https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Fri, 02 Oct 2026 16:34:32 +0000 https://vulnerability.circl.lu/vuln/cve-2025-39925 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>can: j1939: implement NETDEV_UNREGISTER notification handler</p> <p>syzbot is reporting</p> <p>unregister_netdevice: waiting for vcan0 to become free. Usage count = 2</p> <p>problem, for j1939 protocol did not have NETDEV_UNREGISTER notification handler for undoing changes made by j1939_sk_bind().</p> <p>Commit 25fe97cb7620 (&#34;can: j1939: move j1939_priv_put() into sk_destruct callback&#34;) expects that a call to j1939_priv_put() can be unconditionally delayed until j1939_sk_sock_destruct() is called. But we need to call j1939_priv_put() against an extra ref held by j1939_sk_bind() call (as a part of undoing changes made by j1939_sk_bind()) as soon as NETDEV_UNREGISTER notification fires (i.e. before j1939_sk_sock_destruct() is called via j1939_sk_release()). Otherwise, the extra ref on &#34;struct j1939_priv&#34; held by j1939_sk_bind() call prevents &#34;struct net_device&#34; from dropping the usage count to 1; making it impossible for unregister_netdevice() to continue.</p> <p>[mkl: remove space in front of label]</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>can: j1939: implement NETDEV_UNREGISTER notification handler</p> <p>syzbot is reporting</p> <p>unregister_netdevice: waiting for vcan0 to become free. Usage count = 2</p> <p>problem, for j1939 protocol did not have NETDEV_UNREGISTER notification handler for undoing changes made by j1939_sk_bind().</p> <p>Commit 25fe97cb7620 (&#34;can: j1939: move j1939_priv_put() into sk_destruct callback&#34;) expects that a call to j1939_priv_put() can be unconditionally delayed until j1939_sk_sock_destruct() is called. But we need to call j1939_priv_put() against an extra ref held by j1939_sk_bind() call (as a part of undoing changes made by j1939_sk_bind()) as soon as NETDEV_UNREGISTER notification fires (i.e. before j1939_sk_sock_destruct() is called via j1939_sk_release()). Otherwise, the extra ref on &#34;struct j1939_priv&#34; held by j1939_sk_bind() call prevents &#34;struct net_device&#34; from dropping the usage count to 1; making it impossible for unregister_netdevice() to continue.</p> <p>[mkl: remove space in front of label]</p> https://vulnerability.circl.lu/vuln/cve-2025-39925