Skip to content
Fencer Vulns
high 8.1

CVE-2025-40168 json

smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().

published 2025-11-12 11 mo ago modified 2026-10-19 20 d ago also EUVD-2025-124915

cvss
8.1
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:

smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().

smc_clc_prfx_match() is called from smc_listen_work() and not under RCU nor RTNL.

Using sk_dst_get(sk)->dev could trigger UAF.

Let's use __sk_dst_get() and dst_dev_rcu().

Note that the returned value of smc_clc_prfx_match() is not used in the caller.

Patch / fix

  • Linux Linux 6.1.187, 6.6.156, 6.12.108, 6.17.3, 6.18
  • linux Debian 12 6.1.187-1
  • linux Debian 13 6.12.111-1
  • linux Debian 14 6.17.6-1
  • linux-6.12 Debian 12 6.12.111-1~deb12u1

debian advisories DEBIAN-CVE-2025-40168

  • linux Ubuntu 25.10 6.17.0-14.14
  • linux-aws Ubuntu 25.10 6.17.0-1007.7
  • linux-gcp Ubuntu 25.10 6.17.0-1007.7
  • linux-azure Ubuntu 25.10 6.17.0-1008.8
  • linux-raspi Ubuntu 25.10 6.17.0-1008.8
  • linux-riscv Ubuntu 25.10 6.17.0-14.14.1
  • linux-oracle Ubuntu 25.10 6.17.0-1007.7
  • linux-aws-6.17 Ubuntu 24.04 LTS 6.17.0-1007.7~24.04.1

ubuntu advisories UBUNTU-CVE-2025-40168

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 5.14.0-611.36.1.el9_7
  • rv RHEL 9 5.14.0-611.36.1.el9_7
  • perf RHEL 9 5.14.0-611.36.1.el9_7
  • rtla RHEL 9 5.14.0-611.36.1.el9_7
  • libperf RHEL 9 5.14.0-611.36.1.el9_7
  • kernel-rt RHEL 9 5.14.0-611.36.1.el9_7
  • kernel-64k RHEL 9 5.14.0-611.36.1.el9_7
  • kernel-core RHEL 9 5.14.0-611.36.1.el9_7

red hat advisories RHSA-2026:27708RHSA-2026:9643RHSA-2026:9514RHSA-2026:9513RHSA-2026:6954RHSA-2026:4111

  • 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-2026:0316-1SUSE-SU-2026:20039-1SUSE-SU-2026:20059-1SUSE-SU-2025:4521-1

  • 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 AlmaLinux 9 5.14.0-611.36.1.el9_7
  • rv AlmaLinux 9 5.14.0-611.36.1.el9_7
  • perf AlmaLinux 9 5.14.0-611.36.1.el9_7
  • rtla AlmaLinux 9 5.14.0-611.36.1.el9_7
  • libperf AlmaLinux 9 5.14.0-611.36.1.el9_7
  • kernel-rt AlmaLinux 9 5.14.0-611.36.1.el9_7
  • kernel-64k AlmaLinux 9 5.14.0-611.36.1.el9_7
  • kernel-core AlmaLinux 9 5.14.0-611.36.1.el9_7

almalinux advisories ALSA-2026:3488ALSA-2026:3275ALSA-2026:2821ALSA-2026:2720

  • kernel Rocky Linux 9 5.14.0-611.36.1.el9_7
  • kernel-rt Rocky Linux 8 4.18.0-553.105.1.rt7.446.el8_10
  • kernel Rocky Linux 8 4.18.0-553.105.1.el8_10

rocky linux advisories RLSA-2026:3488RLSA-2026:2821RLSA-2026:2720

  • kernel Azure Linux 3.0 6.6.157.1-1

azure linux advisories AZL-70013

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-2025-40168 updated cvss 7.0

kernel: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match()

