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Fencer Vulns
high 7.8

CVE-2026-23270 json

net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks

published 2026-03-18 7 mo ago modified 2026-10-19 20 d ago also EUVD-2026-12913

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

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

net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks

As Paolo said earlier [1]:

"Since the blamed commit below, classify can return TC_ACT_CONSUMED while the current skb being held by the defragmentation engine. As reported by GangMin Kim, if such packet is that may cause a UaF when the defrag engine later on tries to tuch again such packet."

act_ct was never meant to be used in the egress path, however some users are attaching it to egress today [2]. Attempting to reach a middle ground, we noticed that, while most qdiscs are not handling TC_ACT_CONSUMED, clsact/ingress qdiscs are. With that in mind, we address the issue by only allowing act_ct to bind to clsact/ingress qdiscs and shared blocks. That way it's still possible to attach act_ct to egress (albeit only with clsact).

[1] https://lore.kernel.org/netdev/674b8cbfc385c6f37fb29a1de08d8fe5c2b0fbee.1771321118.git.pabeni@redhat.com/ [2] https://lore.kernel.org/netdev/cc6bfb4a-4a2b-42d8-b9ce-7ef6644fb22b@ovn.org/

Patch / fix

  • Linux Linux 5.15.203, 6.1.167, 6.6.130, 6.8, 6.12.77, 6.18.18, 6.19.8, 7.0
  • linux Debian 12 6.1.170-1
  • linux Debian 13 6.12.85-1
  • linux Debian 14 6.19.8-1

debian advisories DEBIAN-CVE-2026-23270

  • linux Ubuntu 22.04 LTS 5.15.0-186.196
  • linux Ubuntu 24.04 LTS 6.8.0-136.136
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1112.119
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1061.64
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1112.122
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1064.72
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1108.114
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1059.67

ubuntu advisories UBUNTU-CVE-2026-23270

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-2026:35863RHSA-2026:24343RHSA-2026:23224RHSA-2026:22940RHSA-2026:22900RHSA-2026:21745

  • kernel-rt Real Time Module 15 SP7 6.4.0-150700.7.37.2
  • kernel-syms-rt Real Time Module 15 SP7 6.4.0-150700.7.37.1
  • kernel-source-rt Real Time Module 15 SP7 6.4.0-150700.7.37.2
  • kernel-rt Linux Micro 6.2 6.12.0-160000.28.1
  • kernel-64kb Linux Micro 6.2 6.12.0-160000.28.1
  • kernel-source Linux Micro 6.2 6.12.0-160000.28.1
  • kernel-default Linux Micro 6.2 6.12.0-160000.28.1
  • kernel-default-base Linux Micro 6.2 6.12.0-160000.27.1.160000.2.8

suse advisories SUSE-SU-2026:1573-1SUSE-SU-2026:21237-1SUSE-SU-2026:21230-1SUSE-SU-2026:21255-1SUSE-SU-2026:21123-1SUSE-SU-2026:21114-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.28.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.28.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.28.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.28.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.28.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.28.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.28.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.28.1

opensuse advisories openSUSE-SU-2026:20572-1

  • kernel AlmaLinux 8 4.18.0-553.126.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.126.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.126.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.126.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.126.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.126.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.126.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.126.1.el8_10

almalinux advisories ALSA-2026:21706ALSA-2026:21745ALSA-2026:19568ALSA-2026:19569ALSA-2026:13565ALSA-2026:13566

  • 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 10 6.12.0-211.16.1.el10_2.0.1
  • kernel Rocky Linux 9 5.14.0-687.10.1.el9_8.0.1
  • kernel Rocky Linux 9 5.14.0-611.54.1.el9_7.cloud.1.0
  • kernel Rocky Linux 10 6.12.0-124.55.1.el10_1
  • kernel Rocky Linux 9 5.14.0-611.54.1.el9_7

rocky linux advisories RLSA-2026:21745RLSA-2026:21706RLSA-2026:19569RLSA-2026:19568RXSA-2026:13565RLSA-2026:13566

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-2026-23270 updated cvss 7.0

kernel: Linux kernel: Use-after-free in traffic control (act_ct) may lead to denial of service or privilege escalation

