CVE-2026-23281

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-23281
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.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/03cc8f90d0537fcd4985c3319b4fafbf2e3fb1f0 Patch
https://git.kernel.org/stable/c/09f3c30ab3b1371eaf9676a1b8add57bca763083 Patch
https://git.kernel.org/stable/c/3c5c818c78b03a1725f3dcd566865c77b48dd3a6 Patch
https://git.kernel.org/stable/c/3f9dec4a6d95d7f1f5e9e9dfdfa173c053bba8dc Patch
https://git.kernel.org/stable/c/a9f55b14486426d907459bced5825a25063bd922 Patch
https://git.kernel.org/stable/c/b15e0fa7adb4de3a03aee9e6fc4d83e5cf0a65e4 Patch
https://git.kernel.org/stable/c/d0155fe68f31b339961cf2d4f92937d57e9384e6 Patch
https://git.kernel.org/stable/c/ed7d30f90b77f73a47498686ede83f622b7e4f0d 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
History

22 May 2026, 00:31

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
CWE CWE-416
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
References () https://git.kernel.org/stable/c/03cc8f90d0537fcd4985c3319b4fafbf2e3fb1f0 - () https://git.kernel.org/stable/c/03cc8f90d0537fcd4985c3319b4fafbf2e3fb1f0 - Patch
References () https://git.kernel.org/stable/c/09f3c30ab3b1371eaf9676a1b8add57bca763083 - () https://git.kernel.org/stable/c/09f3c30ab3b1371eaf9676a1b8add57bca763083 - Patch
References () https://git.kernel.org/stable/c/3c5c818c78b03a1725f3dcd566865c77b48dd3a6 - () https://git.kernel.org/stable/c/3c5c818c78b03a1725f3dcd566865c77b48dd3a6 - Patch
References () https://git.kernel.org/stable/c/3f9dec4a6d95d7f1f5e9e9dfdfa173c053bba8dc - () https://git.kernel.org/stable/c/3f9dec4a6d95d7f1f5e9e9dfdfa173c053bba8dc - Patch
References () https://git.kernel.org/stable/c/a9f55b14486426d907459bced5825a25063bd922 - () https://git.kernel.org/stable/c/a9f55b14486426d907459bced5825a25063bd922 - Patch
References () https://git.kernel.org/stable/c/b15e0fa7adb4de3a03aee9e6fc4d83e5cf0a65e4 - () https://git.kernel.org/stable/c/b15e0fa7adb4de3a03aee9e6fc4d83e5cf0a65e4 - Patch
References () https://git.kernel.org/stable/c/d0155fe68f31b339961cf2d4f92937d57e9384e6 - () https://git.kernel.org/stable/c/d0155fe68f31b339961cf2d4f92937d57e9384e6 - Patch
References () https://git.kernel.org/stable/c/ed7d30f90b77f73a47498686ede83f622b7e4f0d - () https://git.kernel.org/stable/c/ed7d30f90b77f73a47498686ede83f622b7e4f0d - Patch

18 Apr 2026, 09:16

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: wifi: libertas: corregir uso después de liberación en lbs_free_adapter() La función lbs_free_adapter() usa timer_delete() (no síncrono) 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 devolución de llamada de temporizador en ejecución se complete. Si una devolución de llamada de temporizador se está ejecutando cuando se llama a lbs_free_adapter(), la devolución de llamada accederá a memoria liberada ya que lbs_cfg_free() libera la estructura contenedora inmediatamente después de que lbs_free_adapter() retorna. Ambas devoluciones de llamada de temporizador (lbs_cmd_timeout_handler y lbs_tx_lockup_handler) acceden a priv->driver_lock, priv->cur_cmd, priv->dev y otros campos, lo que serían todas violaciones de uso después de liberación. Usar timer_delete_sync() en su lugar para asegurar que cualquier devolución de llamada de temporizador en ejecución se haya completado antes de retornar. Este error fue introducido en el commit 8f641d93c38a ('libertas: detectar bloqueos de TX y reiniciar hardware') donde se usó 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.
References
  • () https://git.kernel.org/stable/c/09f3c30ab3b1371eaf9676a1b8add57bca763083 -
  • () https://git.kernel.org/stable/c/b15e0fa7adb4de3a03aee9e6fc4d83e5cf0a65e4 -

25 Mar 2026, 11:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-25 11:16

Updated : 2026-05-22 00:31

NVD link : CVE-2026-23281

Mitre link : CVE-2026-23281

CVE.ORG link : CVE-2026-23281

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

Use After Free