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". 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.

• linux linux kernel (>= 2.6.19 < 5.4.220) • linux linux kernel (>= 5.5 < 5.10.150) • linux linux kernel (>= 5.11 < 5.15.75) • linux linux kernel (>= 5.16 < 5.19.17) • linux linux kernel (>= 6.0 < 6.0.3)