wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets

{
  "id": "d6fac4d29bbdab14e603e99ab7b26058c8d41d913a62a2e7eac5696d8ad109b3",
  "url": "https://osv.dev/vulnerability/CVE-2026-89524",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets ath6kl_cfg80211_connect_event() subtracts fixed IE offsets from assoc_req_len (-= 4) and assoc_resp_len (-= 6), both u8, with no lower bound. The aggregate check recently added to ath6kl_wmi_connect_event_rx() bounds the declared lengths from above (their sum must fit the received event), but an assoc request/response shorter than its fixed offset still underflows here: the u8 wraps to ~250, and cfg80211_connect_result() / cfg80211_roamed() then treat that wrapped value as the IE length and copy that many bytes out of the small assoc_info buffer to user space via nl80211, disclosing adjacent slab memory. Clamp both lengths to their offsets before subtracting. Found by 0sec (https://0sec.ai) using automated source analysis; the missing lower bound is evident from source. Compile-tested.",
    "evidence": "osv:CVE-2026-89524",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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    "severity": "high",
    "structured": {
      "id": "CVE-2026-89524",
      "aliases": [
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
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      "modified": "2026-10-28T02:30:39.043112711Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/225587bdbf4b0eb5265a71ee4dc183561a1857fc",
        "https://git.kernel.org/stable/c/3bbd05723d15dd06f0560bcd94fbf9a91b5f5613",
        "https://git.kernel.org/stable/c/6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9",
        "https://git.kernel.org/stable/c/8eb73016fb3968cf2db3987a92764563a3af773a",
        "https://git.kernel.org/stable/c/d337213a889705a69735079606d0b4c672b17605",
        "https://git.kernel.org/stable/c/e11d5ae96d5e52cb48fa27c6ad352d766d0322fb",
        "https://git.kernel.org/stable/c/e1330d719c047c4d8190a16be034b29fc601a815",
        "https://git.kernel.org/stable/c/e3619bed5da125713b29ac881dc66f5e06606f88",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89524.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89524",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89524.json"
      }
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    "related_cves": [
      {
        "value": "CVE-2026-89524",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 506733,
  "published_at": "2026-09-11T19:44:05.548+00:00"
}