Name of the Vulnerable Software and Affected Versions: Linux Kernel versions prior to v5.4.156

Description: A use-after-free (UAF) issue exists in the j1939 netdev start() function, specifically affecting the rx kref of j1939 priv. The actual impact and attack plausibility have not yet been proven.

Recommendations: For Linux Kernel versions prior to v5.4.156, update to version v5.4.156 or later to resolve the issue. As a temporary workaround, consider restricting access to the j1939 netdev start() function until a patch is available.