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CVE-2025-71182

MEDIUM

5.5

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.

CVE Details

CVSS v3.1 Score5.5

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published1/31/2026

Last Modified3/25/2026

Sourcenvd

Honeypot Sightings0

Affected Products

linux:linux_kernel

References

https://git.kernel.org/stable/c/46ca9dc978923c5e1247a9e9519240ba7ace413c(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://git.kernel.org/stable/c/5d5602236f5db19e8b337a2cd87a90ace5ea776d(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://git.kernel.org/stable/c/78d87b72cebe2a993fd5b017e9f14fb6278f2eae(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://git.kernel.org/stable/c/79dd3f1d9dd310c2af89b09c71f34d93973b200f(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://git.kernel.org/stable/c/ba6f0d1832eeb5eb3a6dc5cb30e0f720b3cb3536(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://git.kernel.org/stable/c/c3a4316e3c746af415c0fd6c6d489ad13f53714d(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

https://git.kernel.org/stable/c/ebb0dfd718dd31c8d3600612ca4b7207ec3d923a(416baaa9-dc9f-4396-8d5f-8c081fb06d67)

IOC Correlations

No correlations recorded

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