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Fencer Vulns
critical 9.8

CVE-2025-40176 in the critical feed json

tls: wait for pending async decryptions if tls_strp_msg_hold fails

published 2025-11-12 11 mo ago modified 2026-10-19 20 d ago also EUVD-2025-124907

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

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

tls: wait for pending async decryptions if tls_strp_msg_hold fails

Async decryption calls tls_strp_msg_hold to create a clone of the input skb to hold references to the memory it uses. If we fail to allocate that clone, proceeding with async decryption can lead to various issues (UAF on the skb, writing into userspace memory after the recv() call has returned).

In this case, wait for all pending decryption requests.

Patch / fix

  • Linux Linux 6.1.158, 6.6.114, 6.12.55, 6.17.5, 6.18
  • linux Debian 12 6.1.158-1
  • linux Debian 13 6.12.57-1
  • linux Debian 14 6.17.6-1

debian advisories DEBIAN-CVE-2025-40176

  • linux Ubuntu 24.04 LTS 6.8.0-106.106
  • linux Ubuntu 25.10 6.17.0-14.14
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1050.53
  • linux-aws Ubuntu 25.10 6.17.0-1007.7
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1052.55
  • linux-gcp Ubuntu 25.10 6.17.0-1007.7
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1048.53
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1049.49

ubuntu advisories UBUNTU-CVE-2025-40176

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 10.1 6.12.0-124.27.1.el10_1
  • rv RHEL 10.1 6.12.0-124.27.1.el10_1
  • perf RHEL 10.1 6.12.0-124.27.1.el10_1
  • rtla RHEL 10.1 6.12.0-124.27.1.el10_1
  • libperf RHEL 10.1 6.12.0-124.27.1.el10_1
  • kernel-rt RHEL 10.1 6.12.0-124.27.1.el10_1
  • kernel-64k RHEL 10.1 6.12.0-124.27.1.el10_1
  • kernel-core RHEL 10.1 6.12.0-124.27.1.el10_1

red hat advisories RHSA-2026:0747RHSA-2026:0535RHSA-2026:0534RHSA-2026:0489RHSA-2026:0457RHSA-2026:0453

  • kernel-source Linux Micro 6.1, Linux Micro 6.0 6.4.0-38.1
  • kernel-default Linux Micro 6.1, Linux Micro 6.0 6.4.0-38.1
  • kernel-kvmsmall Linux Micro 6.1, Linux Micro 6.0 6.4.0-38.1
  • kernel-default-base Linux Micro 6.1, Linux Micro 6.0 6.4.0-38.1.21.15
  • kernel-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-39.1
  • kernel-source-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-39.1
  • kernel-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.61.1
  • kernel-syms-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.61.1

suse advisories SUSE-SU-2026:20473-1SUSE-SU-2026:20496-1SUSE-SU-2026:20039-1SUSE-SU-2026:20059-1SUSE-SU-2025:4521-1SUSE-SU-2025:4517-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.8.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.8.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.8.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.8.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.8.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.8.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.8.1
  • kernel-kvmsmall openSUSE Leap 16.0 6.12.0-160000.8.1

opensuse advisories openSUSE-SU-2025:20172-1

  • kernel-abi-stablelists AlmaLinux 10 6.12.0-124.27.1.el10_1
  • kernel AlmaLinux 9 5.14.0-611.16.1.el9_7
  • rv AlmaLinux 9 5.14.0-611.16.1.el9_7
  • perf AlmaLinux 9 5.14.0-611.16.1.el9_7
  • rtla AlmaLinux 9 5.14.0-611.16.1.el9_7
  • libperf AlmaLinux 9 5.14.0-611.16.1.el9_7
  • kernel-rt AlmaLinux 9 5.14.0-611.16.1.el9_7
  • kernel-64k AlmaLinux 9 5.14.0-611.16.1.el9_7

almalinux advisories ALSA-2026:0453ALSA-2025:23241

  • kernel Rocky Linux 10 6.12.0-124.27.1.el10_1
  • kernel Rocky Linux 9 5.14.0-611.16.1.el9_7

rocky linux advisories RLSA-2026:0453RLSA-2025:23241

  • kernel Azure Linux 3.0 6.6.117.1-1

azure linux advisories AZL-70028

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-2025-40176 updated cvss 7.3

