CVE-2025-71182 - can: j1939: make j1939_session_activate() fail if device is no longer registered

CVE-2025-71182 - can: j1939: make j1939_session_activate() fail if device is no longer registered

https://cvefeed.io/rssfeed/latest.atom / Sat, 01/31/2026 - 14:00
CVE ID : CVE-2025-71182
Published : Jan. 31, 2026, 11:38 a.m. | 8 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: can: j1939: make j1939_session_activate() fail if device is no longer registered syzbot is still reporting unregister_netdevice: waiting for vcan0 to become free. Usage count = 2 even after commit 93a27b5891b8 ("can: j1939: add missing calls in NETDEV_UNREGISTER notification handler") was added. A debug printk() patch found that j1939_session_activate() can succeed even after j1939_cancel_active_session() from j1939_netdev_notify(NETDEV_UNREGISTER) has completed. Since j1939_cancel_active_session() is processed with the session list lock held, checking ndev->reg_state in j1939_session_activate() with the session list lock held can reliably close the race window.
Severity: 0.0 | NA
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