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CVE-2024-56645 is a reference-counting vulnerability in the Linux kernel CAN J1939 subsystem. The j1939_session_skb_queue() function takes an additional socket-buffer reference through skb_get() for each newly queued buffer, but j1939_session_new() fails to take the corresponding reference for the initial buffer. This inconsistent reference handling can cause a socket-buffer reference-count underflow. The fix adds the missing reference acquisition in j1939_session_new().
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No public exploit code observed for this vulnerability.
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7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel CAN J1939 vulnerability involving socket-buffer reference counting in j1939_session_new(). The advisory identifies affected kernel packages on Rocky Linux 10.2 and recommends updating them.
Linux kernel J1939 socket-buffer reference-counting flaw.
Linux kernel CAN J1939 flaw caused by incorrect skb reference counting in j1939_session_new(). Red Hat includes a fix in its Important RHSA-2026:25908 kernel update.
A Linux kernel vulnerability in the CAN J1939 subsystem involving skb reference counting in j1939_session_new().
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.