CVE-2022-49479 Information

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

Reference

https://git.kernel.org/stable/c/ddd426d72aca4054045a9bd3b80a4ce1d398f11f https://git.kernel.org/stable/c/ef7f9f894cfd0b2e471206409a529af4a26ddd55 https://git.kernel.org/stable/c/fcfe1b5e162bf473c1d47760962cec8523c00466