CVE-2022-49303

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  3. CVE-2022-49303

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

I

n the Linux kernel, the following vulnerability has been resolved: drivers: staging: rtl8192eu: 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() | _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. 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.

References
Link Resource
https://git.kernel.org/stable/c/0fcddf9c7c10202946d5b19409efbdff744fba88 Patch
https://git.kernel.org/stable/c/25cf414b0610fea29d8e045f315648d9007c9a46 Patch
Configurations

Configuration 1 (hide)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

14 Apr 2025, 20:05

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/0fcddf9c7c10202946d5b19409efbdff744fba88 - () https://git.kernel.org/stable/c/0fcddf9c7c10202946d5b19409efbdff744fba88 - Patch
References () https://git.kernel.org/stable/c/25cf414b0610fea29d8e045f315648d9007c9a46 - () https://git.kernel.org/stable/c/25cf414b0610fea29d8e045f315648d9007c9a46 - Patch
First Time Linux linux Kernel
Linux
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drivers: staging: rtl8192eu: 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() | _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.
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CWE CWE-667

26 Feb 2025, 07:01

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 07:01

Updated : 2025-10-01 20:16

NVD link : CVE-2022-49303

Mitre link : CVE-2022-49303

CVE.ORG link : CVE-2022-49303

JSON object : View

Products Affected

linux

CWE
CWE-667

Improper Locking