---
id: CVE-2026-99060
title: 'wifi: mt76: mt7603: initialize global station WCID'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mt76: mt7603: initialize global station WCID

  mt7603 uses a driver-private global station WCID for frames that have
  neither a station nor a vif, including frames …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d2defcddfe90b3be0cfccc2482495ab1fb759586 <
    99b8bd6323e6fc69615af828522878b7acb77bff
  - >-
    Linux >= 0335c034e7265d36d956e806f33202c94a8a9860 <
    e454ec553996f21085657c96c8a605e2d89a81a6
  - >-
    Linux >= 0335c034e7265d36d956e806f33202c94a8a9860 <
    dd117d17e8aa2e89f857fb708e5b770709fb81cb
  - >-
    Linux >= 0335c034e7265d36d956e806f33202c94a8a9860 <
    19d6fa087dcf242223645828b8282d4040bad168
  - >-
    Linux >= 0335c034e7265d36d956e806f33202c94a8a9860 <
    456de496b53ae73e6e3020fec815dbdc88aa7c07
  - Linux >= 6.6.48 < 6.6.160
  - Linux 6.7
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T12:22:49.164Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-99060'
references:
  - url: 'https://git.kernel.org/stable/c/99b8bd6323e6fc69615af828522878b7acb77bff'
  - url: 'https://git.kernel.org/stable/c/e454ec553996f21085657c96c8a605e2d89a81a6'
  - url: 'https://git.kernel.org/stable/c/dd117d17e8aa2e89f857fb708e5b770709fb81cb'
  - url: 'https://git.kernel.org/stable/c/19d6fa087dcf242223645828b8282d4040bad168'
  - url: 'https://git.kernel.org/stable/c/456de496b53ae73e6e3020fec815dbdc88aa7c07'
tags:
  - cve.org
ingestedAt: '2026-10-23T13:24:55.519Z'
---

## Overview

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

wifi: mt76: mt7603: initialize global station WCID

mt7603 uses a driver-private global station WCID for frames that have
neither a station nor a vif, including frames injected through a monitor
interface. Unlike the core global WCID initialized by
mt76_register_device(), this WCID is published without ever being passed
to mt76_wcid_init().

Since commit 0335c034e726 ("wifi: mt76: fix race condition related to
checking tx queue fill status"), mt76_tx() queues every such frame on the
WCID's tx_pending or tx_offchannel queue and links its tx_list. The first
injected frame therefore reaches __skb_queue_tail() with an uninitialized
sk_buff_head and dereferences a NULL prev pointer.

Initialize the WCID before publishing it.

The fix was tested on an MT7603 PCIe device. Three wildcard probe requests
were injected through a monitor interface. The hardware queue head and tail
advanced from 0 to 3 and a second radio captured the third request over the
air. No oops or reset occurred. After restoring AP mode, a 150 MB transfer
also completed without a reset.

## Affected

- `Linux >= d2defcddfe90b3be0cfccc2482495ab1fb759586 < 99b8bd6323e6fc69615af828522878b7acb77bff`
- `Linux >= 0335c034e7265d36d956e806f33202c94a8a9860 < e454ec553996f21085657c96c8a605e2d89a81a6`
- `Linux >= 0335c034e7265d36d956e806f33202c94a8a9860 < dd117d17e8aa2e89f857fb708e5b770709fb81cb`
- `Linux >= 0335c034e7265d36d956e806f33202c94a8a9860 < 19d6fa087dcf242223645828b8282d4040bad168`
- `Linux >= 0335c034e7265d36d956e806f33202c94a8a9860 < 456de496b53ae73e6e3020fec815dbdc88aa7c07`
- `Linux >= 6.6.48 < 6.6.160`
- `Linux 6.7`

## Remediation

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