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CVE-2022-49479

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

HIGH
8.8
CVSS Score
Published: February 26, 2025 at 02:13 AM UTC
Updated: August 5, 2026 at 09:24 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH8.8
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
5.16 ≤ v < 5.17.145.16 ≤ v < 5.18.35.16 ≤ v < 5.195.18 ≤ v < 5.18.35.16bd1e3e7b693c17a04e7d2bd9119daa482b7c7720
Vendor states this is fixed in ddd426d72aca4054045a9bd3b80a4ce1d398f11f (fixed)
Vendor states this is fixed in ef7f9f894cfd0b2e471206409a529af4a26ddd55 (fixed)
Vendor states this is fixed in fcfe1b5e162bf473c1d47760962cec8523c00466 (fixed)
Vendor states this is fixed in 5.16 (unaffected)
Vendor states this is fixed in 5.17.14 (unaffected)
Vendor states this is fixed in 5.18.3 (unaffected)
Vendor states this is fixed in 5.19 (unaffected)

References (3)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/ddd426d72aca4054045a9bd3b80a4ce1d398f11f
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/ef7f9f894cfd0b2e471206409a529af4a26ddd55
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/fcfe1b5e162bf473c1d47760962cec8523c00466

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHLinux
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-416

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