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Fencer Vulns
critical 9.8

CVE-2024-56645 in the critical feed json

can: j1939: j1939_session_new(): fix skb reference counting

published 2024-12-27 22 mo ago modified 2026-08-05 3 mo ago also EUVD-2024-53293

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

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

can: j1939: j1939_session_new(): fix skb reference counting

Since j1939_session_skb_queue() does an extra skb_get() for each new skb, do the same for the initial one in j1939_session_new() to avoid refcount underflow.

[mkl: clean up commit message]

Patch / fix

  • Linux Linux 5.4.287, 5.10.231, 5.15.174, 6.1.120, 6.6.66, 6.12.5, 6.13
  • linux Debian 12 6.1.123-1
  • linux Debian 14, Debian 13 6.12.5-1

debian advisories DEBIAN-CVE-2024-56645

  • linux Ubuntu 20.04 LTS 5.4.0-211.231
  • linux Ubuntu 22.04 LTS 5.15.0-135.146
  • linux Ubuntu 24.04 LTS 6.8.0-58.60
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1142.152
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1080.87
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1027.29
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1145.154
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1079.88

ubuntu advisories UBUNTU-CVE-2024-56645

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 10.2 6.12.0-211.18.1.el10_2
  • rv RHEL 10.2 6.12.0-211.18.1.el10_2
  • perf RHEL 10.2 6.12.0-211.18.1.el10_2
  • rtla RHEL 10.2 6.12.0-211.18.1.el10_2
  • libperf RHEL 10.2 6.12.0-211.18.1.el10_2
  • kernel-rt RHEL 10.2 6.12.0-211.18.1.el10_2
  • kernel-64k RHEL 10.2 6.12.0-211.18.1.el10_2
  • kernel-core RHEL 10.2 6.12.0-211.18.1.el10_2

red hat advisories RHSA-2026:25908RHSA-2026:21557RHSA-2026:6164RHSA-2025:20518

  • kernel-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-25.1
  • kernel-source-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-25.1
  • kernel-livepatch-MICRO-6-0-RT_Update_5 Linux Micro 6.1, Linux Micro 6.0 1-1.1
  • kernel-source Linux Micro 6.1, Linux Micro 6.0 6.4.0-25.1
  • kernel-default Linux Micro 6.1, Linux Micro 6.0 6.4.0-25.1
  • kernel-kvmsmall Linux Micro 6.1, Linux Micro 6.0 6.4.0-25.1
  • kernel-default-base Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1.21.4
  • kernel-livepatch-MICRO-6-0_Update_5 Linux Micro 6.1, Linux Micro 6.0 1-1.2

suse advisories SUSE-SU-2025:20166-1SUSE-SU-2025:20249-1SUSE-SU-2025:20165-1SUSE-SU-2025:20248-1SUSE-SU-2025:0577-1SUSE-SU-2025:0577-2

  • kernel AlmaLinux 10 6.12.0-211.18.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.18.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.18.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.18.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.18.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.18.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.18.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.18.1.el10_2

almalinux advisories ALSA-2026:21557ALSA-2025:20518

  • kernel Rocky Linux 10 6.12.0-211.18.1.el10_2
  • kernel Rocky Linux 9 5.14.0-611.5.1.el9_7

rocky linux advisories RLSA-2026:21557RLSA-2025:20518

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-2024-56645 updated cvss 7.1

