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Fencer Vulns
critical 9.1

CVE-2026-46244 in the critical feed json

netfilter: nft_inner: Fix IPv6 inner_thoff desync

published 2026-06-03 5 mo ago modified 2026-10-19 20 d ago also EUVD-2026-34106

cvss
9.1
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 36%
public exploits
0
none known

Summary

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

netfilter: nft_inner: Fix IPv6 inner_thoff desync

In nft_inner_parse_l2l3(), when processing inner IPv6 packets, ipv6_find_hdr() correctly computes the transport header offset traversing all extension headers, but the result is immediately overwritten with nhoff + sizeof(_ip6h) (40 bytes), which only accounts for the IPv6 base header. This creates a desync between inner_thoff (wrong — points to extension header start) and l4proto (correct — e.g., IPPROTO_TCP), enabling transport header forgery and potential firewall bypass. This issue affects stable versions from Linux 6.2.

For comparison, the normal (non-inner) IPv6 path correctly preserves ipv6_find_hdr()'s result. Removing the incorrect overwrite ensures that ipv6_find_hdr()'s calculated transport header offset is preserved, thereby fixing the desynchronization.

Patch / fix

  • Linux Linux 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1
  • Red Hat Red Hat Enterprise Linux 10 0:6.12.0-211.30.1.el10_2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:6.12.0-55.84.1.el10_0
  • Red Hat Red Hat Enterprise Linux 9 0:5.14.0-687.22.1.el9_8
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:5.14.0-427.135.1.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:5.14.0-570.125.1.el9_6
  • linux Debian 13 6.12.94-1
  • linux Debian 14 7.0.12-1

debian advisories DEBIAN-CVE-2026-46244

  • linux Ubuntu 24.04 LTS 6.8.0-134.134
  • linux Ubuntu 25.10 6.17.0-40.40
  • linux Ubuntu 26.04 LTS 7.0.0-27.27
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1060.63
  • linux-aws Ubuntu 25.10 6.17.0-1019.19
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1008.8
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1063.69
  • linux-gcp Ubuntu 25.10 6.17.0-1020.22

ubuntu advisories UBUNTU-CVE-2026-46244

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

  • kpatch-patch-5_14_0-687_10_1 RHEL 9 1-6.el9_8
  • kpatch-patch-6_12_0-211_16_1 RHEL 10.2 1-6.el10_2
  • kernel RHEL 9 5.14.0-687.22.1.el9_8
  • rv RHEL 9 5.14.0-687.22.1.el9_8
  • perf RHEL 9 5.14.0-687.22.1.el9_8
  • rtla RHEL 9 5.14.0-687.22.1.el9_8
  • libperf RHEL 9 5.14.0-687.22.1.el9_8
  • kernel-rt RHEL 9 5.14.0-687.22.1.el9_8

red hat advisories RHSA-2026:56225RHSA-2026:55763RHSA-2026:55618RHSA-2026:36018RHSA-2026:34911RHSA-2026:34443

  • kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.36.1
  • kernel-obs-build Linux Micro Extras 6.2 6.12.0-160000.36.1
  • kernel-rt Linux Micro 6.2 6.12.0-160000.36.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.36.1
  • kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.36.1
  • kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.36.1
  • kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.36.1.160000.2.17
  • kernel-azure SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.36.1

suse advisories SUSE-SU-2026:22742-1SUSE-SU-2026:22769-1SUSE-SU-2026:22835-1SUSE-SU-2026:22812-1SUSE-SU-2026:2799-1SUSE-SU-2026:2722-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.36.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.36.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.36.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.36.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.36.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.36.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.36.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.36.1

opensuse advisories openSUSE-SU-2026:21388-1openSUSE-SU-2026:11014-1

  • kernel AlmaLinux 9 5.14.0-687.22.1.el9_8
  • rv AlmaLinux 9 5.14.0-687.22.1.el9_8
  • perf AlmaLinux 9 5.14.0-687.22.1.el9_8
  • rtla AlmaLinux 9 5.14.0-687.22.1.el9_8
  • libperf AlmaLinux 9 5.14.0-687.22.1.el9_8
  • kernel-rt AlmaLinux 9 5.14.0-687.22.1.el9_8
  • kernel-64k AlmaLinux 9 5.14.0-687.22.1.el9_8
  • kernel-core AlmaLinux 9 5.14.0-687.22.1.el9_8

