Riskcovery

CVE-2022-50422

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

State
Published
Severity
7.8 High
Published
Oct 1, 2025
Updated
May 11, 2026
Reserved
Sep 17, 2025

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCISA-ADP

Weaknesses

Affected Products

ProductVersions
LinuxLinux
  • 2908d778ab3e244900c310974e1fc1c69066e450 to before 117331a2a5227fb4369c2a1f321d3e3e2e2ef8feAffected
  • 2908d778ab3e244900c310974e1fc1c69066e450 to before a9e5176ead6de64f572ad5c87a72825d9d3c82aeAffected
  • 2908d778ab3e244900c310974e1fc1c69066e450 to before e45a1516d2933703a4823d9db71e17c3abeba24fAffected
  • 2908d778ab3e244900c310974e1fc1c69066e450 to before f7a785177611ffc97d645fcbc196e6de6ad2421dAffected
  • 2908d778ab3e244900c310974e1fc1c69066e450 to before 2e12ce270f0d926085c1209cc90397e307deef97Affected
  • 2908d778ab3e244900c310974e1fc1c69066e450 to before 46ba53c30666717cb06c2b3c5d896301cd00d0c0Affected
LinuxLinux
  • 2.6.19Affected
  • before 2.6.19Not affected
  • 5.4.220 through 5.4.*Not affected
  • 5.10.150 through 5.10.*Not affected
  • 5.15.75 through 5.15.*Not affected
  • 5.19.17 through 5.19.*Not affected
  • 6.0.3 through 6.0.*Not affected
  • 6.1 and laterNot affected

References

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