wifi: mt76: mt7615: avoid waiting for mac work under the mt76 mutex

Overview

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

• Linux >= c6bf20109a3fae92402cb76ad709ec5256bcd169 < 36c73b86a09f0e51c0f81a75c8945b6c5557ff27
• Linux >= c6bf20109a3fae92402cb76ad709ec5256bcd169 < 33d29aeb4c0eede92622a7d04ea492b94c30f089
• Linux >= c6bf20109a3fae92402cb76ad709ec5256bcd169 < ef2ec8b537c3a54e241d693bd03016f80d0d4484
• Linux >= c6bf20109a3fae92402cb76ad709ec5256bcd169 < 3114d479f2a1d31b2e6214c395794c6e5715e579
• Linux >= c6bf20109a3fae92402cb76ad709ec5256bcd169 < 4506e229b2e468b8c64bcf52c50c41a3bf2e633e
• Linux >= c6bf20109a3fae92402cb76ad709ec5256bcd169 < 44be85af3e1772ffb3332feafedad2a73b22854c
• Linux >= c6bf20109a3fae92402cb76ad709ec5256bcd169 < bda8324270b1ac91bfba1df8928e0570e29759e8
• Linux 5.8

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

Vendor advisories

• Red Hat VEX · Moderate · updated 2026-09-14 · vex