GHSA-CHRV-C8HF-P9C7

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33
VLAI
Details

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

wifi: brcmfmac: cyw: fix heap overflow on a short auth frame

brcmf_notify_auth_frame_rx() takes the frame length from the firmware event and copies the frame body with the management header offset subtracted:

u32 mgmt_frame_len = e->datalen - sizeof(struct brcmf_rx_mgmt_data);
...
memcpy(&mgmt_frame->u, frame,
       mgmt_frame_len - offsetof(struct ieee80211_mgmt, u));

The only length check is e->datalen >= sizeof(*rxframe), so mgmt_frame_len can be anything from 0 up. offsetof(struct ieee80211_mgmt, u) is 24. When mgmt_frame_len is below that, the subtraction wraps as an unsigned value to a huge length. The memcpy then runs far past the kzalloc'd buffer. A malicious or malfunctioning AP can make the frame short during the external SAE auth exchange, so this is a remotely triggered heap overflow.

Reject frames shorter than the management header offset before the copy.

Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-72003"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:20:53Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: cyw: fix heap overflow on a short auth frame\n\nbrcmf_notify_auth_frame_rx() takes the frame length from the firmware\nevent and copies the frame body with the management header offset\nsubtracted:\n\n\tu32 mgmt_frame_len = e-\u003edatalen - sizeof(struct brcmf_rx_mgmt_data);\n\t...\n\tmemcpy(\u0026mgmt_frame-\u003eu, frame,\n\t       mgmt_frame_len - offsetof(struct ieee80211_mgmt, u));\n\nThe only length check is e-\u003edatalen \u003e= sizeof(*rxframe), so mgmt_frame_len\ncan be anything from 0 up. offsetof(struct ieee80211_mgmt, u) is 24. When\nmgmt_frame_len is below that, the subtraction wraps as an unsigned value to\na huge length. The memcpy then runs far past the kzalloc\u0027d buffer. A\nmalicious or malfunctioning AP can make the frame short during the\nexternal SAE auth exchange, so this is a remotely triggered heap overflow.\n\nReject frames shorter than the management header offset before the copy.",
  "id": "GHSA-chrv-c8hf-p9c7",
  "modified": "2026-08-17T06:33:03Z",
  "published": "2026-08-15T06:32:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72003"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/185bb156c427d0f865d344a6d0eaa02c6d05cc57"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/240c8d2c717b3f8153e7e877b22a82518d78dbdc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/55b26abb1fa1ec406b3ad11b43c49c7624257565"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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