CVE-2022-49493: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: ASoC: rt5645: Fix errorenous cleanup order There is a logic error when removing rt5645 device as the function rt5645_i2c_remove() first cancel the &rt5645->jack_detect_work and delete the &rt5645->btn_check_timer latter. However, since the timer handler rt5645_btn_check_callback() will re-queue the jack_detect_work, this cleanup order is buggy. That is, once the del_timer_sync in rt5645_i2c_remove is concurrently run with the rt5645_btn_check_callback, the canceled jack_detect_work will be rescheduled again, leading to possible use-after-free. This patch fix the issue by placing the del_timer_sync function before the cancel_delayed_work_sync.

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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	< 4.9.318
linux	linux_kernel	4.10 — 4.14.283
linux	linux_kernel	4.15 — 4.19.247
linux	linux_kernel	4.20 — 5.4.198
linux	linux_kernel	5.5 — 5.10.121
linux	linux_kernel	5.11 — 5.15.46
linux	linux_kernel	5.16 — 5.17.14
linux	linux_kernel	5.18 — 5.18.3

References

Advisories & Patches

https://git.kernel.org/stable/c/061a6159cea583f1155f67d1915917a6b9282662 https://git.kernel.org/stable/c/0941150100173d4eaf3fe08ff4b16740e7c3026f https://git.kernel.org/stable/c/1a5a3dfd9f172dcb115072f0aea5e27d3083c20e https://git.kernel.org/stable/c/236d29c5857f02e0a53fdf15d3dce1536c4322ce https://git.kernel.org/stable/c/2def44d3aec59e38d2701c568d65540783f90f2f https://git.kernel.org/stable/c/453f0920ffc1a28e28ddb9c3cd5562472b2895b0 https://git.kernel.org/stable/c/88c09e4812d72c3153afc8e5a45ecac2d0eae3ff https://git.kernel.org/stable/c/abe7554da62cb489712a54de69ef5665c250e564

Frequently Asked Questions

What is CVE-2022-49493? +

In the Linux kernel, the following vulnerability has been resolved: ASoC: rt5645: Fix errorenous cleanup order There is a logic error when removing rt5645 device as the function rt5645_i2c_remove() first cancel the &rt5645->jack_detect_work and delete the &rt5645->btn_check_timer latter. However, since the timer handler rt5645_btn_check_callback() will re-queue the jack_detect_work, this cleanup order is buggy. That is, once the del_timer_sync in rt5645_i2c_remove is concurrently run with the rt5645_btn_check_callback, the canceled jack_detect_work will be rescheduled again, leading to possible use-after-free. This patch fix the issue by placing the del_timer_sync function before the cancel_delayed_work_sync. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-49493? +

CVE-2022-49493 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-2022-49493? +

CVE-2022-49493 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-2022-49493? +

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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