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Fencer Vulns
critical 9.1

CVE-2026-23455 in the critical feed json

netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()

published 2026-04-03 7 mo ago modified 2026-10-19 20 d ago also EUVD-2026-18711

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

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

netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()

In DecodeQ931(), the UserUserIE code path reads a 16-bit length from the packet, then decrements it by 1 to skip the protocol discriminator byte before passing it to DecodeH323_UserInformation(). If the encoded length is 0, the decrement wraps to -1, which is then passed as a large value to the decoder, leading to an out-of-bounds read.

Add a check to ensure len is positive after the decrement.

Patch / fix

  • Linux Linux 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10, 7.0
  • linux Debian 12 6.1.170-1
  • linux Debian 13 6.12.85-1
  • linux Debian 14 6.19.10-1

debian advisories DEBIAN-CVE-2026-23455

  • linux Ubuntu 22.04 LTS 5.15.0-185.195
  • linux Ubuntu 24.04 LTS 6.8.0-134.134
  • linux Ubuntu 25.10 6.17.0-40.40
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1111.118
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1060.63
  • linux-aws Ubuntu 25.10 6.17.0-1019.19
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1111.121
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1063.69

ubuntu advisories UBUNTU-CVE-2026-23455

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-rt RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.126.1.rt7.467.el8_10

red hat advisories RHSA-2026:55445RHSA-2026:41236RHSA-2026:35896RHSA-2026:35863RHSA-2026:35844RHSA-2026:33899

  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.55.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.55.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.55.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.55.1
  • kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.55.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.55.1
  • kernel-obs-build SLE Module for Development Tools 15 SP7 6.4.0-150700.53.55.1
  • kernel-default-base SLE Module for Basesystem 15 SP7 6.4.0-150700.53.55.1.150700.17.33.1

suse advisories SUSE-SU-2026:2238-1SUSE-SU-2026:21834-1

  • kernel AlmaLinux 9 5.14.0-687.12.1.el9_8
  • rv AlmaLinux 9 5.14.0-687.12.1.el9_8
  • perf AlmaLinux 9 5.14.0-687.12.1.el9_8
  • rtla AlmaLinux 9 5.14.0-687.12.1.el9_8
  • libperf AlmaLinux 9 5.14.0-687.12.1.el9_8
  • kernel-rt AlmaLinux 9 5.14.0-687.12.1.el9_8
  • kernel-64k AlmaLinux 9 5.14.0-687.12.1.el9_8
  • kernel-core AlmaLinux 9 5.14.0-687.12.1.el9_8

almalinux advisories ALSA-2026:21556ALSA-2026:21557ALSA-2026:21706ALSA-2026:21745

  • kernel Rocky Linux 10 6.12.0-211.18.1.el10_2
  • kernel-rt Rocky Linux 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel Rocky Linux 8 4.18.0-553.126.1.el8_10
  • kernel Rocky Linux 9 5.14.0-687.12.1.el9_8

rocky linux advisories RLSA-2026:21557RLSA-2026:21745RLSA-2026:21706RLSA-2026:21556

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-2026-23455 updated cvss 7.1

kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()

