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high 7.8

CVE-2025-39964 kev in the critical feed json

crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

published last yr. modified 21d 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

Is CVE-2025-39964 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-2025-39964 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
last mo.
Patch by
2026-09-21 (last mo.)
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
last mo.

Exploit prediction

1.61% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-09).

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 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.