kernel: mt76: fix use-after-free by removing a non-RCU wcid pointer

A vulnerability was found in the Linux kernel's mt76 wi-fi driver. A concurrency bug causes the mtxq TX queue to maintain a raw pointer to a wcid structure mtxq-wcid that might be freed by the time it is accessed. This issue can lead to a use-after-free scenario, leading to system instability,...

CVE-2022-49328

CVE-2022-49328 is a vulnerability in the Linux kernel mt76 driver where a use-after-free can occur in mt76_txq_schedule due to an unprotected wcid pointer (non-RCU). The issue is addressed by guarding the mtxq->wcid with an rcu_lock between mt76_txq_schedule and sta_info_alloc/free, per the re...