kernel: can: j1939: j1939_session_new(): fix skb reference counting

  • 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 CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.103.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.103.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.103.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.103.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.103.1.el9_6
    fixed: vendor fix RHSA-2026:6164
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.5.1.el9_7, perf 5.14.0-611.5.1.el9_7, rtla 5.14.0-611.5.1.el9_7, python3-perf 5.14.0-611.5.1.el9_7, kernel-devel-matched 5.14.0-611.5.1.el9_7, kernel-64k-devel-matched 5.14.0-611.5.1.el9_7, +7 more
    fixed: vendor fix RHSA-2025:20518
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.18.1.el10_2, perf 6.12.0-211.18.1.el10_2, rtla 6.12.0-211.18.1.el10_2, python3-perf 6.12.0-211.18.1.el10_2, kernel-devel-matched 6.12.0-211.18.1.el10_2, kernel-64k-devel-matched 6.12.0-211.18.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:21557
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.79.1.el10_0, perf 6.12.0-55.79.1.el10_0, rtla 6.12.0-55.79.1.el10_0, python3-perf 6.12.0-55.79.1.el10_0, kernel-devel-matched 6.12.0-55.79.1.el10_0, kernel-64k-devel-matched 6.12.0-55.79.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:25908
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.103.1.el9_6, perf 5.14.0-570.103.1.el9_6, rtla 5.14.0-570.103.1.el9_6, python3-perf 5.14.0-570.103.1.el9_6, kernel-devel-matched 5.14.0-570.103.1.el9_6, kernel-64k-devel-matched 5.14.0-570.103.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:6164
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.5.1.el9_7, kernel-64k 5.14.0-611.5.1.el9_7, kernel-core 5.14.0-611.5.1.el9_7, kernel-tools 5.14.0-611.5.1.el9_7, kernel-modules 5.14.0-611.5.1.el9_7, kernel-64k-core 5.14.0-611.5.1.el9_7, +27 more
    fixed: vendor fix RHSA-2025:20518
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.18.1.el10_2, kernel-64k 6.12.0-211.18.1.el10_2, kernel-core 6.12.0-211.18.1.el10_2, kernel-tools 6.12.0-211.18.1.el10_2, kernel-modules 6.12.0-211.18.1.el10_2, kernel-64k-core 6.12.0-211.18.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:21557
show 14 more
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.79.1.el10_0, kernel-64k 6.12.0-55.79.1.el10_0, kernel-core 6.12.0-55.79.1.el10_0, kernel-tools 6.12.0-55.79.1.el10_0, kernel-modules 6.12.0-55.79.1.el10_0, kernel-64k-core 6.12.0-55.79.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:25908
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.103.1.el9_6, kernel-64k 5.14.0-570.103.1.el9_6, kernel-core 5.14.0-570.103.1.el9_6, kernel-tools 5.14.0-570.103.1.el9_6, kernel-modules 5.14.0-570.103.1.el9_6, kernel-64k-core 5.14.0-570.103.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:6164
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.5.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-611.5.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-611.5.1.el9_7, kernel-debuginfo-common-aarch64 5.14.0-611.5.1.el9_7, kernel-debuginfo-common-ppc64le 5.14.0-611.5.1.el9_7
    fixed: vendor fix RHSA-2025:20518
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.18.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.18.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.18.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.18.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.18.1.el10_2
    fixed: vendor fix RHSA-2026:21557
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.79.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.79.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.79.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.79.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.79.1.el10_0
    fixed: vendor fix RHSA-2026:25908
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.5.1.el9_7, kernel-rt-64k 5.14.0-611.5.1.el9_7, kernel-rt-core 5.14.0-611.5.1.el9_7, kernel-rt-modules 5.14.0-611.5.1.el9_7, kernel-rt-64k-core 5.14.0-611.5.1.el9_7, kernel-rt-debug-core 5.14.0-611.5.1.el9_7, +14 more
    fixed: vendor fix RHSA-2025:20518
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.18.1.el10_2, kernel-rt-64k 6.12.0-211.18.1.el10_2, kernel-rt-core 6.12.0-211.18.1.el10_2, kernel-rt-modules 6.12.0-211.18.1.el10_2, kernel-rt-64k-core 6.12.0-211.18.1.el10_2, kernel-rt-debug-core 6.12.0-211.18.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:21557
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.79.1.el10_0, kernel-rt-64k 6.12.0-55.79.1.el10_0, kernel-rt-core 6.12.0-55.79.1.el10_0, kernel-rt-modules 6.12.0-55.79.1.el10_0, kernel-rt-64k-core 6.12.0-55.79.1.el10_0, kernel-rt-debug-core 6.12.0-55.79.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:25908
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.103.1.el9_6, kernel-rt-64k 5.14.0-570.103.1.el9_6, kernel-rt-core 5.14.0-570.103.1.el9_6, kernel-rt-modules 5.14.0-570.103.1.el9_6, kernel-rt-64k-core 5.14.0-570.103.1.el9_6, kernel-rt-debug-core 5.14.0-570.103.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:6164
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-611.5.1.el9_7, kernel-rt-core 5.14.0-611.5.1.el9_7, kernel-rt-modules 5.14.0-611.5.1.el9_7, kernel-rt-debug-core 5.14.0-611.5.1.el9_7, kernel-rt-modules-core 5.14.0-611.5.1.el9_7, kernel-rt-debug-modules 5.14.0-611.5.1.el9_7, +4 more
    fixed: vendor fix RHSA-2025:20518
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.18.1.el10_2, kernel-rt-core 6.12.0-211.18.1.el10_2, kernel-rt-modules 6.12.0-211.18.1.el10_2, kernel-rt-debug-core 6.12.0-211.18.1.el10_2, kernel-rt-modules-core 6.12.0-211.18.1.el10_2, kernel-rt-debug-modules 6.12.0-211.18.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:21557
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.79.1.el10_0, kernel-rt-kvm 6.12.0-55.79.1.el10_0, kernel-rt-core 6.12.0-55.79.1.el10_0, kernel-rt-modules 6.12.0-55.79.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.79.1.el10_0, kernel-rt-debug-core 6.12.0-55.79.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:25908
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.103.1.el9_6, kernel-rt-kvm 5.14.0-570.103.1.el9_6, kernel-rt-core 5.14.0-570.103.1.el9_6, kernel-rt-modules 5.14.0-570.103.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.103.1.el9_6, kernel-rt-debug-core 5.14.0-570.103.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:6164
  • 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
    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-25-226-07 updated cvss 5.5

Siemens Third-Party Components in SINEC OS

  • Siemens RUGGEDCOM RST2428P (6GK6242-6PA00) < 3.2
    affected: fixed in V3.2 support.industry.siemens.com
  • Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family < 3.2
    affected: fixed in V3.2
  • Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family < 3.2
    affected: fixed in V3.2 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% 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
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

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.