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CVE-2024-56645 is an improper reference-count update in the Linux kernel CAN J1939 subsystem. In j1939_session_new(), the initial socket buffer did not receive the additional reference acquired for subsequently queued buffers by j1939_session_skb_queue(). This inconsistent ownership accounting could cause an skb reference-count underflow during session and buffer lifecycle handling.
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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().
A Linux kernel vulnerability in the CAN J1939 subsystem involving skb reference counting in j1939_session_new().
A Linux kernel vulnerability in the CAN J1939 subsystem caused by incorrect skb reference counting in j1939_session_new(), which could lead to reference count underflow.
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Cross-references every affected SKU, including bundled OEM variants.
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