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CVE-2026-23281

Estado: AnalizadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

wifi: libertas: fix use-after-free in lbs_free_adapter()

The lbs_free_adapter() function uses timer_delete() (non-synchronous) for both command_timer and tx_lockup_timer before the structure is freed. This is incorrect because timer_delete() does not wait for any running timer callback to complete.

If a timer callback is executing when lbs_free_adapter() is called, the callback will access freed memory since lbs_cfg_free() frees the containing structure immediately after lbs_free_adapter() returns.

Both timer callbacks (lbs_cmd_timeout_handler and lbs_tx_lockup_handler) access priv->driver_lock, priv->cur_cmd, priv->dev, and other fields, which would all be use-after-free violations.

Leer descripción completaMostrar menos

Use timer_delete_sync() instead to ensure any running timer callback has completed before returning.

This bug was introduced in commit 8f641d93c38a ("libertas: detect TX lockups and reset hardware") where del_timer() was used instead of del_timer_sync() in the cleanup path. The command_timer has had the same issue since the driver was first written.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad use-after-free (CWE-416) en kernel Linux con acceso local y privilegios de usuario (AV:L/PR:L). El atacante local puede provocar ejecución arbitraria de código explotando callbacks de temporizadores no sincronizados.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: libertas: fix use-after-free in lbs_free_adapter()\n\nThe lbs_free_adapter() function uses timer_delete() (non-synchronous)\nfor both command_timer and tx_lockup_timer before the structure is\nfreed. This is incorrect because timer_delete() does not wait for\nany running timer callback to complete.\n\nIf a timer callback is executing when lbs_free_adapter() is called,\nthe callback will access freed memory since lbs_cfg_free() frees the\ncontaining structure immediately after lbs_free_adapter() returns.\n\nBoth timer callbacks (lbs_cmd_timeout_handler and lbs_tx_lockup_handler)\naccess priv->driver_lock, priv->cur_cmd, priv->dev, and other fields,\nwhich would all be use-after-free violations.\n\nUse timer_delete_sync() instead to ensure any running timer callback\nhas completed before returning.\n\nThis bug was introduced in commit 8f641d93c38a (\"libertas: detect TX\nlockups and reset hardware\") where del_timer() was used instead of\ndel_timer_sync() in the cleanup path. The command_timer has had the\nsame issue since the driver was first written."
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      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nwifi: libertas: corregir uso después de liberación en lbs_free_adapter()\n\nLa función lbs_free_adapter() usa timer_delete() (no síncrono) para command_timer y tx_lockup_timer antes de que la estructura sea liberada. Esto es incorrecto porque timer_delete() no espera a que ninguna devolución de llamada de temporizador en ejecución se complete.\n\nSi una devolución de llamada de temporizador se está ejecutando cuando se llama a lbs_free_adapter(), la devolución de llamada accederá a memoria liberada ya que lbs_cfg_free() libera la estructura contenedora inmediatamente después de que lbs_free_adapter() retorna.\n\nAmbas devoluciones de llamada de temporizador (lbs_cmd_timeout_handler y lbs_tx_lockup_handler) acceden a priv->driver_lock, priv->cur_cmd, priv->dev y otros campos, lo que serían todas violaciones de uso después de liberación.\n\nUsar timer_delete_sync() en su lugar para asegurar que cualquier devolución de llamada de temporizador en ejecución se haya completado antes de retornar.\n\nEste error fue introducido en el commit 8f641d93c38a ('libertas: detectar bloqueos de TX y reiniciar hardware') donde se usó del_timer() en lugar de del_timer_sync() en la ruta de limpieza. El command_timer ha tenido el mismo problema desde que el controlador fue escrito por primera vez."
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