  • 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.9.4) libperf 5.14.0-427.127.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.127.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.127.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.127.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.127.1.el9_4
    fixed: vendor fix RHSA-2026:21209
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.119.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.119.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.119.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.119.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.119.1.el9_6
    fixed: vendor fix RHSA-2026:23224
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.54.1.el9_7, rv 5.14.0-687.10.1.el9_8, perf 5.14.0-611.54.1.el9_7, perf 5.14.0-687.10.1.el9_8, rtla 5.14.0-611.54.1.el9_7, rtla 5.14.0-687.10.1.el9_8, +20 more
    fixed: vendor fix RHSA-2026:13565
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.55.1.el10_1, rv 6.12.0-211.16.1.el10_2, perf 6.12.0-124.55.1.el10_1, perf 6.12.0-211.16.1.el10_2, rtla 6.12.0-124.55.1.el10_1, rtla 6.12.0-211.16.1.el10_2, +20 more
    fixed: vendor fix RHSA-2026:13566
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.174.1.el9_2, rtla 5.14.0-284.174.1.el9_2, kernel-devel-matched 5.14.0-284.174.1.el9_2, kernel-64k-devel-matched 5.14.0-284.174.1.el9_2, kernel-debug-devel-matched 5.14.0-284.174.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.174.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:22940
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.77.1.el10_0, perf 6.12.0-55.77.1.el10_0, rtla 6.12.0-55.77.1.el10_0, python3-perf 6.12.0-55.77.1.el10_0, kernel-devel-matched 6.12.0-55.77.1.el10_0, kernel-64k-devel-matched 6.12.0-55.77.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:24343
show 30 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.127.1.el9_4, perf 5.14.0-427.127.1.el9_4, rtla 5.14.0-427.127.1.el9_4, kernel-devel-matched 5.14.0-427.127.1.el9_4, kernel-64k-devel-matched 5.14.0-427.127.1.el9_4, kernel-debug-devel-matched 5.14.0-427.127.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:21209
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.119.1.el9_6, perf 5.14.0-570.119.1.el9_6, rtla 5.14.0-570.119.1.el9_6, python3-perf 5.14.0-570.119.1.el9_6, kernel-devel-matched 5.14.0-570.119.1.el9_6, kernel-64k-devel-matched 5.14.0-570.119.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:23224
  • 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 5.14.0-611.54.1.el9_7, kernel 5.14.0-687.10.1.el9_8, kernel-64k 5.14.0-611.54.1.el9_7, kernel-64k 5.14.0-687.10.1.el9_8, kernel-core 5.14.0-611.54.1.el9_7, kernel-core 5.14.0-687.10.1.el9_8, +60 more
    fixed: vendor fix RHSA-2026:13565
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.55.1.el10_1, kernel 6.12.0-211.16.1.el10_2, kernel-64k 6.12.0-124.55.1.el10_1, kernel-64k 6.12.0-211.16.1.el10_2, kernel-core 6.12.0-124.55.1.el10_1, kernel-core 6.12.0-211.16.1.el10_2, +62 more
    fixed: vendor fix RHSA-2026:13566
  • 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 7.0.0-284.174.1.el9_2, kernel 5.14.0-284.174.1.el9_2, kernel-64k 5.14.0-284.174.1.el9_2, kernel-core 5.14.0-284.174.1.el9_2, kernel-tools 5.14.0-284.174.1.el9_2, python3-perf 5.14.0-284.174.1.el9_2, +28 more
    fixed: vendor fix RHSA-2026:22940
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.77.1.el10_0, kernel-64k 6.12.0-55.77.1.el10_0, kernel-core 6.12.0-55.77.1.el10_0, kernel-tools 6.12.0-55.77.1.el10_0, kernel-modules 6.12.0-55.77.1.el10_0, kernel-64k-core 6.12.0-55.77.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:24343
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.127.1.el9_4, kernel 5.14.0-427.127.1.el9_4, kernel-64k 5.14.0-427.127.1.el9_4, kernel-core 5.14.0-427.127.1.el9_4, kernel-tools 5.14.0-427.127.1.el9_4, python3-perf 5.14.0-427.127.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:21209
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.119.1.el9_6, kernel-64k 5.14.0-570.119.1.el9_6, kernel-core 5.14.0-570.119.1.el9_6, kernel-tools 5.14.0-570.119.1.el9_6, kernel-modules 5.14.0-570.119.1.el9_6, kernel-64k-core 5.14.0-570.119.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:23224
  • 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 5.14.0-611.54.1.el9_7, libperf 5.14.0-687.10.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-611.54.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-687.10.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-611.54.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-687.10.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:13565
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.55.1.el10_1, libperf 6.12.0-211.16.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-124.55.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-211.16.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-124.55.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-211.16.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:13566
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.77.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.77.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.77.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.77.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.77.1.el10_0
