What’s Vulnerable › Vulnerabilities

CVE-2024-56645: can: j1939: j1939_session_new(): fix skb reference counting

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-12-27 · updated 2026-08-04

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]

Affected products

• Linux kernel: from 5.4 before 5.4.287; from 5.5 before 5.10.231; from 5.11 before 5.15.174; from 5.16 before 6.1.120; from 6.2 before 6.6.66; from 6.7 before 6.12.5 — fixed in 5.10.231, 5.15.174, 5.4.287, 6.1.120, 6.12.5, 6.6.66

How to fix

Upgrade to a fixed version: Linux kernel 5.10.231, 5.15.174, 5.4.287, 6.1.120. Check the vendor advisory for mitigations.

References

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

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