Linux Kernel up to 5.17.13/5.18.2 mt76_sta_pre_rcu_remove use after free

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.17.13/5.18.2 and classified as critical. This issue affects the function mt76_sta_pre_rcu_remove. Executing a manipulation can lead to use after free. This vulnerability is registered as CVE-2022-49479. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.17.13/5.18.2. It has been declared as critical. This vulnerability affects the function mt76_sta_pre_rcu_remove. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: mt76: fix tx status related use-after-free race on station removal There is a small race window where ongoing tx activity can lead to a skb getting added to the status tracking idr after that idr has already been cleaned up, which will keep the wcid linked in the status poll list. Fix this by only adding status skbs if the wcid pointer is still assigned in dev->wcid, which gets cleared early by mt76_sta_pre_rcu_remove

The advisory is available at git.kernel.org. This vulnerability was named CVE-2022-49479 since 02/26/2025. The exploitation appears to be easy. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/25/2025).

Upgrading to version 5.17.14 or 5.18.3 eliminates this vulnerability. Applying the patch ef7f9f894cfd0b2e471206409a529af4a26ddd55/ddd426d72aca4054045a9bd3b80a4ce1d398f11f/fcfe1b5e162bf473c1d47760962cec8523c00466 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.17.0
• 5.17.1
• 5.17.2
• 5.17.3
• 5.17.4
• 5.17.5
• 5.17.6
• 5.17.7
• 5.17.8
• 5.17.9
• 5.17.10
• 5.17.11
• 5.17.12
• 5.17.13
• 5.18.0
• 5.18.1
• 5.18.2

License

• open-source

Website

• Vendor: https://www.kernel.org/

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CPE 2.2info

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