CVE-2026-80938wifi: mt76: mt7615: avoid waiting for mac work under the mt76 mutex

Official description

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7615: avoid waiting for mac work under the mt76 mutex mt7615_suspend() acquired the mt76 mutex and then called cancel_delayed_work_sync() on mac_work. mt7615_mac_work() acquires the same mutex via mt7615_mutex_acquire() at the top of the worker, so if mac_work is already running and blocked on the mutex, the suspend path deadlocks waiting for the work it holds the mutex against. Flush scan_work and mac_work before taking the mutex, matching the suspend paths in mt7921 and mt7925. scan_work only takes the mt76 spinlock, but moving it keeps the sequence consistent. This also keeps mac_work from running over an already suspended HIF, which the previous split (async cancel under the lock, sync cancel after release) would have allowed.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/36c73b86a09f0e51c0f81a75c8945b6c5557ff27
• https://git.kernel.org/stable/c/33d29aeb4c0eede92622a7d04ea492b94c30f089
• https://git.kernel.org/stable/c/ef2ec8b537c3a54e241d693bd03016f80d0d4484
• https://git.kernel.org/stable/c/3114d479f2a1d31b2e6214c395794c6e5715e579
• https://git.kernel.org/stable/c/4506e229b2e468b8c64bcf52c50c41a3bf2e633e
• https://git.kernel.org/stable/c/44be85af3e1772ffb3332feafedad2a73b22854c
• https://git.kernel.org/stable/c/bda8324270b1ac91bfba1df8928e0570e29759e8