CVE-2022-50422

HighCVSS 7.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

VendorProductVersions
LinuxLinux>= 2908d778ab3e244900c310974e1fc1c69066e450, < 117331a2a5227fb4369c2a1f321d3e3e2e2ef8fe; >= 2908d778ab3e244900c310974e1fc1c69066e450, < a9e5176ead6de64f572ad5c87a72825d9d3c82ae; >= 2908d778ab3e244900c310974e1fc1c69066e450, < e45a1516d2933703a4823d9db71e17c3abeba24f; >= 2908d778ab3e244900c310974e1fc1c69066e450, < f7a785177611ffc97d645fcbc196e6de6ad2421d; >= 2908d778ab3e244900c310974e1fc1c69066e450, < 2e12ce270f0d926085c1209cc90397e307deef97; >= 2908d778ab3e244900c310974e1fc1c69066e450, < 46ba53c30666717cb06c2b3c5d896301cd00d0c0
LinuxLinux2.6.19

References

Timeline

Published
Oct 1, 2025
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2022-50422: High severity, CVSS 7.8 | Vulnix