  • 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 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.120.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.120.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.120.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.120.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.120.1.el9_6
    fixed: vendor fix RHSA-2026:25218
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.12.1.el9_8, perf 5.14.0-687.12.1.el9_8, rtla 5.14.0-687.12.1.el9_8, python3-perf 5.14.0-687.12.1.el9_8, kernel-devel-matched 5.14.0-687.12.1.el9_8, kernel-64k-devel-matched 5.14.0-687.12.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:21556
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.18.1.el10_2, perf 6.12.0-211.18.1.el10_2, rtla 6.12.0-211.18.1.el10_2, python3-perf 6.12.0-211.18.1.el10_2, kernel-devel-matched 6.12.0-211.18.1.el10_2, kernel-64k-devel-matched 6.12.0-211.18.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:21557
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.176.1.el9_2, rtla 5.14.0-284.176.1.el9_2, kernel-devel-matched 5.14.0-284.176.1.el9_2, kernel-64k-devel-matched 5.14.0-284.176.1.el9_2, kernel-debug-devel-matched 5.14.0-284.176.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.176.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:26515
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) rv 5.14.0-427.134.1.el9_4, perf 5.14.0-427.134.1.el9_4, rtla 5.14.0-427.134.1.el9_4, kernel-devel-matched 5.14.0-427.134.1.el9_4, kernel-64k-devel-matched 5.14.0-427.134.1.el9_4, kernel-debug-devel-matched 5.14.0-427.134.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:27713
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.98.1.el10_0, perf 6.12.0-55.98.1.el10_0, rtla 6.12.0-55.98.1.el10_0, python3-perf 6.12.0-55.98.1.el10_0, kernel-devel-matched 6.12.0-55.98.1.el10_0, kernel-64k-devel-matched 6.12.0-55.98.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:55445
show 32 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.120.1.el9_6, perf 5.14.0-570.120.1.el9_6, rtla 5.14.0-570.120.1.el9_6, python3-perf 5.14.0-570.120.1.el9_6, kernel-devel-matched 5.14.0-570.120.1.el9_6, kernel-64k-devel-matched 5.14.0-570.120.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:25218
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.126.1.el8_10, kernel 4.18.0-553.126.1.el8_10, bpftool 4.18.0-553.126.1.el8_10, kernel-core 4.18.0-553.126.1.el8_10, kernel-tools 4.18.0-553.126.1.el8_10, python3-perf 4.18.0-553.126.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:21706
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.12.1.el9_8, kernel-64k 5.14.0-687.12.1.el9_8, kernel-core 5.14.0-687.12.1.el9_8, kernel-tools 5.14.0-687.12.1.el9_8, kernel-modules 5.14.0-687.12.1.el9_8, kernel-64k-core 5.14.0-687.12.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:21556
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.18.1.el10_2, kernel-64k 6.12.0-211.18.1.el10_2, kernel-core 6.12.0-211.18.1.el10_2, kernel-tools 6.12.0-211.18.1.el10_2, kernel-modules 6.12.0-211.18.1.el10_2, kernel-64k-core 6.12.0-211.18.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:21557
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.197.1.el8_4, kernel 4.18.0-305.197.1.el8_4, bpftool 4.18.0-305.197.1.el8_4, kernel-core 4.18.0-305.197.1.el8_4, kernel-tools 4.18.0-305.197.1.el8_4, python3-perf 4.18.0-305.197.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:35896
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.198.1.el8_6, kernel 4.18.0-372.198.1.el8_6, bpftool 4.18.0-372.198.1.el8_6, kernel-core 4.18.0-372.198.1.el8_6, kernel-tools 4.18.0-372.198.1.el8_6, python3-perf 4.18.0-372.198.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:33899
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.150.1.el8_8, kernel 4.18.0-477.150.1.el8_8, bpftool 4.18.0-477.150.1.el8_8, kernel-core 4.18.0-477.150.1.el8_8, kernel-tools 4.18.0-477.150.1.el8_8, python3-perf 4.18.0-477.150.1.el8_8, +9 more
    fixed: vendor fix RHSA-2026:35863
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.176.1.el9_2, kernel 5.14.0-284.176.1.el9_2, kernel-64k 5.14.0-284.176.1.el9_2, kernel-core 5.14.0-284.176.1.el9_2, kernel-tools 5.14.0-284.176.1.el9_2, python3-perf 5.14.0-284.176.1.el9_2, +28 more
    fixed: vendor fix RHSA-2026:26515
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool 7.3.0-427.134.1.el9_4, kernel 5.14.0-427.134.1.el9_4, kernel-64k 5.14.0-427.134.1.el9_4, kernel-core 5.14.0-427.134.1.el9_4, kernel-tools 5.14.0-427.134.1.el9_4, python3-perf 5.14.0-427.134.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:27713
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.98.1.el10_0, kernel-64k 6.12.0-55.98.1.el10_0, kernel-core 6.12.0-55.98.1.el10_0, kernel-tools 6.12.0-55.98.1.el10_0, kernel-modules 6.12.0-55.98.1.el10_0, kernel-64k-core 6.12.0-55.98.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:55445
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.120.1.el9_6, kernel-64k 5.14.0-570.120.1.el9_6, kernel-core 5.14.0-570.120.1.el9_6, kernel-tools 5.14.0-570.120.1.el9_6, kernel-modules 5.14.0-570.120.1.el9_6, kernel-64k-core 5.14.0-570.120.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:25218
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.197.1.el8_4, kernel 4.18.0-305.197.1.el8_4, bpftool 4.18.0-305.197.1.el8_4, kernel-core 4.18.0-305.197.1.el8_4, kernel-tools 4.18.0-305.197.1.el8_4, python3-perf 4.18.0-305.197.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:35896
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) perf 4.18.0-372.198.1.el8_6, kernel 4.18.0-372.198.1.el8_6, bpftool 4.18.0-372.198.1.el8_6, kernel-core 4.18.0-372.198.1.el8_6, kernel-tools 4.18.0-372.198.1.el8_6, python3-perf 4.18.0-372.198.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:33899
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.150.1.el8_8, kernel 4.18.0-477.150.1.el8_8, bpftool 4.18.0-477.150.1.el8_8, kernel-core 4.18.0-477.150.1.el8_8, kernel-tools 4.18.0-477.150.1.el8_8, python3-perf 4.18.0-477.150.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:35863
