7.8

CVE-2022-50422

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 2.6.19 < 5.4.220
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.150
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.75
Linux ≫ Linux Kernel Version >= 5.16 < 5.19.17
Linux ≫ Linux Kernel Version >= 6.0 < 6.0.3
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.15% 0.046
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
134c704f-9b21-4f2e-91b3-4a467353bcc0 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/117331a2a5227fb4369c2a1f321d3e3e2e2ef8fe
Patch
https://git.kernel.org/stable/c/2e12ce270f0d926085c1209cc90397e307deef97
Patch
https://git.kernel.org/stable/c/46ba53c30666717cb06c2b3c5d896301cd00d0c0
Patch
https://git.kernel.org/stable/c/a9e5176ead6de64f572ad5c87a72825d9d3c82ae
Patch
https://git.kernel.org/stable/c/e45a1516d2933703a4823d9db71e17c3abeba24f
Patch
https://git.kernel.org/stable/c/f7a785177611ffc97d645fcbc196e6de6ad2421d
Patch