---
id: CVE-2026-90373
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear

  mt7915_remove_interface() cleared the wcid mask bit with no lock held and
  before clearing the R…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear

  mt7915_remove_interface() cleared the wcid mask bit with no lock held and
  before clearing the R…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f3049b88b2b32326df97461813ae73e8bbc296fc <
    5dce25f1d609ba991a9c22c27be586c92f03ed77
  - >-
    Linux >= f3049b88b2b32326df97461813ae73e8bbc296fc <
    b4a41a47a67c788e6b0625fa517ec8872e99bb6c
  - >-
    Linux >= f3049b88b2b32326df97461813ae73e8bbc296fc <
    a97b2b942d2f8f12fbd6a7caafc735d1ad115e6b
  - >-
    Linux >= f3049b88b2b32326df97461813ae73e8bbc296fc <
    6486e11a6e2f679597af2d5bb48c3b07a2b2a7ba
  - Linux 6.12
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:36.503'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90373'
references:
  - url: 'https://git.kernel.org/stable/c/5dce25f1d609ba991a9c22c27be586c92f03ed77'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6486e11a6e2f679597af2d5bb48c3b07a2b2a7ba'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a97b2b942d2f8f12fbd6a7caafc735d1ad115e6b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b4a41a47a67c788e6b0625fa517ec8872e99bb6c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.808Z'
epss: 0.00209
epssPercentile: 0.0982
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear

mt7915_remove_interface() cleared the wcid mask bit with no lock held and
before clearing the RCU wcid pointer. The mask is a non-atomic RMW shared
with the allocators, which all run under dev->mt76.mutex; on DBDC the two
wiphys share one mt76_dev, so this raced add_interface/sta_add on the
other band and could leak or double-hand-out a wcid. Clearing the bit
before the RCU pointer also let a concurrent allocation reuse the index
and publish its wcid, which the subsequent NULL assignment then wiped.
Move the clear into the existing mutex section, after the RCU pointer is
cleared.

## Remediation

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