CVE-2022-50422: linux kernel Use-After-Free — Fix

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
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

References

Advisories & Patches

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

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-50422? +

CVE-2022-50422 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-50422? +

CVE-2022-50422 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-50422? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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