fkie_cve-2022-49305
Vulnerability from fkie_nvd
Published
2025-02-26 07:01
Modified
2025-10-01 20:16
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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: drivers: staging: rtl8192u: Fix deadlock in ieee80211_beacons_stop() There is a deadlock in ieee80211_beacons_stop(), which is shown below: (Thread 1) | (Thread 2) | ieee80211_send_beacon() ieee80211_beacons_stop() | mod_timer() spin_lock_irqsave() //(1) | (wait a time) ... | ieee80211_send_beacon_cb() del_timer_sync() | spin_lock_irqsave() //(2) (wait timer to stop) | ... We hold ieee->beacon_lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need ieee->beacon_lock in position (2) of thread 2. As a result, ieee80211_beacons_stop() will block forever. This patch extracts del_timer_sync() from the protection of spin_lock_irqsave(), which could let timer handler to obtain the needed lock.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/042915c1bfedd684c1d98a841794ee203200571aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1fbe033c52480f7954c057510040fa6286c4ea25Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/66f769762f65d957f688f3258755c6ec410bf710Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/806c7b53414934ba2a39449b31fd1a038e500273Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b34cb54923a6e5ddefbaf358c85c922c6ab456e2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b465bb2ebf666116c1ac745cb80c65154dc0d27ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ffc9cab7243f8151be37966301307bfd3cda2db3Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers: staging: rtl8192u: Fix deadlock in ieee80211_beacons_stop()\n\nThere is a deadlock in ieee80211_beacons_stop(), which is shown below:\n\n   (Thread 1)              |      (Thread 2)\n                           | ieee80211_send_beacon()\nieee80211_beacons_stop()   |  mod_timer()\n spin_lock_irqsave() //(1) |  (wait a time)\n ...                       | ieee80211_send_beacon_cb()\n del_timer_sync()          |  spin_lock_irqsave() //(2)\n (wait timer to stop)      |  ...\n\nWe hold ieee-\u003ebeacon_lock in position (1) of thread 1 and use\ndel_timer_sync() to wait timer to stop, but timer handler\nalso need ieee-\u003ebeacon_lock in position (2) of thread 2.\nAs a result, ieee80211_beacons_stop() will block forever.\n\nThis patch extracts del_timer_sync() from the protection of\nspin_lock_irqsave(), which could let timer handler to obtain\nthe needed lock."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drivers: staging: rtl8192u: Corregir bloqueo en ieee80211_beacons_stop() Hay un bloqueo en ieee80211_beacons_stop(), que se muestra a continuaci\u00f3n: (Hilo 1) | (Hilo 2) | ieee80211_send_beacon() ieee80211_beacons_stop() | mod_timer() spin_lock_irqsave() //(1) | (esperar un tiempo) ... | ieee80211_send_beacon_cb() del_timer_sync() | spin_lock_irqsave() //(2) (esperar a que el temporizador se detenga) | ... Mantenemos ieee-\u0026gt;beacon_lock en la posici\u00f3n (1) del hilo 1 y usamos del_timer_sync() para esperar a que el temporizador se detenga, pero el controlador del temporizador tambi\u00e9n necesita ieee-\u0026gt;beacon_lock en la posici\u00f3n (2) del hilo 2. Como resultado, ieee80211_beacons_stop() se bloquear\u00e1 para siempre. Este parche extrae del_timer_sync() de la protecci\u00f3n de spin_lock_irqsave(), lo que podr\u00eda permitir que el controlador del temporizador obtenga el bloqueo necesario."
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  "id": "CVE-2022-49305",
  "lastModified": "2025-10-01T20:16:03.950",
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