  • 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
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.123.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.123.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.123.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.123.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.123.1.el9_6
    fixed: vendor fix RHSA-2026:27708
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.36.1.el9_7, perf 5.14.0-611.36.1.el9_7, rtla 5.14.0-611.36.1.el9_7, python3-perf 5.14.0-611.36.1.el9_7, kernel-devel-matched 5.14.0-611.36.1.el9_7, kernel-64k-devel-matched 5.14.0-611.36.1.el9_7, +7 more
    fixed: vendor fix RHSA-2026:3488
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.39.1.el10_1, perf 6.12.0-124.39.1.el10_1, rtla 6.12.0-124.39.1.el10_1, python3-perf 6.12.0-124.39.1.el10_1, kernel-devel-matched 6.12.0-124.39.1.el10_1, kernel-64k-devel-matched 6.12.0-124.39.1.el10_1, +7 more
    fixed: vendor fix RHSA-2026:3275
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.63.1.el10_0, perf 6.12.0-55.63.1.el10_0, rtla 6.12.0-55.63.1.el10_0, python3-perf 6.12.0-55.63.1.el10_0, kernel-devel-matched 6.12.0-55.63.1.el10_0, kernel-64k-devel-matched 6.12.0-55.63.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:4111
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.123.1.el9_6, perf 5.14.0-570.123.1.el9_6, rtla 5.14.0-570.123.1.el9_6, python3-perf 5.14.0-570.123.1.el9_6, kernel-devel-matched 5.14.0-570.123.1.el9_6, kernel-64k-devel-matched 5.14.0-570.123.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:27708
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.105.1.el8_10, kernel 4.18.0-553.105.1.el8_10, bpftool 4.18.0-553.105.1.el8_10, kernel-core 4.18.0-553.105.1.el8_10, kernel-tools 4.18.0-553.105.1.el8_10, python3-perf 4.18.0-553.105.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:2720
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.36.1.el9_7, kernel-64k 5.14.0-611.36.1.el9_7, kernel-core 5.14.0-611.36.1.el9_7, kernel-tools 5.14.0-611.36.1.el9_7, kernel-modules 5.14.0-611.36.1.el9_7, kernel-64k-core 5.14.0-611.36.1.el9_7, +27 more
    fixed: vendor fix RHSA-2026:3488
show 25 more
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.39.1.el10_1, kernel-64k 6.12.0-124.39.1.el10_1, kernel-core 6.12.0-124.39.1.el10_1, kernel-tools 6.12.0-124.39.1.el10_1, kernel-modules 6.12.0-124.39.1.el10_1, kernel-64k-core 6.12.0-124.39.1.el10_1, +28 more
    fixed: vendor fix RHSA-2026:3275
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.195.1.el8_2, kernel 4.18.0-193.195.1.el8_2, bpftool 4.18.0-193.195.1.el8_2, kernel-core 4.18.0-193.195.1.el8_2, kernel-tools 4.18.0-193.195.1.el8_2, python3-perf 4.18.0-193.195.1.el8_2, +8 more
    fixed: vendor fix RHSA-2026:9513
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.189.1.el8_4, kernel 4.18.0-305.189.1.el8_4, bpftool 4.18.0-305.189.1.el8_4, kernel-core 4.18.0-305.189.1.el8_4, kernel-tools 4.18.0-305.189.1.el8_4, python3-perf 4.18.0-305.189.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:9643
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.188.1.el8_6, kernel 4.18.0-372.188.1.el8_6, bpftool 4.18.0-372.188.1.el8_6, kernel-core 4.18.0-372.188.1.el8_6, kernel-tools 4.18.0-372.188.1.el8_6, python3-perf 4.18.0-372.188.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.188.1.el8_6, kernel 4.18.0-372.188.1.el8_6, bpftool 4.18.0-372.188.1.el8_6, kernel-core 4.18.0-372.188.1.el8_6, kernel-tools 4.18.0-372.188.1.el8_6, python3-perf 4.18.0-372.188.1.el8_6, +15 more
    fixed: vendor fix RHSA-2026:9514
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.135.1.el8_8, kernel 4.18.0-477.135.1.el8_8, bpftool 4.18.0-477.135.1.el8_8, kernel-core 4.18.0-477.135.1.el8_8, kernel-tools 4.18.0-477.135.1.el8_8, python3-perf 4.18.0-477.135.1.el8_8, +9 more
    fixed: vendor fix RHSA-2026:6954
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.63.1.el10_0, kernel-64k 6.12.0-55.63.1.el10_0, kernel-core 6.12.0-55.63.1.el10_0, kernel-tools 6.12.0-55.63.1.el10_0, kernel-modules 6.12.0-55.63.1.el10_0, kernel-64k-core 6.12.0-55.63.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:4111
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.123.1.el9_6, kernel-64k 5.14.0-570.123.1.el9_6, kernel-core 5.14.0-570.123.1.el9_6, kernel-tools 5.14.0-570.123.1.el9_6, kernel-modules 5.14.0-570.123.1.el9_6, kernel-64k-core 5.14.0-570.123.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:27708
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.189.1.el8_4, kernel 4.18.0-305.189.1.el8_4, bpftool 4.18.0-305.189.1.el8_4, kernel-core 4.18.0-305.189.1.el8_4, kernel-tools 4.18.0-305.189.1.el8_4, python3-perf 4.18.0-305.189.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:9643
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.188.1.el8_6, kernel 4.18.0-372.188.1.el8_6, bpftool 4.18.0-372.188.1.el8_6, kernel-core 4.18.0-372.188.1.el8_6, kernel-tools 4.18.0-372.188.1.el8_6, python3-perf 4.18.0-372.188.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:9514
