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:

(thread 1) | (thread 2)
smp_execute_task_sg() | sas_task_internal_timedout()
... |
del_timer() |
... | ...
sas_free_task(task) |
kfree(task->slow_task) //FREE|
| task->slow_task->... //USE

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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00024.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

No data.

No data.

No data.

No data.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/117331a2a5227fb4369c2a1f321d3e3e2e2ef8fe cve-icon cve-icon
https://git.kernel.org/stable/c/2e12ce270f0d926085c1209cc90397e307deef97 cve-icon cve-icon
https://git.kernel.org/stable/c/46ba53c30666717cb06c2b3c5d896301cd00d0c0 cve-icon cve-icon
https://git.kernel.org/stable/c/a9e5176ead6de64f572ad5c87a72825d9d3c82ae cve-icon cve-icon
https://git.kernel.org/stable/c/e45a1516d2933703a4823d9db71e17c3abeba24f cve-icon cve-icon
https://git.kernel.org/stable/c/f7a785177611ffc97d645fcbc196e6de6ad2421d cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025100155-CVE-2022-50422-287b@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2022-50422 cve-icon
https://www.cve.org/CVERecord?id=CVE-2022-50422 cve-icon
History

Thu, 02 Oct 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important

Wed, 01 Oct 2025 12:00:00 +0000

Type Values Removed Values Added
Description 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: (thread 1) | (thread 2) smp_execute_task_sg() | sas_task_internal_timedout() ... | del_timer() | ... | ... sas_free_task(task) | kfree(task->slow_task) //FREE| | task->slow_task->... //USE 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.
Title scsi: libsas: Fix use-after-free bug in smp_execute_task_sg()
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-10-01T11:41:55.147Z

Reserved: 2025-09-17T14:53:07.004Z

Link: CVE-2022-50422

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2025-10-01T12:15:33.533

Modified: 2025-10-01T12:15:33.533

Link: CVE-2022-50422

cve-icon Redhat

Severity : Important

Publid Date: 2025-10-01T00:00:00Z

Links: CVE-2022-50422 - Bugzilla

cve-icon OpenCVE Enrichment

No data.