FKIE_CVE-2025-71182

Vulnerability from fkie_nvd - Published: 2026-01-31 12:16 - Updated: 2026-03-25 19:41
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/46ca9dc978923c5e1247a9e9519240ba7ace413cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5d5602236f5db19e8b337a2cd87a90ace5ea776dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/78d87b72cebe2a993fd5b017e9f14fb6278f2eaePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/79dd3f1d9dd310c2af89b09c71f34d93973b200fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ba6f0d1832eeb5eb3a6dc5cb30e0f720b3cb3536Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c3a4316e3c746af415c0fd6c6d489ad13f53714dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ebb0dfd718dd31c8d3600612ca4b7207ec3d923aPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.4
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
To clipboard 

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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-\u003ereg_state in j1939_session_activate() with the session\nlist lock held can reliably close the race window."
    },
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      "lang": "es",
      "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 est\u00e1 registrado\n\nsyzbot sigue reportando\n\n  unregister_netdevice: waiting for vcan0 to become free. Usage count = 2\n\nincluso despu\u00e9s de que el commit 93a27b5891b8 (\u0027can: j1939: a\u00f1adir llamadas faltantes en el manejador de notificaciones NETDEV_UNREGISTER\u0027) fue a\u00f1adido. Un parche de depuraci\u00f3n printk() encontr\u00f3 que j1939_session_activate() puede tener \u00e9xito incluso despu\u00e9s 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-\u0026gt;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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  "id": "CVE-2025-71182",
  "lastModified": "2026-03-25T19:41:58.970",
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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