almalinux advisories ALSA-2026:36018ALSA-2026:34911

  • kernel Rocky Linux 9 5.14.0-687.22.1.el9_8

rocky linux advisories RLSA-2026:36018

  • kernel Azure Linux 3.0 6.6.143.1-1

azure linux advisories AZL-89357

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-2026-46244 updated cvss 7.3

kernel: netfilter: nft_inner: Fix IPv6 inner_thoff desync

  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.125.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.125.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.125.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.125.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.125.1.el9_6
    fixed: vendor fix RHSA-2026:34094
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.22.1.el9_8, perf 5.14.0-687.22.1.el9_8, rtla 5.14.0-687.22.1.el9_8, python3-perf 5.14.0-687.22.1.el9_8, kernel-devel-matched 5.14.0-687.22.1.el9_8, kernel-64k-devel-matched 5.14.0-687.22.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:36018
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.30.1.el10_2, perf 6.12.0-211.30.1.el10_2, rtla 6.12.0-211.30.1.el10_2, python3-perf 6.12.0-211.30.1.el10_2, kernel-devel-matched 6.12.0-211.30.1.el10_2, kernel-64k-devel-matched 6.12.0-211.30.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:34911
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) rv 5.14.0-427.135.1.el9_4, perf 5.14.0-427.135.1.el9_4, rtla 5.14.0-427.135.1.el9_4, kernel-devel-matched 5.14.0-427.135.1.el9_4, kernel-64k-devel-matched 5.14.0-427.135.1.el9_4, kernel-debug-devel-matched 5.14.0-427.135.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:34443
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.84.1.el10_0, perf 6.12.0-55.84.1.el10_0, rtla 6.12.0-55.84.1.el10_0, python3-perf 6.12.0-55.84.1.el10_0, kernel-devel-matched 6.12.0-55.84.1.el10_0, kernel-64k-devel-matched 6.12.0-55.84.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:33215
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.125.1.el9_6, perf 5.14.0-570.125.1.el9_6, rtla 5.14.0-570.125.1.el9_6, python3-perf 5.14.0-570.125.1.el9_6, kernel-devel-matched 5.14.0-570.125.1.el9_6, kernel-64k-devel-matched 5.14.0-570.125.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:34094
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.22.1.el9_8, kernel-64k 5.14.0-687.22.1.el9_8, kernel-core 5.14.0-687.22.1.el9_8, kernel-tools 5.14.0-687.22.1.el9_8, kernel-modules 5.14.0-687.22.1.el9_8, kernel-64k-core 5.14.0-687.22.1.el9_8, +28 more
    fixed: vendor fix RHSA-2026:36018
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.30.1.el10_2, kernel-64k 6.12.0-211.30.1.el10_2, kernel-core 6.12.0-211.30.1.el10_2, kernel-tools 6.12.0-211.30.1.el10_2, kernel-modules 6.12.0-211.30.1.el10_2, kernel-64k-core 6.12.0-211.30.1.el10_2, +29 more
    fixed: vendor fix RHSA-2026:34911
show 17 more
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool 7.3.0-427.135.1.el9_4, kernel 5.14.0-427.135.1.el9_4, kernel-64k 5.14.0-427.135.1.el9_4, kernel-core 5.14.0-427.135.1.el9_4, kernel-tools 5.14.0-427.135.1.el9_4, python3-perf 5.14.0-427.135.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:34443
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.84.1.el10_0, kernel-64k 6.12.0-55.84.1.el10_0, kernel-core 6.12.0-55.84.1.el10_0, kernel-tools 6.12.0-55.84.1.el10_0, kernel-modules 6.12.0-55.84.1.el10_0, kernel-64k-core 6.12.0-55.84.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:33215
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.125.1.el9_6, kernel-64k 5.14.0-570.125.1.el9_6, kernel-core 5.14.0-570.125.1.el9_6, kernel-tools 5.14.0-570.125.1.el9_6, kernel-modules 5.14.0-570.125.1.el9_6, kernel-64k-core 5.14.0-570.125.1.el9_6, +32 more
    fixed: vendor fix RHSA-2026:34094
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.22.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.22.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.22.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.22.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.22.1.el9_8
    fixed: vendor fix RHSA-2026:36018
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.30.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.30.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.30.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.30.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.30.1.el10_2
    fixed: vendor fix RHSA-2026:34911
