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Fencer Vulns
critical 9.4

CVE-2026-53131 in the critical feed json

netfilter: require Ethernet MAC header before using eth_hdr()

published 2026-06-25 4 mo ago modified 2026-10-19 20 d ago also EUVD-2026-39336

cvss
9.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

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

netfilter: require Ethernet MAC header before using eth_hdr()

`ip6t_eui64`, `xt_mac`, the `bitmap:ip,mac`, `hash:ip,mac`, and `hash:mac` ipset types, and `nf_log_syslog` access `eth_hdr(skb)` after either assuming that the skb is associated with an Ethernet device or checking only that the `ETH_HLEN` bytes at `skb_mac_header(skb)` lie between `skb->head` and `skb->data`.

Make these paths first verify that the skb is associated with an Ethernet device, that the MAC header was set, and that it spans at least a full Ethernet header before accessing `eth_hdr(skb)`.

Patch / fix

  • Linux Linux 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13, 7.1
  • linux Debian 12 6.1.176-1
  • linux Debian 13 6.12.94-1
  • linux Debian 14 7.0.13-1

debian advisories DEBIAN-CVE-2026-53131

  • linux Ubuntu 22.04 LTS 5.15.0-191.201
  • linux Ubuntu 24.04 LTS 6.8.0-142.142
  • linux Ubuntu 26.04 LTS 7.0.0-29.29
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1115.122
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1065.68
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1010.10
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1115.125
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1069.77

ubuntu advisories UBUNTU-CVE-2026-53131

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 RHEL 8 4.18.0-553.164.1.el8_10
  • perf RHEL 8 4.18.0-553.164.1.el8_10
  • bpftool RHEL 8 4.18.0-553.164.1.el8_10
  • kernel-core RHEL 8 4.18.0-553.164.1.el8_10
  • kernel-tools RHEL 8 4.18.0-553.164.1.el8_10
  • python3-perf RHEL 8 4.18.0-553.164.1.el8_10
  • kernel-modules RHEL 8 4.18.0-553.164.1.el8_10
  • kernel-zfcpdump RHEL 8 4.18.0-553.164.1.el8_10

red hat advisories RHSA-2026:68531RHSA-2026:68532RHSA-2026:67471RHSA-2026:59723

  • kernel-livepatch-SLE16_Update_10 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 9-160000.1.1
  • kernel-livepatch-SLE16_Update_1 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 18-160000.1.1
  • kernel-livepatch-SLE16_Update_5 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 13-160000.1.1
  • kernel-livepatch-SLE16_Update_8 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 10-160000.1.1
  • kernel-livepatch-SLE16_Update_11 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 9-160000.1.1
  • kernel-livepatch-SLE16_Update_0 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 20-160000.4.3
  • kernel-livepatch-SLE16_Update_2 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 16-160000.1.1
  • kernel-livepatch-SLE16_Update_6 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 12-160000.1.1

suse advisories SUSE-SU-2026:24431-1SUSE-SU-2026:24455-1SUSE-SU-2026:24434-1SUSE-SU-2026:24458-1SUSE-SU-2026:24433-1SUSE-SU-2026:24457-1

  • 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-2026:21555-1

  • kernel AlmaLinux 8 4.18.0-553.164.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.164.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.164.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.164.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.164.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.164.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.164.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.164.1.el8_10

almalinux advisories ALSA-2026:68531ALSA-2026:68532ALSA-2026:67471ALSA-2026:59723

  • kernel-rt Rocky Linux 8 4.18.0-553.164.1.rt7.505.el8_10
  • kernel Rocky Linux 8 4.18.0-553.164.1.el8_10
  • kernel Rocky Linux 10 6.12.0-211.55.1.el10_2
  • kernel Rocky Linux 9 5.14.0-687.42.1.el9_8

rocky linux advisories RLSA-2026:68532RLSA-2026:68531RLSA-2026:67471RLSA-2026:59723

  • kernel Azure Linux 3.0 6.6.143.1-1

azure linux advisories AZL-90636

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-2026-53131 updated cvss 7.0

kernel: netfilter: require Ethernet MAC header before using eth_hdr()

