CVE-2022-49479 mt76: fix tx status related use-after-free race on station removal
A race condition in the mt76 driver allows a use-after-free during station removal, potentially leading to code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-49479?
CVE-2022-49479 is a high-severity use after free vulnerability in Linux kernel, published on 26 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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
Weakness: CWE-416
Which versions are affected by CVE-2022-49479?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49479?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2022-49479 being exploited?
There is no known exploitation of CVE-2022-49479 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-49479, GHSA-jgc9-w6v9-w8rc, UBUNTU-CVE-2022-49479.