---
id: CVE-2026-68197
title: 'wifi: mwifiex: fix NULL dereference when the AP has HT-cap but no HT-oper'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mwifiex: fix NULL dereference when the AP has HT-cap but no HT-oper

  mwifiex_tdls_add_ht_oper() gates its follow-the-AP-bandwidth path on
  bss_desc->bcn_ht_cap bei…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 396939f94084d5923d558e9f22db48bc51156e47 <
    e1770f7410b4232a0267924f99751dc9c5ca31af
  - >-
    Linux >= 396939f94084d5923d558e9f22db48bc51156e47 <
    8c2058717fd06f05d421c2d3adf1dff3c3abcda1
  - >-
    Linux >= 396939f94084d5923d558e9f22db48bc51156e47 <
    fba7eb7b248ea0618235f504158b685d752a153a
  - >-
    Linux >= 396939f94084d5923d558e9f22db48bc51156e47 <
    eb42c3c8fd479166c42984728754cd779c71fd60
  - >-
    Linux >= 396939f94084d5923d558e9f22db48bc51156e47 <
    45011e4d9ba3f2182e5df64be65888044fa20771
  - >-
    Linux >= 396939f94084d5923d558e9f22db48bc51156e47 <
    9375a4ea4121625ef27a46b74781cda66a5cc61b
  - >-
    Linux >= 396939f94084d5923d558e9f22db48bc51156e47 <
    cca4398aa305c22016d1714f388e2fa6ea4e5ad4
  - >-
    Linux >= 396939f94084d5923d558e9f22db48bc51156e47 <
    c3d68e294cbb6a4090bb219d3dcaca85a011809b
  - Linux 3.16
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:44:24.447783Z'
published: '2026-08-10'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:45:01.610Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-68197'
references:
  - url: 'https://git.kernel.org/stable/c/e1770f7410b4232a0267924f99751dc9c5ca31af'
  - url: 'https://git.kernel.org/stable/c/8c2058717fd06f05d421c2d3adf1dff3c3abcda1'
  - url: 'https://git.kernel.org/stable/c/fba7eb7b248ea0618235f504158b685d752a153a'
  - url: 'https://git.kernel.org/stable/c/eb42c3c8fd479166c42984728754cd779c71fd60'
  - url: 'https://git.kernel.org/stable/c/45011e4d9ba3f2182e5df64be65888044fa20771'
  - url: 'https://git.kernel.org/stable/c/9375a4ea4121625ef27a46b74781cda66a5cc61b'
  - url: 'https://git.kernel.org/stable/c/cca4398aa305c22016d1714f388e2fa6ea4e5ad4'
  - url: 'https://git.kernel.org/stable/c/c3d68e294cbb6a4090bb219d3dcaca85a011809b'
tags:
  - cve.org
epss: 0.00216
epssPercentile: 0.12143
ingestedAt: '2026-11-06T16:57:43.134Z'
---

## Overview

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

wifi: mwifiex: fix NULL dereference when the AP has HT-cap but no HT-oper

mwifiex_tdls_add_ht_oper() gates its follow-the-AP-bandwidth path on
bss_desc->bcn_ht_cap being present, but then dereferences a different
pointer, bss_desc->bcn_ht_oper:

	if (ISSUPP_CHANWIDTH40(priv->adapter->hw_dot_11n_dev_cap) &&
	    bss_desc->bcn_ht_cap &&
	    ISALLOWED_CHANWIDTH40(bss_desc->bcn_ht_oper->ht_param))

bcn_ht_cap and bcn_ht_oper are populated independently while parsing the
associated AP's beacon in mwifiex_update_bss_desc_with_ie(): an AP that
advertises an HT Capabilities element but no HT Operation element leaves
bcn_ht_cap non-NULL and bcn_ht_oper NULL. Setting up a TDLS link to a
peer while associated to such an AP then dereferences the NULL
bcn_ht_oper and crashes the kernel. Every other bcn_ht_oper user in the
driver NULL-checks it first.

Guard on the pointer that is actually dereferenced.

Found by 0sec automated security-research tooling (https://0sec.ai).

## Affected

- `Linux >= 396939f94084d5923d558e9f22db48bc51156e47 < e1770f7410b4232a0267924f99751dc9c5ca31af`
- `Linux >= 396939f94084d5923d558e9f22db48bc51156e47 < 8c2058717fd06f05d421c2d3adf1dff3c3abcda1`
- `Linux >= 396939f94084d5923d558e9f22db48bc51156e47 < fba7eb7b248ea0618235f504158b685d752a153a`
- `Linux >= 396939f94084d5923d558e9f22db48bc51156e47 < eb42c3c8fd479166c42984728754cd779c71fd60`
- `Linux >= 396939f94084d5923d558e9f22db48bc51156e47 < 45011e4d9ba3f2182e5df64be65888044fa20771`
- `Linux >= 396939f94084d5923d558e9f22db48bc51156e47 < 9375a4ea4121625ef27a46b74781cda66a5cc61b`
- `Linux >= 396939f94084d5923d558e9f22db48bc51156e47 < cca4398aa305c22016d1714f388e2fa6ea4e5ad4`
- `Linux >= 396939f94084d5923d558e9f22db48bc51156e47 < c3d68e294cbb6a4090bb219d3dcaca85a011809b`
- `Linux 3.16`

## Remediation

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