GHSA-FW9R-2MHQ-C5MQ

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32
VLAI
Details

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).

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68197"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:07Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mwifiex: fix NULL dereference when the AP has HT-cap but no HT-oper\n\nmwifiex_tdls_add_ht_oper() gates its follow-the-AP-bandwidth path on\nbss_desc-\u003ebcn_ht_cap being present, but then dereferences a different\npointer, bss_desc-\u003ebcn_ht_oper:\n\n\tif (ISSUPP_CHANWIDTH40(priv-\u003eadapter-\u003ehw_dot_11n_dev_cap) \u0026\u0026\n\t    bss_desc-\u003ebcn_ht_cap \u0026\u0026\n\t    ISALLOWED_CHANWIDTH40(bss_desc-\u003ebcn_ht_oper-\u003eht_param))\n\nbcn_ht_cap and bcn_ht_oper are populated independently while parsing the\nassociated AP\u0027s beacon in mwifiex_update_bss_desc_with_ie(): an AP that\nadvertises an HT Capabilities element but no HT Operation element leaves\nbcn_ht_cap non-NULL and bcn_ht_oper NULL. Setting up a TDLS link to a\npeer while associated to such an AP then dereferences the NULL\nbcn_ht_oper and crashes the kernel. Every other bcn_ht_oper user in the\ndriver NULL-checks it first.\n\nGuard on the pointer that is actually dereferenced.\n\nFound by 0sec automated security-research tooling (https://0sec.ai).",
  "id": "GHSA-fw9r-2mhq-c5mq",
  "modified": "2026-08-19T18:32:10Z",
  "published": "2026-08-10T15:33:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68197"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45011e4d9ba3f2182e5df64be65888044fa20771"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c2058717fd06f05d421c2d3adf1dff3c3abcda1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9375a4ea4121625ef27a46b74781cda66a5cc61b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c3d68e294cbb6a4090bb219d3dcaca85a011809b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cca4398aa305c22016d1714f388e2fa6ea4e5ad4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e1770f7410b4232a0267924f99751dc9c5ca31af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb42c3c8fd479166c42984728754cd779c71fd60"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fba7eb7b248ea0618235f504158b685d752a153a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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