CVE-2022-50422

Estado: ModificadaAlta (7.8)—

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

scsi: libsas: Fix use-after-free bug in smp_execute_task_sg()

When executing SMP task failed, the smp_execute_task_sg() calls del_timer() to delete "slow_task->timer". However, if the timer handler sas_task_internal_timedout() is running, the del_timer() in smp_execute_task_sg() will not stop it and a UAF will happen. The process is shown below:

Leer descripción completaMostrar menos

Fix by calling del_timer_sync() in smp_execute_task_sg(), which makes sure the timer handler have finished before the "task->slow_task" is deallocated.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.16%
Percentil entre todas las CVEs puntuadas: 5
Fecha de la puntuación: 5/10/2026

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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1059 Command and Scripting Interpreterexecution65 %

CWE-416 (use-after-free) con AV:L/PR:L permite escalada local; el kernel de Linux ejecuta código en contexto privilegiado.

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 Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416
CWE-416

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libsas: Fix use-after-free bug in smp_execute_task_sg()\n\nWhen executing SMP task failed, the smp_execute_task_sg() calls del_timer()\nto delete \"slow_task->timer\". However, if the timer handler\nsas_task_internal_timedout() is running, the del_timer() in\nsmp_execute_task_sg() will not stop it and a UAF will happen. The process\nis shown below:\n\n      (thread 1)               |        (thread 2)\nsmp_execute_task_sg()          | sas_task_internal_timedout()\n ...                           |\n del_timer()                   |\n ...                           |  ...\n sas_free_task(task)           |\n  kfree(task->slow_task) //FREE|\n                               |  task->slow_task->... //USE\n\nFix by calling del_timer_sync() in smp_execute_task_sg(), which makes sure\nthe timer handler have finished before the \"task->slow_task\" is\ndeallocated."
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