-64k-devel-matched 5.14.0-570.143.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:71327
show 32 more
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.166.1.el8_10, kernel 4.18.0-553.166.1.el8_10, bpftool 4.18.0-553.166.1.el8_10, kernel-core 4.18.0-553.166.1.el8_10, kernel-tools 4.18.0-553.166.1.el8_10, python3-perf 4.18.0-553.166.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:70402
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.50.1.el9_8, kernel-64k 5.14.0-687.50.1.el9_8, kernel-core 5.14.0-687.50.1.el9_8, kernel-tools 5.14.0-687.50.1.el9_8, kernel-modules 5.14.0-687.50.1.el9_8, kernel-64k-core 5.14.0-687.50.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:70459
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.58.1.el10_2, kernel-64k 6.12.0-211.58.1.el10_2, kernel-core 6.12.0-211.58.1.el10_2, kernel-tools 6.12.0-211.58.1.el10_2, kernel-modules 6.12.0-211.58.1.el10_2, kernel-64k-core 6.12.0-211.58.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:70498
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.209.1.el8_4, kernel 4.18.0-305.209.1.el8_4, bpftool 4.18.0-305.209.1.el8_4, kernel-core 4.18.0-305.209.1.el8_4, kernel-tools 4.18.0-305.209.1.el8_4, python3-perf 4.18.0-305.209.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:71565
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.218.1.el8_6, kernel 4.18.0-372.218.1.el8_6, bpftool 4.18.0-372.218.1.el8_6, kernel-core 4.18.0-372.218.1.el8_6, kernel-tools 4.18.0-372.218.1.el8_6, python3-perf 4.18.0-372.218.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:71592
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.170.1.el8_8, kernel 4.18.0-477.170.1.el8_8, bpftool 4.18.0-477.170.1.el8_8, kernel-core 4.18.0-477.170.1.el8_8, kernel-tools 4.18.0-477.170.1.el8_8, python3-perf 4.18.0-477.170.1.el8_8, +9 more
    fixed: vendor fix RHSA-2026:71594
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.194.1.el9_2, kernel 5.14.0-284.194.1.el9_2, kernel-64k 5.14.0-284.194.1.el9_2, kernel-core 5.14.0-284.194.1.el9_2, kernel-tools 5.14.0-284.194.1.el9_2, python3-perf 5.14.0-284.194.1.el9_2, +28 more
    fixed: vendor fix RHSA-2026:71601
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool 7.3.0-427.152.1.el9_4, kernel 5.14.0-427.152.1.el9_4, kernel-64k 5.14.0-427.152.1.el9_4, kernel-core 5.14.0-427.152.1.el9_4, kernel-tools 5.14.0-427.152.1.el9_4, python3-perf 5.14.0-427.152.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:71569
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.106.1.el10_0, kernel-64k 6.12.0-55.106.1.el10_0, kernel-core 6.12.0-55.106.1.el10_0, kernel-tools 6.12.0-55.106.1.el10_0, kernel-modules 6.12.0-55.106.1.el10_0, kernel-64k-core 6.12.0-55.106.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:71326
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.143.1.el9_6, kernel-64k 5.14.0-570.143.1.el9_6, kernel-core 5.14.0-570.143.1.el9_6, kernel-tools 5.14.0-570.143.1.el9_6, kernel-modules 5.14.0-570.143.1.el9_6, kernel-64k-core 5.14.0-570.143.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:71327
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.209.1.el8_4, kernel 4.18.0-305.209.1.el8_4, bpftool 4.18.0-305.209.1.el8_4, kernel-core 4.18.0-305.209.1.el8_4, kernel-tools 4.18.0-305.209.1.el8_4, python3-perf 4.18.0-305.209.1.el8_4, +15 more
    fixed: vendor fix RHSA-2026:71565
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) perf 4.18.0-372.218.1.el8_6, kernel 4.18.0-372.218.1.el8_6, bpftool 4.18.0-372.218.1.el8_6, kernel-core 4.18.0-372.218.1.el8_6, kernel-tools 4.18.0-372.218.1.el8_6, python3-perf 4.18.0-372.218.1.el8_6, +15 more
    fixed: vendor fix RHSA-2026:71592
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.170.1.el8_8, kernel 4.18.0-477.170.1.el8_8, bpftool 4.18.0-477.170.1.el8_8, kernel-core 4.18.0-477.170.1.el8_8, kernel-tools 4.18.0-477.170.1.el8_8, python3-perf 4.18.0-477.170.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:71594
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.50.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.50.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.50.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.50.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.50.1.el9_8
    fixed: vendor fix RHSA-2026:70459
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.58.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.58.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.58.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.58.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.58.1.el10_2
    fixed: vendor fix RHSA-2026:70498
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.106.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.106.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.106.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.106.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.106.1.el10_0
    fixed: vendor fix RHSA-2026:71326
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.166.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.166.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.166.1.el8_10
    fixed: vendor fix RHSA-2026:70402
  • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt 3.10.0-1160.164.1.rt56.1316.el7, kernel-rt-trace 3.10.0-1160.164.1.rt56.1316.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.164.1.rt56.1316.el7
    fixed: vendor fix RHSA-2026:71657
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-kvm 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-core 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-modules 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-debug-kvm 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-debug-core 4.18.0-553.166.1.rt7.507.el8_10, +4 more
