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CVE-2022-49493

Estado: ModificadaAlta (7.8)—

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

ASoC: rt5645: Fix errorenous cleanup order

There is a logic error when removing rt5645 device as the function rt5645_i2c_remove() first cancel the &rt5645->jack_detect_work and delete the &rt5645->btn_check_timer latter. However, since the timer handler rt5645_btn_check_callback() will re-queue the jack_detect_work, this cleanup order is buggy.

That is, once the del_timer_sync in rt5645_i2c_remove is concurrently run with the rt5645_btn_check_callback, the canceled jack_detect_work will be rescheduled again, leading to possible use-after-free.

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This patch fix the issue by placing the del_timer_sync function before the cancel_delayed_work_sync.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de acceso local (AV:L/PR:L) en kernel Linux que permite escalada mediante use-after-free en manejador de temporizador, ejecutando código con privilegios elevados (C:H/I:H/A:H).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

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\nASoC: rt5645: Fix errorenous cleanup order\n\nThere is a logic error when removing rt5645 device as the function\nrt5645_i2c_remove() first cancel the &rt5645->jack_detect_work and\ndelete the &rt5645->btn_check_timer latter. However, since the timer\nhandler rt5645_btn_check_callback() will re-queue the jack_detect_work,\nthis cleanup order is buggy.\n\nThat is, once the del_timer_sync in rt5645_i2c_remove is concurrently\nrun with the rt5645_btn_check_callback, the canceled jack_detect_work\nwill be rescheduled again, leading to possible use-after-free.\n\nThis patch fix the issue by placing the del_timer_sync function before\nthe cancel_delayed_work_sync."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ASoC: rt5645: Se corrige el orden de depuración erróneo Hay un error lógico al eliminar el dispositivo rt5645, ya que la función rt5645_i2c_remove() primero cancela &rt5645->jack_detect_work y elimina &rt5645->btn_check_timer después. Sin embargo, dado que el controlador del temporizador rt5645_btn_check_callback() volverá a poner en cola jack_detect_work, este orden de limpieza tiene errores. Es decir, una vez que del_timer_sync en rt5645_i2c_remove se ejecuta simultáneamente con rt5645_btn_check_callback, el jack_detect_work cancelado se reprogramará nuevamente, lo que provocará un posible use-after-free. Este parche soluciona el problema colocando la función del_timer_sync antes de cancel_delayed_work_sync."
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