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CVE-2022-49311

Estado: ModificadaMedia (5.5)—

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

drivers: staging: rtl8192bs: Fix deadlock in rtw_joinbss_event_prehandle()

There is a deadlock in rtw_joinbss_event_prehandle(), which is shown below:

(Thread 1) | (Thread 2) | _set_timer() rtw_joinbss_event_prehandle()| mod_timer() spin_lock_bh() //(1) | (wait a time) ... | _rtw_join_timeout_handler() del_timer_sync() | spin_lock_bh() //(2) (wait timer to stop) | ...

We hold pmlmepriv->lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need pmlmepriv->lock in position (2) of thread 2. As a result, rtw_joinbss_event_prehandle() will block forever.

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This patch extracts del_timer_sync() from the protection of spin_lock_bh(), which could let timer handler to obtain the needed lock. What`s more, we change spin_lock_bh() to spin_lock_irq() in _rtw_join_timeout_handler() in order to prevent deadlock.

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).

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\ndrivers: staging: rtl8192bs: Fix deadlock in rtw_joinbss_event_prehandle()\n\nThere is a deadlock in rtw_joinbss_event_prehandle(), which is shown\nbelow:\n\n   (Thread 1)                |      (Thread 2)\n                             | _set_timer()\nrtw_joinbss_event_prehandle()|  mod_timer()\n spin_lock_bh() //(1)        |  (wait a time)\n ...                         | _rtw_join_timeout_handler()\n del_timer_sync()            |  spin_lock_bh() //(2)\n (wait timer to stop)        |  ...\n\nWe hold pmlmepriv->lock in position (1) of thread 1 and\nuse del_timer_sync() to wait timer to stop, but timer handler\nalso need pmlmepriv->lock in position (2) of thread 2.\nAs a result, rtw_joinbss_event_prehandle() will block forever.\n\nThis patch extracts del_timer_sync() from the protection of\nspin_lock_bh(), which could let timer handler to obtain\nthe needed lock. What`s more, we change spin_lock_bh() to\nspin_lock_irq() in _rtw_join_timeout_handler() in order to\nprevent deadlock."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drivers: staging: rtl8192bs: Corregir bloqueo en rtw_joinbss_event_prehandle() Hay un bloqueo en rtw_joinbss_event_prehandle(), que se muestra a continuación: (Hilo 1) | (Hilo 2) | _set_timer() rtw_joinbss_event_prehandle()| mod_timer() spin_lock_bh() //(1) | (esperar un tiempo) ... | _rtw_join_timeout_handler() del_timer_sync() | spin_lock_bh() //(2) (esperar a que el temporizador se detenga) | ... Mantenemos pmlmepriv->lock en la posición (1) del hilo 1 y usamos del_timer_sync() para esperar a que el temporizador se detenga, pero el controlador del temporizador también necesita pmlmepriv->lock en la posición (2) del hilo 2. Como resultado, rtw_joinbss_event_prehandle() se bloqueará para siempre. Este parche extrae del_timer_sync() de la protección de spin_lock_bh(), lo que podría permitir que el controlador del temporizador obtenga el bloqueo necesario. Además, cambiamos spin_lock_bh() por spin_lock_irq() en _rtw_join_timeout_handler() para evitar el bloqueo."
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