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.12.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.12.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.12.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.12.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.12.1.el9_8
    fixed: vendor fix RHSA-2026:21556
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.18.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.18.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.18.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.18.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.18.1.el10_2
    fixed: vendor fix RHSA-2026:21557
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.98.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.98.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.98.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.98.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.98.1.el10_0
    fixed: vendor fix RHSA-2026:55445
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.126.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.126.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.126.1.el8_10
    fixed: vendor fix RHSA-2026:21706
  • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt 3.10.0-1160.155.1.rt56.1307.el7, kernel-rt-trace 3.10.0-1160.155.1.rt56.1307.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.155.1.rt56.1307.el7
    fixed: vendor fix RHSA-2026:41236
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-kvm 4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-core 4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-modules 4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-debug-kvm 4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-debug-core 4.18.0-553.126.1.rt7.467.el8_10, +4 more
    fixed: vendor fix RHSA-2026:21745
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.12.1.el9_8, kernel-rt-64k 5.14.0-687.12.1.el9_8, kernel-rt-core 5.14.0-687.12.1.el9_8, kernel-rt-modules 5.14.0-687.12.1.el9_8, kernel-rt-64k-core 5.14.0-687.12.1.el9_8, kernel-rt-debug-core 5.14.0-687.12.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:21556
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.18.1.el10_2, kernel-rt-64k 6.12.0-211.18.1.el10_2, kernel-rt-core 6.12.0-211.18.1.el10_2, kernel-rt-modules 6.12.0-211.18.1.el10_2, kernel-rt-64k-core 6.12.0-211.18.1.el10_2, kernel-rt-debug-core 6.12.0-211.18.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:21557
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-core 5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-modules 5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-debug-core 5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-modules-core 5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-debug-modules 5.14.0-284.176.1.rt14.461.el9_2, +4 more
    fixed: vendor fix RHSA-2026:26462
  • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt 5.14.0-427.134.1.el9_4, kernel-rt-core 5.14.0-427.134.1.el9_4, kernel-rt-modules 5.14.0-427.134.1.el9_4, kernel-rt-debug-core 5.14.0-427.134.1.el9_4, kernel-rt-modules-core 5.14.0-427.134.1.el9_4, kernel-rt-debug-modules 5.14.0-427.134.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:27713
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.98.1.el10_0, kernel-rt-64k 6.12.0-55.98.1.el10_0, kernel-rt-core 6.12.0-55.98.1.el10_0, kernel-rt-modules 6.12.0-55.98.1.el10_0, kernel-rt-64k-core 6.12.0-55.98.1.el10_0, kernel-rt-debug-core 6.12.0-55.98.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:55445
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.120.1.el9_6, kernel-rt-64k 5.14.0-570.120.1.el9_6, kernel-rt-core 5.14.0-570.120.1.el9_6, kernel-rt-modules 5.14.0-570.120.1.el9_6, kernel-rt-64k-core 5.14.0-570.120.1.el9_6, kernel-rt-debug-core 5.14.0-570.120.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:25218
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.12.1.el9_8, kernel-rt-core 5.14.0-687.12.1.el9_8, kernel-rt-modules 5.14.0-687.12.1.el9_8, kernel-rt-debug-core 5.14.0-687.12.1.el9_8, kernel-rt-modules-core 5.14.0-687.12.1.el9_8, kernel-rt-debug-modules 5.14.0-687.12.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:21556
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.18.1.el10_2, kernel-rt-core 6.12.0-211.18.1.el10_2, kernel-rt-modules 6.12.0-211.18.1.el10_2, kernel-rt-debug-core 6.12.0-211.18.1.el10_2, kernel-rt-modules-core 6.12.0-211.18.1.el10_2, kernel-rt-debug-modules 6.12.0-211.18.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:21557
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-kvm 5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-core 5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-modules 5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-debug-kvm 5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-debug-core 5.14.0-284.176.1.rt14.461.el9_2, +6 more
    fixed: vendor fix RHSA-2026:26462
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt 5.14.0-427.134.1.el9_4, kernel-rt-kvm 5.14.0-427.134.1.el9_4, kernel-rt-core 5.14.0-427.134.1.el9_4, kernel-rt-modules 5.14.0-427.134.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.134.1.el9_4, kernel-rt-debug-core 5.14.0-427.134.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:27713
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.98.1.el10_0, kernel-rt-kvm 6.12.0-55.98.1.el10_0, kernel-rt-core 6.12.0-55.98.1.el10_0, kernel-rt-modules 6.12.0-55.98.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.98.1.el10_0, kernel-rt-debug-core 6.12.0-55.98.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:55445
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.120.1.el9_6, kernel-rt-kvm 5.14.0-570.120.1.el9_6, kernel-rt-core 5.14.0-570.120.1.el9_6, kernel-rt-modules 5.14.0-570.120.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.120.1.el9_6, kernel-rt-debug-core 5.14.0-570.120.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:25218

3 more fixed 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 9.1

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 9.1

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

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
23 d ago

Exploit prediction

1.59% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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
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.