CVE-2022-49968: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: ieee802154/adf7242: defer destroy_workqueue call There is a possible race condition (use-after-free) like below (FREE) | (USE) adf7242_remove | adf7242_channel cancel_delayed_work_sync | destroy_workqueue (1) | adf7242_cmd_rx | mod_delayed_work (2) | The root cause for this race is that the upper layer (ieee802154) is unaware of this detaching event and the function adf7242_channel can be called without any checks. To fix this, we can add a flag write at the beginning of adf7242_remove and add flag check in adf7242_channel. Or we can just defer the destructive operation like other commit 3e0588c291d6 ("hamradio: defer ax25 kfree after unregister_netdev") which let the ieee802154_unregister_hw() to handle the synchronization. This patch takes the second option. runs")

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CVSS v3.1 Score

4.7

MEDIUM

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

Weakness Type (CWE)

CWE-362 CWE-362

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.17.19 — 4.18
linux	linux_kernel	4.18.1 — 4.19.258
linux	linux_kernel	4.20 — 5.4.213
linux	linux_kernel	5.5 — 5.10.142
linux	linux_kernel	5.11 — 5.15.66
linux	linux_kernel	5.16 — 5.19.8
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/15f3b89bd521d5770d36a61fc04a77c293138ba6 https://git.kernel.org/stable/c/23a29932715ca43bceb2eae1bdb770995afe7271 https://git.kernel.org/stable/c/9f8558c5c642c62c450c98c99b7d18a709fff485 https://git.kernel.org/stable/c/afe7116f6d3b888778ed6d95e3cf724767b9aedf https://git.kernel.org/stable/c/bed12d7531df1417fc92c691999ff95e03835008 https://git.kernel.org/stable/c/dede80aaf01f4b6e8657d23726cb4a3da226ec4c

Frequently Asked Questions

What is CVE-2022-49968? +

In the Linux kernel, the following vulnerability has been resolved: ieee802154/adf7242: defer destroy_workqueue call There is a possible race condition (use-after-free) like below (FREE) | (USE) adf7242_remove | adf7242_channel cancel_delayed_work_sync | destroy_workqueue (1) | adf7242_cmd_rx | mod_delayed_work (2) | The root cause for this race is that the upper layer (ieee802154) is unaware of this detaching event and the function adf7242_channel can be called without any checks. To fix this, we can add a flag write at the beginning of adf7242_remove and add flag check in adf7242_channel. Or we can just defer the destructive operation like other commit 3e0588c291d6 ("hamradio: defer ax25 kfree after unregister_netdev") which let the ieee802154_unregister_hw() to handle the synchronization. This patch takes the second option. runs") It has a CVSS v3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2022-49968? +

CVE-2022-49968 has a CVSS v3.1 score of 4.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2022-49968? +

CVE-2022-49968 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-2022-49968? +

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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CVE-2022-49968