What’s Vulnerable › Vulnerabilities

CVE-2026-90367: wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-21

Description

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.

Affected products

• Linux kernel: 6.4 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/594c4b7f89f9ea75dc9c50b5e4c4296db4a3d701
• https://git.kernel.org/stable/c/6190db312b8230813f529f014b26247c6d9800d0
• https://git.kernel.org/stable/c/69f23622533a4f054b5c8fdb226c3319ffa017b6
• https://git.kernel.org/stable/c/906ad486ba5c4933d82e1ebe0685656390a48450
• https://git.kernel.org/stable/c/bc4f4389f439e808185778d298da36976d13d415

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