CVE-2022-50422
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.
How to fix
- linux linux_kernel5.4.220, 5.10.150, 5.15.75, 5.19.17, 6.0.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.19 ≤ v < 5.4.220, 5.5 ≤ v < 5.10.150, 5.11 ≤ v < 5.15.75, 5.16 ≤ v < 5.19.17, 6.0 ≤ v < 6.0.3 | 5.4.220, 5.10.150, 5.15.75, 5.19.17, 6.0.3 |
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