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Fencer Vulns
medium 5.5

CVE-2026-23060 json

crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec

published 2026-02-04 9 mo ago modified 2026-10-19 20 d ago also EUVD-2026-5484

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

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

crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec

authencesn assumes an ESP/ESN-formatted AAD. When assoclen is shorter than the minimum expected length, crypto_authenc_esn_decrypt() can advance past the end of the destination scatterlist and trigger a NULL pointer dereference in scatterwalk_map_and_copy(), leading to a kernel panic (DoS).

Add a minimum AAD length check to fail fast on invalid inputs.

Patch / fix

  • Linux Linux 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.68, 6.18.8, 6.19
  • linux Debian 12 6.1.162-1
  • linux Debian 13 6.12.69-1
  • linux Debian 14 6.18.8-1

debian advisories DEBIAN-CVE-2026-23060

  • linux Ubuntu 22.04 LTS 5.15.0-174.184
  • linux Ubuntu 24.04 LTS 6.8.0-107.107
  • linux Ubuntu 25.10 6.17.0-20.20
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1104.111
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1051.54
  • linux-aws Ubuntu 25.10 6.17.0-1010.10
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1104.113
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1053.56

ubuntu advisories UBUNTU-CVE-2026-23060

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 9 5.14.0-687.5.3.el9_8
  • rv RHEL 9 5.14.0-687.5.3.el9_8
  • perf RHEL 9 5.14.0-687.5.3.el9_8
  • rtla RHEL 9 5.14.0-687.5.3.el9_8
  • libperf RHEL 9 5.14.0-687.5.3.el9_8
  • kernel-rt RHEL 9 5.14.0-687.5.3.el9_8
  • kernel-64k RHEL 9 5.14.0-687.5.3.el9_8
  • kernel-core RHEL 9 5.14.0-687.5.3.el9_8

red hat advisories RHSA-2026:19225RHSA-2026:19074

  • kernel-rt SLE Micro 5.4, SLE Micro 5.3 5.14.21-150400.15.145.1
  • kernel-source-rt SLE Micro 5.4, SLE Micro 5.3 5.14.21-150400.15.145.1
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.34.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.34.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.34.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.34.1
  • kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.34.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.34.1

suse advisories SUSE-SU-2026:1131-1SUSE-SU-2026:1081-1SUSE-SU-2026:1078-1SUSE-SU-2026:1077-1SUSE-SU-2026:1041-1SUSE-SU-2026:1003-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.27.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.27.1

opensuse advisories openSUSE-SU-2026:20416-1

  • kernel AlmaLinux 10 6.12.0-211.7.3.el10_2
  • rv AlmaLinux 10 6.12.0-211.7.3.el10_2
  • perf AlmaLinux 10 6.12.0-211.7.3.el10_2
  • rtla AlmaLinux 10 6.12.0-211.7.3.el10_2
  • libperf AlmaLinux 10 6.12.0-211.7.3.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.7.3.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.7.3.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.7.3.el10_2

almalinux advisories ALSA-2026:19074ALSA-2026:19225

  • kernel Azure Linux 3.0 6.6.126.1-1

azure linux advisories AZL-77115

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-2026-23060 updated cvss 6.5

kernel: Linux kernel: Denial of Service in authencesn due to too-short AAD

  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    affected: workaround, no fix available, no fix planned “To mitigate this issue, prevent module authenc from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.”
  • 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: workaround, no fix available “To mitigate this issue, prevent module authenc from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.”
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.5.3.el9_8, perf 5.14.0-687.5.3.el9_8, rtla 5.14.0-687.5.3.el9_8, python3-perf 5.14.0-687.5.3.el9_8, kernel-devel-matched 5.14.0-687.5.3.el9_8, kernel-64k-devel-matched 5.14.0-687.5.3.el9_8, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module authenc from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:19225
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.7.3.el10_2, perf 6.12.0-211.7.3.el10_2, rtla 6.12.0-211.7.3.el10_2, python3-perf 6.12.0-211.7.3.el10_2, kernel-devel-matched 6.12.0-211.7.3.el10_2, kernel-64k-devel-matched 6.12.0-211.7.3.el10_2, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module authenc from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:19074
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.5.3.el9_8, kernel-64k 5.14.0-687.5.3.el9_8, kernel-core 5.14.0-687.5.3.el9_8, kernel-tools 5.14.0-687.5.3.el9_8, kernel-modules 5.14.0-687.5.3.el9_8, kernel-64k-core 5.14.0-687.5.3.el9_8, +27 more
    fixed: vendor fix “To mitigate this issue, prevent module authenc from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:19225
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.7.3.el10_2, kernel-64k 6.12.0-211.7.3.el10_2, kernel-core 6.12.0-211.7.3.el10_2, kernel-tools 6.12.0-211.7.3.el10_2, kernel-modules 6.12.0-211.7.3.el10_2, kernel-64k-core 6.12.0-211.7.3.el10_2, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module authenc from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:19074
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.5.3.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.5.3.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.5.3.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.5.3.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.5.3.el9_8
    fixed: vendor fix “To mitigate this issue, prevent module authenc from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:19225
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.7.3.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.7.3.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.7.3.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.7.3.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.7.3.el10_2
    fixed: vendor fix “To mitigate this issue, prevent module authenc from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:19074
show 5 more
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.5.3.el9_8, kernel-rt-64k 5.14.0-687.5.3.el9_8, kernel-rt-core 5.14.0-687.5.3.el9_8, kernel-rt-modules 5.14.0-687.5.3.el9_8, kernel-rt-64k-core 5.14.0-687.5.3.el9_8, kernel-rt-debug-core 5.14.0-687.5.3.el9_8, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module authenc from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:19225
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.7.3.el10_2, kernel-rt-64k 6.12.0-211.7.3.el10_2, kernel-rt-core 6.12.0-211.7.3.el10_2, kernel-rt-modules 6.12.0-211.7.3.el10_2, kernel-rt-64k-core 6.12.0-211.7.3.el10_2, kernel-rt-debug-core 6.12.0-211.7.3.el10_2, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module authenc from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:19074
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.5.3.el9_8, kernel-rt-core 5.14.0-687.5.3.el9_8, kernel-rt-modules 5.14.0-687.5.3.el9_8, kernel-rt-debug-core 5.14.0-687.5.3.el9_8, kernel-rt-modules-core 5.14.0-687.5.3.el9_8, kernel-rt-debug-modules 5.14.0-687.5.3.el9_8, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module authenc from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:19225
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.7.3.el10_2, kernel-rt-core 6.12.0-211.7.3.el10_2, kernel-rt-modules 6.12.0-211.7.3.el10_2, kernel-rt-debug-core 6.12.0-211.7.3.el10_2, kernel-rt-modules-core 6.12.0-211.7.3.el10_2, kernel-rt-debug-modules 6.12.0-211.7.3.el10_2, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module authenc from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:19074
  • 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
    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 7.0

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 7.0

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
partial
Assessed
4 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
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
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.