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.84.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.84.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.84.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.84.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.84.1.el10_0
    fixed: vendor fix RHSA-2026:33215
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.22.1.el9_8, kernel-rt-64k 5.14.0-687.22.1.el9_8, kernel-rt-core 5.14.0-687.22.1.el9_8, kernel-rt-modules 5.14.0-687.22.1.el9_8, kernel-rt-64k-core 5.14.0-687.22.1.el9_8, kernel-rt-debug-core 5.14.0-687.22.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:36018
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.30.1.el10_2, kernel-rt-64k 6.12.0-211.30.1.el10_2, kernel-rt-core 6.12.0-211.30.1.el10_2, kernel-rt-modules 6.12.0-211.30.1.el10_2, kernel-rt-64k-core 6.12.0-211.30.1.el10_2, kernel-rt-debug-core 6.12.0-211.30.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:34911
  • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt 5.14.0-427.135.1.el9_4, kernel-rt-core 5.14.0-427.135.1.el9_4, kernel-rt-modules 5.14.0-427.135.1.el9_4, kernel-rt-debug-core 5.14.0-427.135.1.el9_4, kernel-rt-modules-core 5.14.0-427.135.1.el9_4, kernel-rt-debug-modules 5.14.0-427.135.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:34443
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.84.1.el10_0, kernel-rt-64k 6.12.0-55.84.1.el10_0, kernel-rt-core 6.12.0-55.84.1.el10_0, kernel-rt-modules 6.12.0-55.84.1.el10_0, kernel-rt-64k-core 6.12.0-55.84.1.el10_0, kernel-rt-debug-core 6.12.0-55.84.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:33215
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.125.1.el9_6, kernel-rt-64k 5.14.0-570.125.1.el9_6, kernel-rt-core 5.14.0-570.125.1.el9_6, kernel-rt-modules 5.14.0-570.125.1.el9_6, kernel-rt-64k-core 5.14.0-570.125.1.el9_6, kernel-rt-debug-core 5.14.0-570.125.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:34094
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.22.1.el9_8, kernel-rt-core 5.14.0-687.22.1.el9_8, kernel-rt-modules 5.14.0-687.22.1.el9_8, kernel-rt-debug-core 5.14.0-687.22.1.el9_8, kernel-rt-modules-core 5.14.0-687.22.1.el9_8, kernel-rt-debug-modules 5.14.0-687.22.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:36018
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.30.1.el10_2, kernel-rt-core 6.12.0-211.30.1.el10_2, kernel-rt-modules 6.12.0-211.30.1.el10_2, kernel-rt-debug-core 6.12.0-211.30.1.el10_2, kernel-rt-modules-core 6.12.0-211.30.1.el10_2, kernel-rt-debug-modules 6.12.0-211.30.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:34911
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt 5.14.0-427.135.1.el9_4, kernel-rt-kvm 5.14.0-427.135.1.el9_4, kernel-rt-core 5.14.0-427.135.1.el9_4, kernel-rt-modules 5.14.0-427.135.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.135.1.el9_4, kernel-rt-debug-core 5.14.0-427.135.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:34443
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.84.1.el10_0, kernel-rt-kvm 6.12.0-55.84.1.el10_0, kernel-rt-core 6.12.0-55.84.1.el10_0, kernel-rt-modules 6.12.0-55.84.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.84.1.el10_0, kernel-rt-debug-core 6.12.0-55.84.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:33215
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.125.1.el9_6, kernel-rt-kvm 5.14.0-570.125.1.el9_6, kernel-rt-core 5.14.0-570.125.1.el9_6, kernel-rt-modules 5.14.0-570.125.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.125.1.el9_6, kernel-rt-debug-core 5.14.0-570.125.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:34094
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 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
    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 SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
23 d ago

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% 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:H/A:N
CISA ADP 3.1 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
CNA 3.1 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

Affected products

  • Linux Linux
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8

Classification

Weakness
  • CWE-823 Use of Out-of-range Pointer Offset
  • CWE-682 Incorrect Calculation
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.