CVE-2022-50422
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".
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.16%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.16% probability · 5th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/117331a2a5227fb4369c2a1f321d3e3e2e2ef8fePatch
- https://git.kernel.org/stable/c/2e12ce270f0d926085c1209cc90397e307deef97Patch
- https://git.kernel.org/stable/c/46ba53c30666717cb06c2b3c5d896301cd00d0c0Patch
- https://git.kernel.org/stable/c/a9e5176ead6de64f572ad5c87a72825d9d3c82aePatch
- https://git.kernel.org/stable/c/e45a1516d2933703a4823d9db71e17c3abeba24fPatch
- https://git.kernel.org/stable/c/f7a785177611ffc97d645fcbc196e6de6ad2421dPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.