    fixed: vendor fix RHSA-2026:70403
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.50.1.el9_8, kernel-rt-64k 5.14.0-687.50.1.el9_8, kernel-rt-core 5.14.0-687.50.1.el9_8, kernel-rt-modules 5.14.0-687.50.1.el9_8, kernel-rt-64k-core 5.14.0-687.50.1.el9_8, kernel-rt-debug-core 5.14.0-687.50.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:70459
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.58.1.el10_2, kernel-rt-64k 6.12.0-211.58.1.el10_2, kernel-rt-core 6.12.0-211.58.1.el10_2, kernel-rt-modules 6.12.0-211.58.1.el10_2, kernel-rt-64k-core 6.12.0-211.58.1.el10_2, kernel-rt-debug-core 6.12.0-211.58.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:70498
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.194.1.rt14.479.el9_2, kernel-rt-core 5.14.0-284.194.1.rt14.479.el9_2, kernel-rt-modules 5.14.0-284.194.1.rt14.479.el9_2, kernel-rt-debug-core 5.14.0-284.194.1.rt14.479.el9_2, kernel-rt-modules-core 5.14.0-284.194.1.rt14.479.el9_2, kernel-rt-debug-modules 5.14.0-284.194.1.rt14.479.el9_2, +4 more
    fixed: vendor fix RHSA-2026:71606
  • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt 5.14.0-427.152.1.el9_4, kernel-rt-core 5.14.0-427.152.1.el9_4, kernel-rt-modules 5.14.0-427.152.1.el9_4, kernel-rt-debug-core 5.14.0-427.152.1.el9_4, kernel-rt-modules-core 5.14.0-427.152.1.el9_4, kernel-rt-debug-modules 5.14.0-427.152.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:71569
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.106.1.el10_0, kernel-rt-64k 6.12.0-55.106.1.el10_0, kernel-rt-core 6.12.0-55.106.1.el10_0, kernel-rt-modules 6.12.0-55.106.1.el10_0, kernel-rt-64k-core 6.12.0-55.106.1.el10_0, kernel-rt-debug-core 6.12.0-55.106.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:71326
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.143.1.el9_6, kernel-rt-64k 5.14.0-570.143.1.el9_6, kernel-rt-core 5.14.0-570.143.1.el9_6, kernel-rt-modules 5.14.0-570.143.1.el9_6, kernel-rt-64k-core 5.14.0-570.143.1.el9_6, kernel-rt-debug-core 5.14.0-570.143.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:71327
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.50.1.el9_8, kernel-rt-core 5.14.0-687.50.1.el9_8, kernel-rt-modules 5.14.0-687.50.1.el9_8, kernel-rt-debug-core 5.14.0-687.50.1.el9_8, kernel-rt-modules-core 5.14.0-687.50.1.el9_8, kernel-rt-debug-modules 5.14.0-687.50.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:70459
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.58.1.el10_2, kernel-rt-core 6.12.0-211.58.1.el10_2, kernel-rt-modules 6.12.0-211.58.1.el10_2, kernel-rt-debug-core 6.12.0-211.58.1.el10_2, kernel-rt-modules-core 6.12.0-211.58.1.el10_2, kernel-rt-debug-modules 6.12.0-211.58.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:70498
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.194.1.rt14.479.el9_2, kernel-rt-kvm 5.14.0-284.194.1.rt14.479.el9_2, kernel-rt-core 5.14.0-284.194.1.rt14.479.el9_2, kernel-rt-modules 5.14.0-284.194.1.rt14.479.el9_2, kernel-rt-debug-kvm 5.14.0-284.194.1.rt14.479.el9_2, kernel-rt-debug-core 5.14.0-284.194.1.rt14.479.el9_2, +6 more
    fixed: vendor fix RHSA-2026:71606
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt 5.14.0-427.152.1.el9_4, kernel-rt-kvm 5.14.0-427.152.1.el9_4, kernel-rt-core 5.14.0-427.152.1.el9_4, kernel-rt-modules 5.14.0-427.152.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.152.1.el9_4, kernel-rt-debug-core 5.14.0-427.152.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:71569
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.106.1.el10_0, kernel-rt-kvm 6.12.0-55.106.1.el10_0, kernel-rt-core 6.12.0-55.106.1.el10_0, kernel-rt-modules 6.12.0-55.106.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.106.1.el10_0, kernel-rt-debug-core 6.12.0-55.106.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:71326
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.143.1.el9_6, kernel-rt-kvm 5.14.0-570.143.1.el9_6, kernel-rt-core 5.14.0-570.143.1.el9_6, kernel-rt-modules 5.14.0-570.143.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.143.1.el9_6, kernel-rt-debug-core 5.14.0-570.143.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:71327
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-core 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-modules 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-debug-core 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-debug-modules 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-modules-extra 4.18.0-553.166.1.rt7.507.el8_10, +2 more
    fixed: vendor fix RHSA-2026:70403

2 more fixed, 1 more not affected in the full advisory

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 ICSA-26-295-11 updated cvss 7.8

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.7 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.7
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-26-209-04 updated cvss 5.5

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.6 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.6
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Timeline

  1. Published
  2. CISA SSVC: exploitation active
  3. Added to CISA KEV
  4. CISA patch deadline

Known exploited

Added
52 d ago
Patch by
2026-09-21 (49 d ago)
Ransomware
Not known
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Vendor, product
Linux, Kernel
CISA name
Linux Kernel Race Condition Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
52 d ago

Exploit prediction

1.61% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
Technology feeds

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.