---
id: CVE-2026-90344
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mac80211: disconnect on CSA to channel 0

  The refactor for the CSA parsing erroneously equates channel
  zero and no information present, leading it to ignore a CSA…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mac80211: disconnect on CSA to channel 0

  The refactor for the CSA parsing erroneously equates channel
  zero and no information present, leading it to ignore a CSA…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 21c3f8f95554feff9bed15703e89adbe582e0383 <
    099aadb2012d7490bc584cc5075ef11cbc33f2c3
  - >-
    Linux >= 21c3f8f95554feff9bed15703e89adbe582e0383 <
    e7bc5ab93acd1c3f54feeb9fa19ead3530168090
  - >-
    Linux >= 21c3f8f95554feff9bed15703e89adbe582e0383 <
    eef374088450bb91626e133c7172b8a0e969a522
  - >-
    Linux >= 21c3f8f95554feff9bed15703e89adbe582e0383 <
    cf57f0a674cc3e3cda1a789359cc1238b61b9d7d
  - Linux 6.9
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:33.103'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90344'
references:
  - url: 'https://git.kernel.org/stable/c/099aadb2012d7490bc584cc5075ef11cbc33f2c3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cf57f0a674cc3e3cda1a789359cc1238b61b9d7d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e7bc5ab93acd1c3f54feeb9fa19ead3530168090'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/eef374088450bb91626e133c7172b8a0e969a522'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.817Z'
epss: 0.00209
epssPercentile: 0.09818
---

## Overview

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

wifi: mac80211: disconnect on CSA to channel 0

The refactor for the CSA parsing erroneously equates channel
zero and no information present, leading it to ignore a CSA
on an AP that advertises a switch to that (invalid) channel.
This leads to not disconnecting, which we should. For Intel
devices, this can lead to a firmware crash.

Fix this by using an int type for the channel number as well
as the opclass, and using a (negative) value that cannot be
encoded in the element to indicate it's not present.

## Remediation

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