Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.4.1, < 5.10.248 |
References
- https://git.kernel.org/stable/c/46ca9dc978923c5e1247a9e9519240ba7ace413cPatch
- https://git.kernel.org/stable/c/5d5602236f5db19e8b337a2cd87a90ace5ea776dPatch
- https://git.kernel.org/stable/c/78d87b72cebe2a993fd5b017e9f14fb6278f2eaePatch
- https://git.kernel.org/stable/c/79dd3f1d9dd310c2af89b09c71f34d93973b200fPatch
- https://git.kernel.org/stable/c/ba6f0d1832eeb5eb3a6dc5cb30e0f720b3cb3536Patch
- https://git.kernel.org/stable/c/c3a4316e3c746af415c0fd6c6d489ad13f53714dPatch
- https://git.kernel.org/stable/c/ebb0dfd718dd31c8d3600612ca4b7207ec3d923aPatch
FAQ
What is CVE-2025-71182?
CVE-2025-71182 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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...
How severe is CVE-2025-71182?
CVE-2025-71182 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-71182?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.