kernel: tls: wait for pending async decryptions if tls_strp_msg_hold fails

  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.106.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.106.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.106.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.106.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.106.1.el9_4
    fixed: vendor fix RHSA-2026:0489
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.77.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.77.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.77.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.77.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.77.1.el9_6
    fixed: vendor fix RHSA-2026:0457
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.16.1.el9_7, perf 5.14.0-611.16.1.el9_7, rtla 5.14.0-611.16.1.el9_7, python3-perf 5.14.0-611.16.1.el9_7, kernel-devel-matched 5.14.0-611.16.1.el9_7, kernel-64k-devel-matched 5.14.0-611.16.1.el9_7, +7 more
    fixed: vendor fix RHSA-2025:23241
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.27.1.el10_1, perf 6.12.0-124.27.1.el10_1, rtla 6.12.0-124.27.1.el10_1, python3-perf 6.12.0-124.27.1.el10_1, kernel-devel-matched 6.12.0-124.27.1.el10_1, kernel-64k-devel-matched 6.12.0-124.27.1.el10_1, +7 more
    fixed: vendor fix RHSA-2026:0453
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.152.1.el9_2, rtla 5.14.0-284.152.1.el9_2, kernel-devel-matched 5.14.0-284.152.1.el9_2, kernel-64k-devel-matched 5.14.0-284.152.1.el9_2, kernel-debug-devel-matched 5.14.0-284.152.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.152.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:0535
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.54.1.el10_0, perf 6.12.0-55.54.1.el10_0, rtla 6.12.0-55.54.1.el10_0, python3-perf 6.12.0-55.54.1.el10_0, kernel-devel-matched 6.12.0-55.54.1.el10_0, kernel-64k-devel-matched 6.12.0-55.54.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:0747
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.106.1.el9_4, perf 5.14.0-427.106.1.el9_4, rtla 5.14.0-427.106.1.el9_4, kernel-devel-matched 5.14.0-427.106.1.el9_4, kernel-64k-devel-matched 5.14.0-427.106.1.el9_4, kernel-debug-devel-matched 5.14.0-427.106.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:0489
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.77.1.el9_6, perf 5.14.0-570.77.1.el9_6, rtla 5.14.0-570.77.1.el9_6, python3-perf 5.14.0-570.77.1.el9_6, kernel-devel-matched 5.14.0-570.77.1.el9_6, kernel-64k-devel-matched 5.14.0-570.77.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:0457
show 22 more
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.16.1.el9_7, kernel-64k 5.14.0-611.16.1.el9_7, kernel-core 5.14.0-611.16.1.el9_7, kernel-tools 5.14.0-611.16.1.el9_7, kernel-modules 5.14.0-611.16.1.el9_7, kernel-64k-core 5.14.0-611.16.1.el9_7, +27 more
    fixed: vendor fix RHSA-2025:23241
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.27.1.el10_1, kernel-64k 6.12.0-124.27.1.el10_1, kernel-core 6.12.0-124.27.1.el10_1, kernel-tools 6.12.0-124.27.1.el10_1, kernel-modules 6.12.0-124.27.1.el10_1, kernel-64k-core 6.12.0-124.27.1.el10_1, +28 more
    fixed: vendor fix RHSA-2026:0453
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.152.1.el9_2, kernel 5.14.0-284.152.1.el9_2, kernel-64k 5.14.0-284.152.1.el9_2, kernel-core 5.14.0-284.152.1.el9_2, kernel-tools 5.14.0-284.152.1.el9_2, python3-perf 5.14.0-284.152.1.el9_2, +28 more
    fixed: vendor fix RHSA-2026:0535
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.54.1.el10_0, kernel-64k 6.12.0-55.54.1.el10_0, kernel-core 6.12.0-55.54.1.el10_0, kernel-tools 6.12.0-55.54.1.el10_0, kernel-modules 6.12.0-55.54.1.el10_0, kernel-64k-core 6.12.0-55.54.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:0747
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.106.1.el9_4, kernel 5.14.0-427.106.1.el9_4, kernel-64k 5.14.0-427.106.1.el9_4, kernel-core 5.14.0-427.106.1.el9_4, kernel-tools 5.14.0-427.106.1.el9_4, python3-perf 5.14.0-427.106.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:0489
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.77.1.el9_6, kernel-64k 5.14.0-570.77.1.el9_6, kernel-core 5.14.0-570.77.1.el9_6, kernel-tools 5.14.0-570.77.1.el9_6, kernel-modules 5.14.0-570.77.1.el9_6, kernel-64k-core 5.14.0-570.77.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:0457
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.16.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-611.16.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-611.16.1.el9_7, kernel-debuginfo-common-aarch64 5.14.0-611.16.1.el9_7, kernel-debuginfo-common-ppc64le 5.14.0-611.16.1.el9_7
    fixed: vendor fix RHSA-2025:23241
