CVE-2026-90367
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk15th percentile - higher than 15% of all known CVEs
Summary
In the Linux kernel, mt7996_mac_reset_work() in the mt76 wifi driver (mt7996) parked the tx worker and disabled the RX/TX NAPIs before taking dev->mt76.mutex. Since mt76_worker_disable()/_enable() are plain kthread park/unpark, not refcounted, and __mt76_set_channel() toggles the same worker and the MT76_RESET bit under the mutex, an L1 SER racing a channel switch could leave the worker unparked and MT76_RESET cleared while the reset path resets the DMA rings, corrupting descriptors or tokens.
Risk Assessment
DMA descriptor corruption can lead to kernel errors, data loss, or system hangs, especially under hard-to-predict race conditions.
Recommendation
Update the Linux kernel to a version containing the fix that takes the mutex before disabling the tx worker in mt7996_mac_reset_work().
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER mt7996_mac_reset_work() parked the tx worker and disabled the RX/TX NAPIs before taking dev->mt76.mutex. mt76_worker_disable()/_enable() are plain kthread park/unpark, not refcounted, and __mt76_set_channel() toggles the same worker and the MT76_RESET bit under the mutex. An L1 SER racing a channel switch could therefore have the worker unparked and MT76_RESET cleared while the reset path resets the DMA rings, corrupting descriptors or tokens. Take the mutex before disabling the worker, as mt7915 does.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS