Medium 5.5Published Jan 31, 2026

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

Updated under an hour ago (Oct 28, 2026, 4:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-362
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 9d71dd0c70099914fcd063135da3c580865e924c before ebb0dfd718dd31c8d3600612ca4b7207ec3d923a; from 9d71dd0c70099914fcd063135da3c580865e924c before c3a4316e3c746af415c0fd6c6d489ad13f53714d; from 9d71dd0c70099914fcd063135da3c580865e924c before 46ca9dc978923c5e1247a9e9519240ba7ace413c; from 9d71dd0c70099914fcd063135da3c580865e924c before 78d87b72cebe2a993fd5b017e9f14fb6278f2eae; from 9d71dd0c70099914fcd063135da3c580865e924c before ba6f0d1832eeb5eb3a6dc5cb30e0f720b3cb3536; from 9d71dd0c70099914fcd063135da3c580865e924c before 79dd3f1d9dd310c2af89b09c71f34d93973b200f; 9d71dd0c70099914fcd063135da3c580865e924c builds before 5d5602236f5db19e8b337a2cd87a90ace5ea776d	CNA record
linux linux_kernel linux:linux_kernel	from 5.4.1 before 5.10.248; from 5.11 before 5.15.198; from 5.16 before 6.1.161; from 6.2 before 6.6.121; from 6.7 before 6.12.66; from 6.13 before 6.18.6; 5.4; 6.19; and 7 more ranges	NVD

References

References

https://git.kernel.org/stable/c/ebb0dfd718dd31c8d3600612ca4b7207ec3d923a	patch
https://git.kernel.org/stable/c/c3a4316e3c746af415c0fd6c6d489ad13f53714d	patch
https://git.kernel.org/stable/c/46ca9dc978923c5e1247a9e9519240ba7ace413c	patch
https://git.kernel.org/stable/c/78d87b72cebe2a993fd5b017e9f14fb6278f2eae	patch
https://git.kernel.org/stable/c/ba6f0d1832eeb5eb3a6dc5cb30e0f720b3cb3536	patch
https://git.kernel.org/stable/c/79dd3f1d9dd310c2af89b09c71f34d93973b200f	patch
https://git.kernel.org/stable/c/5d5602236f5db19e8b337a2cd87a90ace5ea776d	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.