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.27.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-124.27.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-124.27.1.el10_1, kernel-debuginfo-common-aarch64 6.12.0-124.27.1.el10_1, kernel-debuginfo-common-ppc64le 6.12.0-124.27.1.el10_1
    fixed: vendor fix RHSA-2026:0453
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.54.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.54.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.54.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.54.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.54.1.el10_0
    fixed: vendor fix RHSA-2026:0747
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.16.1.el9_7, kernel-rt-64k 5.14.0-611.16.1.el9_7, kernel-rt-core 5.14.0-611.16.1.el9_7, kernel-rt-modules 5.14.0-611.16.1.el9_7, kernel-rt-64k-core 5.14.0-611.16.1.el9_7, kernel-rt-debug-core 5.14.0-611.16.1.el9_7, +14 more
    fixed: vendor fix RHSA-2025:23241
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.27.1.el10_1, kernel-rt-64k 6.12.0-124.27.1.el10_1, kernel-rt-core 6.12.0-124.27.1.el10_1, kernel-rt-modules 6.12.0-124.27.1.el10_1, kernel-rt-64k-core 6.12.0-124.27.1.el10_1, kernel-rt-debug-core 6.12.0-124.27.1.el10_1, +14 more
    fixed: vendor fix RHSA-2026:0453
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-core 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-modules 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-debug-core 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-modules-core 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-debug-modules 5.14.0-284.152.1.rt14.437.el9_2, +4 more
    fixed: vendor fix RHSA-2026:0534
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.54.1.el10_0, kernel-rt-64k 6.12.0-55.54.1.el10_0, kernel-rt-core 6.12.0-55.54.1.el10_0, kernel-rt-modules 6.12.0-55.54.1.el10_0, kernel-rt-64k-core 6.12.0-55.54.1.el10_0, kernel-rt-debug-core 6.12.0-55.54.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:0747
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.106.1.el9_4, kernel-rt-core 5.14.0-427.106.1.el9_4, kernel-rt-modules 5.14.0-427.106.1.el9_4, kernel-rt-debug-core 5.14.0-427.106.1.el9_4, kernel-rt-modules-core 5.14.0-427.106.1.el9_4, kernel-rt-debug-modules 5.14.0-427.106.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:0489
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.77.1.el9_6, kernel-rt-64k 5.14.0-570.77.1.el9_6, kernel-rt-core 5.14.0-570.77.1.el9_6, kernel-rt-modules 5.14.0-570.77.1.el9_6, kernel-rt-64k-core 5.14.0-570.77.1.el9_6, kernel-rt-debug-core 5.14.0-570.77.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:0457
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-611.16.1.el9_7, kernel-rt-core 5.14.0-611.16.1.el9_7, kernel-rt-modules 5.14.0-611.16.1.el9_7, kernel-rt-debug-core 5.14.0-611.16.1.el9_7, kernel-rt-modules-core 5.14.0-611.16.1.el9_7, kernel-rt-debug-modules 5.14.0-611.16.1.el9_7, +4 more
    fixed: vendor fix RHSA-2025:23241
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.27.1.el10_1, kernel-rt-core 6.12.0-124.27.1.el10_1, kernel-rt-modules 6.12.0-124.27.1.el10_1, kernel-rt-debug-core 6.12.0-124.27.1.el10_1, kernel-rt-modules-core 6.12.0-124.27.1.el10_1, kernel-rt-debug-modules 6.12.0-124.27.1.el10_1, +4 more
    fixed: vendor fix RHSA-2026:0453
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-kvm 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-core 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-modules 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-debug-kvm 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-debug-core 5.14.0-284.152.1.rt14.437.el9_2, +6 more
    fixed: vendor fix RHSA-2026:0534
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.54.1.el10_0, kernel-rt-kvm 6.12.0-55.54.1.el10_0, kernel-rt-core 6.12.0-55.54.1.el10_0, kernel-rt-modules 6.12.0-55.54.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.54.1.el10_0, kernel-rt-debug-core 6.12.0-55.54.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:0747
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.106.1.el9_4, kernel-rt-kvm 5.14.0-427.106.1.el9_4, kernel-rt-core 5.14.0-427.106.1.el9_4, kernel-rt-modules 5.14.0-427.106.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.106.1.el9_4, kernel-rt-debug-core 5.14.0-427.106.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:0489
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.77.1.el9_6, kernel-rt-kvm 5.14.0-570.77.1.el9_6, kernel-rt-core 5.14.0-570.77.1.el9_6, kernel-rt-modules 5.14.0-570.77.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.77.1.el9_6, kernel-rt-debug-core 5.14.0-570.77.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:0457
  • 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
24 d ago

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

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.