FKIE_CVE-2026-23281

Vulnerability from fkie_nvd - Published: 2026-03-25 11:16 - Updated: 2026-04-18 09:16
Severity ?
Summary
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. 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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/03cc8f90d0537fcd4985c3319b4fafbf2e3fb1f0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/09f3c30ab3b1371eaf9676a1b8add57bca763083
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c5c818c78b03a1725f3dcd566865c77b48dd3a6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f9dec4a6d95d7f1f5e9e9dfdfa173c053bba8dc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a9f55b14486426d907459bced5825a25063bd922
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b15e0fa7adb4de3a03aee9e6fc4d83e5cf0a65e4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d0155fe68f31b339961cf2d4f92937d57e9384e6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed7d30f90b77f73a47498686ede83f622b7e4f0d
Impacted products
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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-\u003edriver_lock, priv-\u003ecur_cmd, priv-\u003edev, 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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nwifi: libertas: corregir uso despu\u00e9s de liberaci\u00f3n en lbs_free_adapter()\n\nLa funci\u00f3n lbs_free_adapter() usa timer_delete() (no s\u00edncrono) 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 devoluci\u00f3n de llamada de temporizador en ejecuci\u00f3n se complete.\n\nSi una devoluci\u00f3n de llamada de temporizador se est\u00e1 ejecutando cuando se llama a lbs_free_adapter(), la devoluci\u00f3n de llamada acceder\u00e1 a memoria liberada ya que lbs_cfg_free() libera la estructura contenedora inmediatamente despu\u00e9s 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-\u0026gt;driver_lock, priv-\u0026gt;cur_cmd, priv-\u0026gt;dev y otros campos, lo que ser\u00edan todas violaciones de uso despu\u00e9s de liberaci\u00f3n.\n\nUsar timer_delete_sync() en su lugar para asegurar que cualquier devoluci\u00f3n de llamada de temporizador en ejecuci\u00f3n se haya completado antes de retornar.\n\nEste error fue introducido en el commit 8f641d93c38a (\u0027libertas: detectar bloqueos de TX y reiniciar hardware\u0027) donde se us\u00f3 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."
    }
  ],
  "id": "CVE-2026-23281",
  "lastModified": "2026-04-18T09:16:16.350",
  "metrics": {},
  "published": "2026-03-25T11:16:22.657",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/03cc8f90d0537fcd4985c3319b4fafbf2e3fb1f0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/09f3c30ab3b1371eaf9676a1b8add57bca763083"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3c5c818c78b03a1725f3dcd566865c77b48dd3a6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3f9dec4a6d95d7f1f5e9e9dfdfa173c053bba8dc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a9f55b14486426d907459bced5825a25063bd922"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b15e0fa7adb4de3a03aee9e6fc4d83e5cf0a65e4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d0155fe68f31b339961cf2d4f92937d57e9384e6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ed7d30f90b77f73a47498686ede83f622b7e4f0d"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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