CVE-2025-71182
Full vulnerability record from the local CVENow database.
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.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-01-31 12:16:03.463000
Last modified
2026-10-19 19:17:16.013000
View original CVE JSON
{
"id": "CVE-2025-71182",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-01-31T12:16:03.463",
"lastModified": "2026-10-19T19:17:16.013",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: make j1939_session_activate() fail if device is no longer registered\n\nsyzbot is still reporting\n\n unregister_netdevice: waiting for vcan0 to become free. Usage count = 2\n\neven after commit 93a27b5891b8 (\"can: j1939: add missing calls in\nNETDEV_UNREGISTER notification handler\") was added. A debug printk() patch\nfound that j1939_session_activate() can succeed even after\nj1939_cancel_active_session() from j1939_netdev_notify(NETDEV_UNREGISTER)\nhas completed.\n\nSince j1939_cancel_active_session() is processed with the session list lock\nheld, checking ndev->reg_state in j1939_session_activate() with the session\nlist lock held can reliably close the race window."
},
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncan: j1939: hacer que j1939_session_activate() falle si el dispositivo ya no está registrado\n\nsyzbot sigue reportando\n\n unregister_netdevice: waiting for vcan0 to become free. Usage count = 2\n\nincluso después de que el commit 93a27b5891b8 ('can: j1939: añadir llamadas faltantes en el manejador de notificaciones NETDEV_UNREGISTER') fue añadido. Un parche de depuración printk() encontró que j1939_session_activate() puede tener éxito incluso después de que j1939_cancel_active_session() de j1939_netdev_notify(NETDEV_UNREGISTER) se haya completado.\n\nDado que j1939_cancel_active_session() se procesa con el bloqueo de la lista de sesiones mantenido, verificar ndev->reg_state en j1939_session_activate() con el bloqueo de la lista de sesiones mantenido puede cerrar de forma fiable la ventana de carrera."
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