    fixed: vendor fix RHSA-2026:24343
  • 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 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 5.14.0-611.54.1.el9_7, kernel-rt 5.14.0-687.10.1.el9_8, kernel-rt-64k 5.14.0-611.54.1.el9_7, kernel-rt-64k 5.14.0-687.10.1.el9_8, kernel-rt-core 5.14.0-611.54.1.el9_7, kernel-rt-core 5.14.0-687.10.1.el9_8, +34 more
    fixed: vendor fix RHSA-2026:13565
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.55.1.el10_1, kernel-rt 6.12.0-211.16.1.el10_2, kernel-rt-64k 6.12.0-124.55.1.el10_1, kernel-rt-64k 6.12.0-211.16.1.el10_2, kernel-rt-core 6.12.0-124.55.1.el10_1, kernel-rt-core 6.12.0-211.16.1.el10_2, +34 more
    fixed: vendor fix RHSA-2026:13566
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-core 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-modules 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-debug-core 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-modules-core 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-debug-modules 5.14.0-284.174.1.rt14.459.el9_2, +4 more
    fixed: vendor fix RHSA-2026:22900
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.77.1.el10_0, kernel-rt-64k 6.12.0-55.77.1.el10_0, kernel-rt-core 6.12.0-55.77.1.el10_0, kernel-rt-modules 6.12.0-55.77.1.el10_0, kernel-rt-64k-core 6.12.0-55.77.1.el10_0, kernel-rt-debug-core 6.12.0-55.77.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:24343
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.127.1.el9_4, kernel-rt-core 5.14.0-427.127.1.el9_4, kernel-rt-modules 5.14.0-427.127.1.el9_4, kernel-rt-debug-core 5.14.0-427.127.1.el9_4, kernel-rt-modules-core 5.14.0-427.127.1.el9_4, kernel-rt-debug-modules 5.14.0-427.127.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:21209
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.119.1.el9_6, kernel-rt-64k 5.14.0-570.119.1.el9_6, kernel-rt-core 5.14.0-570.119.1.el9_6, kernel-rt-modules 5.14.0-570.119.1.el9_6, kernel-rt-64k-core 5.14.0-570.119.1.el9_6, kernel-rt-debug-core 5.14.0-570.119.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:23224
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-611.54.1.el9_7, kernel-rt 5.14.0-687.10.1.el9_8, kernel-rt-core 5.14.0-611.54.1.el9_7, kernel-rt-core 5.14.0-687.10.1.el9_8, kernel-rt-modules 5.14.0-611.54.1.el9_7, kernel-rt-modules 5.14.0-687.10.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:13565
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.55.1.el10_1, kernel-rt 6.12.0-211.16.1.el10_2, kernel-rt-core 6.12.0-124.55.1.el10_1, kernel-rt-core 6.12.0-211.16.1.el10_2, kernel-rt-modules 6.12.0-124.55.1.el10_1, kernel-rt-modules 6.12.0-211.16.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:13566
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-kvm 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-core 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-modules 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-debug-kvm 5.14.0-284.174.1.rt14.459.el9_2, kernel-rt-debug-core 5.14.0-284.174.1.rt14.459.el9_2, +6 more
    fixed: vendor fix RHSA-2026:22900
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.77.1.el10_0, kernel-rt-kvm 6.12.0-55.77.1.el10_0, kernel-rt-core 6.12.0-55.77.1.el10_0, kernel-rt-modules 6.12.0-55.77.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.77.1.el10_0, kernel-rt-debug-core 6.12.0-55.77.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:24343
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.127.1.el9_4, kernel-rt-kvm 5.14.0-427.127.1.el9_4, kernel-rt-core 5.14.0-427.127.1.el9_4, kernel-rt-modules 5.14.0-427.127.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.127.1.el9_4, kernel-rt-debug-core 5.14.0-427.127.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:21209
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.119.1.el9_6, kernel-rt-kvm 5.14.0-570.119.1.el9_6, kernel-rt-core 5.14.0-570.119.1.el9_6, kernel-rt-modules 5.14.0-570.119.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.119.1.el9_6, kernel-rt-debug-core 5.14.0-570.119.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:23224
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 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-core 4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-debug-modules 4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-modules-extra 4.18.0-553.126.1.rt7.467.el8_10, +2 more
    fixed: vendor fix RHSA-2026:21745
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 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 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-26-295-16 updated cvss 7.8

Siemens SIMATIC S7-1500 TM MFP

  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
    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 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) >= 3.1.6 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
no
Technical impact
total
Assessed
24 d ago

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% 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

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 SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
  • 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.