CVE-2022-49309

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2022-49309
In the Linux kernel, the following vulnerability has been resolved: drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback() There is a deadlock in rtw_surveydone_event_callback(), which is shown below: (Thread 1) | (Thread 2) | _set_timer() rtw_surveydone_event_callback()| mod_timer() spin_lock_bh() //(1) | (wait a time) ... | rtw_scan_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_surveydone_event_callback() 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() in rtw_scan_timeout_handler() to spin_lock_irq(). Otherwise, spin_lock_bh() will also cause deadlock() in timer handler.

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

References
Link Resource
https://git.kernel.org/stable/c/2c41f5c341853f84b7bc2f32605d4e2782e8c279 Patch
https://git.kernel.org/stable/c/cc7ad0d77b51c872d629bcd98aea463a3c4109e7 Patch
https://git.kernel.org/stable/c/ce129d3efd181da5fd56f4360cc8827122afa67e Patch
https://git.kernel.org/stable/c/f89f6c3ebf69623b8ea48200bd690e9e210335a1 Patch
Configurations

Configuration 1 (hide)

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

17 Mar 2025, 19:57

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CWE CWE-667
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drivers: staging: rtl8723bs: Se corrige el bloqueo en rtw_surveydone_event_callback() Hay un bloqueo en rtw_surveydone_event_callback(), que se muestra a continuación: (Hilo 1) | (Hilo 2) | _set_timer() rtw_surveydone_event_callback()| mod_timer() spin_lock_bh() //(1) | (esperar un tiempo) ... | rtw_scan_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_surveydone_event_callback() 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() en rtw_scan_timeout_handler() a spin_lock_irq(). De lo contrario, spin_lock_bh() también provocará un bloqueo interno (deadlock()) en el controlador del temporizador.
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/2c41f5c341853f84b7bc2f32605d4e2782e8c279 - () https://git.kernel.org/stable/c/2c41f5c341853f84b7bc2f32605d4e2782e8c279 - Patch
References () https://git.kernel.org/stable/c/cc7ad0d77b51c872d629bcd98aea463a3c4109e7 - () https://git.kernel.org/stable/c/cc7ad0d77b51c872d629bcd98aea463a3c4109e7 - Patch
References () https://git.kernel.org/stable/c/ce129d3efd181da5fd56f4360cc8827122afa67e - () https://git.kernel.org/stable/c/ce129d3efd181da5fd56f4360cc8827122afa67e - Patch
References () https://git.kernel.org/stable/c/f89f6c3ebf69623b8ea48200bd690e9e210335a1 - () https://git.kernel.org/stable/c/f89f6c3ebf69623b8ea48200bd690e9e210335a1 - Patch

26 Feb 2025, 07:01

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 07:01

Updated : 2025-03-17 19:57

NVD link : CVE-2022-49309

Mitre link : CVE-2022-49309

CVE.ORG link : CVE-2022-49309

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-667

Improper Locking