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CVE-2025-71182

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_netdev…

Published Jan 31, 2026EPSS 0.18%

Overview

CVE-2025-71182 is a medium-severity vulnerability. It was published on January 31, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/46ca9dc978923c5e1247a9e9519240ba7ace413cRefgit.kernel.org/stable/c/5d5602236f5db19e8b337a2cd87a90ace5ea776dRefgit.kernel.org/stable/c/78d87b72cebe2a993fd5b017e9f14fb6278f2eaeRefgit.kernel.org/stable/c/79dd3f1d9dd310c2af89b09c71f34d93973b200fRefgit.kernel.org/stable/c/ba6f0d1832eeb5eb3a6dc5cb30e0f720b3cb3536Refgit.kernel.org/stable/c/c3a4316e3c746af415c0fd6c6d489ad13f53714dRefgit.kernel.org/stable/c/ebb0dfd718dd31c8d3600612ca4b7207ec3d923a

How CyberStrike helps

Frequently asked questions

What is CVE-2025-71182?

CVE-2025-71182 is a medium-severity vulnerability. It was published on January 31, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-71182?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-71182?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-71182?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-71182 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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