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.135.1.el8_8, kernel 4.18.0-477.135.1.el8_8, bpftool 4.18.0-477.135.1.el8_8, kernel-core 4.18.0-477.135.1.el8_8, kernel-tools 4.18.0-477.135.1.el8_8, python3-perf 4.18.0-477.135.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:6954
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.36.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-611.36.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-611.36.1.el9_7, kernel-debuginfo-common-aarch64 5.14.0-611.36.1.el9_7, kernel-debuginfo-common-ppc64le 5.14.0-611.36.1.el9_7
    fixed: vendor fix RHSA-2026:3488
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.39.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-124.39.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-124.39.1.el10_1, kernel-debuginfo-common-aarch64 6.12.0-124.39.1.el10_1, kernel-debuginfo-common-ppc64le 6.12.0-124.39.1.el10_1
    fixed: vendor fix RHSA-2026:3275
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.63.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.63.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.63.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.63.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.63.1.el10_0
    fixed: vendor fix RHSA-2026:4111
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.105.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.105.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.105.1.el8_10
    fixed: vendor fix RHSA-2026:2720
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.105.1.rt7.446.el8_10, kernel-rt-kvm 4.18.0-553.105.1.rt7.446.el8_10, kernel-rt-core 4.18.0-553.105.1.rt7.446.el8_10, kernel-rt-modules 4.18.0-553.105.1.rt7.446.el8_10, kernel-rt-debug-kvm 4.18.0-553.105.1.rt7.446.el8_10, kernel-rt-debug-core 4.18.0-553.105.1.rt7.446.el8_10, +4 more
    fixed: vendor fix RHSA-2026:2821
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.36.1.el9_7, kernel-rt-64k 5.14.0-611.36.1.el9_7, kernel-rt-core 5.14.0-611.36.1.el9_7, kernel-rt-modules 5.14.0-611.36.1.el9_7, kernel-rt-64k-core 5.14.0-611.36.1.el9_7, kernel-rt-debug-core 5.14.0-611.36.1.el9_7, +14 more
    fixed: vendor fix RHSA-2026:3488
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.39.1.el10_1, kernel-rt-64k 6.12.0-124.39.1.el10_1, kernel-rt-core 6.12.0-124.39.1.el10_1, kernel-rt-modules 6.12.0-124.39.1.el10_1, kernel-rt-64k-core 6.12.0-124.39.1.el10_1, kernel-rt-debug-core 6.12.0-124.39.1.el10_1, +14 more
    fixed: vendor fix RHSA-2026:3275
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.63.1.el10_0, kernel-rt-64k 6.12.0-55.63.1.el10_0, kernel-rt-core 6.12.0-55.63.1.el10_0, kernel-rt-modules 6.12.0-55.63.1.el10_0, kernel-rt-64k-core 6.12.0-55.63.1.el10_0, kernel-rt-debug-core 6.12.0-55.63.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:4111
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.123.1.el9_6, kernel-rt-64k 5.14.0-570.123.1.el9_6, kernel-rt-core 5.14.0-570.123.1.el9_6, kernel-rt-modules 5.14.0-570.123.1.el9_6, kernel-rt-64k-core 5.14.0-570.123.1.el9_6, kernel-rt-debug-core 5.14.0-570.123.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:27708
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-611.36.1.el9_7, kernel-rt-core 5.14.0-611.36.1.el9_7, kernel-rt-modules 5.14.0-611.36.1.el9_7, kernel-rt-debug-core 5.14.0-611.36.1.el9_7, kernel-rt-modules-core 5.14.0-611.36.1.el9_7, kernel-rt-debug-modules 5.14.0-611.36.1.el9_7, +4 more
    fixed: vendor fix RHSA-2026:3488
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.39.1.el10_1, kernel-rt-core 6.12.0-124.39.1.el10_1, kernel-rt-modules 6.12.0-124.39.1.el10_1, kernel-rt-debug-core 6.12.0-124.39.1.el10_1, kernel-rt-modules-core 6.12.0-124.39.1.el10_1, kernel-rt-debug-modules 6.12.0-124.39.1.el10_1, +4 more
    fixed: vendor fix RHSA-2026:3275
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.63.1.el10_0, kernel-rt-kvm 6.12.0-55.63.1.el10_0, kernel-rt-core 6.12.0-55.63.1.el10_0, kernel-rt-modules 6.12.0-55.63.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.63.1.el10_0, kernel-rt-debug-core 6.12.0-55.63.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:4111
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.123.1.el9_6, kernel-rt-kvm 5.14.0-570.123.1.el9_6, kernel-rt-core 5.14.0-570.123.1.el9_6, kernel-rt-modules 5.14.0-570.123.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.123.1.el9_6, kernel-rt-debug-core 5.14.0-570.123.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:27708
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.105.1.rt7.446.el8_10, kernel-rt-core 4.18.0-553.105.1.rt7.446.el8_10, kernel-rt-modules 4.18.0-553.105.1.rt7.446.el8_10, kernel-rt-debug-core 4.18.0-553.105.1.rt7.446.el8_10, kernel-rt-debug-modules 4.18.0-553.105.1.rt7.446.el8_10, kernel-rt-modules-extra 4.18.0-553.105.1.rt7.446.el8_10, +2 more
    fixed: vendor fix RHSA-2026:2821
  • 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 SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo 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 8.1 CVSS:3.1/AV:N/AC:H/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.