CVE-2022-49479

mt76: fix tx status related use-after-free race on station removal

State: Published
Severity: 8.8 High
Published: Feb 26, 2025
Updated: Aug 5, 2026
Reserved: Feb 26, 2025

Description

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

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	bd1e3e7b693c17a04e7d2bd9119daa482b7c7720 to before ef7f9f894cfd0b2e471206409a529af4a26ddd55Affected bd1e3e7b693c17a04e7d2bd9119daa482b7c7720 to before ddd426d72aca4054045a9bd3b80a4ce1d398f11fAffected bd1e3e7b693c17a04e7d2bd9119daa482b7c7720 to before fcfe1b5e162bf473c1d47760962cec8523c00466Affected
LinuxLinux	5.16Affected before 5.16Not affected 5.17.14 through 5.17.Not affected 5.18.3 through 5.18.Not affected 5.19 and laterNot affected

References

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