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CVE-2025-39925 is a reference-release flaw in the Linux kernel CAN J1939 subsystem. When a J1939 socket is bound, j1939_sk_bind() acquires an additional reference to struct j1939_priv. The subsystem lacked a NETDEV_UNREGISTER notification handler to release that reference when the associated network device was unregistered. Consequently, the net_device usage count cannot fall sufficiently for unregister_netdevice() to complete. The fix implements NETDEV_UNREGISTER handling that calls j1939_priv_put() to undo the bind-time reference acquisition before socket destruction.
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A Linux kernel CAN J1939 vulnerability addressed by implementing a NETDEV_UNREGISTER notification handler.
A Linux kernel CAN J1939 vulnerability addressed by implementing a NETDEV_UNREGISTER notification handler.
A Linux kernel CAN J1939 vulnerability related to missing or improper NETDEV_UNREGISTER notification handling.
A Linux kernel CAN J1939 vulnerability related to missing or improper NETDEV_UNREGISTER notification handling.
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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.