CVE-2024-56645: linux kernel — Fix

Description

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]

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.4 — 5.4.287
linux	linux_kernel	5.5 — 5.10.231
linux	linux_kernel	5.11 — 5.15.174
linux	linux_kernel	5.16 — 6.1.120
linux	linux_kernel	6.2 — 6.6.66
linux	linux_kernel	6.7 — 6.12.5
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/224e606a8d8e8c7db94036272c47a37455667313 https://git.kernel.org/stable/c/4199dd78a59896e091d3a7a05a77451aa7fd724d https://git.kernel.org/stable/c/426d94815e12b6bdb9a75af294fbbafb9301601d https://git.kernel.org/stable/c/68fceb143b635cdc59fed3896d5910aff38f345e https://git.kernel.org/stable/c/a8c695005bfe6569acd73d777ca298ddddd66105 https://git.kernel.org/stable/c/b3282c2bebeeb82ceec492ee4972f51ee7a4a132 https://git.kernel.org/stable/c/f117cba69cbbd496babb3defcdf440df4fd6fe14

Other References

https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Frequently Asked Questions

What is CVE-2024-56645? +

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] It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-56645? +

CVE-2024-56645 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-56645? +

CVE-2024-56645 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-56645? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2024-56645