  • 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 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 Enterprise Linux AppStream (v. 9) rv 5.14.0-687.42.1.el9_8, perf 5.14.0-687.42.1.el9_8, rtla 5.14.0-687.42.1.el9_8, python3-perf 5.14.0-687.42.1.el9_8, kernel-devel-matched 5.14.0-687.42.1.el9_8, kernel-64k-devel-matched 5.14.0-687.42.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:59723
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.55.1.el10_2, perf 6.12.0-211.55.1.el10_2, rtla 6.12.0-211.55.1.el10_2, python3-perf 6.12.0-211.55.1.el10_2, kernel-devel-matched 6.12.0-211.55.1.el10_2, kernel-64k-devel-matched 6.12.0-211.55.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:67471
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.164.1.el8_10, kernel 4.18.0-553.164.1.el8_10, bpftool 4.18.0-553.164.1.el8_10, kernel-core 4.18.0-553.164.1.el8_10, kernel-tools 4.18.0-553.164.1.el8_10, python3-perf 4.18.0-553.164.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:68531
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.42.1.el9_8, kernel-64k 5.14.0-687.42.1.el9_8, kernel-core 5.14.0-687.42.1.el9_8, kernel-tools 5.14.0-687.42.1.el9_8, kernel-modules 5.14.0-687.42.1.el9_8, kernel-64k-core 5.14.0-687.42.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:59723
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.55.1.el10_2, kernel-64k 6.12.0-211.55.1.el10_2, kernel-core 6.12.0-211.55.1.el10_2, kernel-tools 6.12.0-211.55.1.el10_2, kernel-modules 6.12.0-211.55.1.el10_2, kernel-64k-core 6.12.0-211.55.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:67471
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.42.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.42.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.42.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.42.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.42.1.el9_8
    fixed: vendor fix RHSA-2026:59723
show 8 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.55.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.55.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.55.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.55.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.55.1.el10_2
    fixed: vendor fix RHSA-2026:67471
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.164.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.164.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.164.1.el8_10
    fixed: vendor fix RHSA-2026:68531
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-kvm 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-core 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-modules 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-debug-kvm 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-debug-core 4.18.0-553.164.1.rt7.505.el8_10, +4 more
    fixed: vendor fix RHSA-2026:68532
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.42.1.el9_8, kernel-rt-64k 5.14.0-687.42.1.el9_8, kernel-rt-core 5.14.0-687.42.1.el9_8, kernel-rt-modules 5.14.0-687.42.1.el9_8, kernel-rt-64k-core 5.14.0-687.42.1.el9_8, kernel-rt-debug-core 5.14.0-687.42.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:59723
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.55.1.el10_2, kernel-rt-64k 6.12.0-211.55.1.el10_2, kernel-rt-core 6.12.0-211.55.1.el10_2, kernel-rt-modules 6.12.0-211.55.1.el10_2, kernel-rt-64k-core 6.12.0-211.55.1.el10_2, kernel-rt-debug-core 6.12.0-211.55.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:67471
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.42.1.el9_8, kernel-rt-core 5.14.0-687.42.1.el9_8, kernel-rt-modules 5.14.0-687.42.1.el9_8, kernel-rt-debug-core 5.14.0-687.42.1.el9_8, kernel-rt-modules-core 5.14.0-687.42.1.el9_8, kernel-rt-debug-modules 5.14.0-687.42.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:59723
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.55.1.el10_2, kernel-rt-core 6.12.0-211.55.1.el10_2, kernel-rt-modules 6.12.0-211.55.1.el10_2, kernel-rt-debug-core 6.12.0-211.55.1.el10_2, kernel-rt-modules-core 6.12.0-211.55.1.el10_2, kernel-rt-debug-modules 6.12.0-211.55.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:67471
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-core 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-modules 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-debug-core 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-debug-modules 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-modules-extra 4.18.0-553.164.1.rt7.505.el8_10, +2 more
    fixed: vendor fix RHSA-2026:68532

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-26-295-16 updated cvss 9.4

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 SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
23 d ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

Affected products

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

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.