wifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_count_event()

{
  "id": "cb37602d4095efe67acc7dc27599a35e9d24488b93ef2e520d408e68a5182259",
  "url": "https://osv.dev/vulnerability/CVE-2026-90408",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_count_event()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_count_event() There is no policy entry for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT, so the parse infrastructure does not enforce a minimum length for the event struct. Additionally, the num_vdevs field is taken directly from firmware and used as a loop bound over the vdev_ids array without checking that it fits within the TLV payload. Either condition can cause an out-of-bounds read. Add a TLV policy entry for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT so the parse infrastructure enforces a minimum length for the fixed-size event struct. Add a helper ath12k_wmi_tlv_data_len() to recover the payload length of a parsed TLV from the header preceding its data pointer. Use it in ath12k_wmi_process_csa_switch_count_event() to bound num_vdevs before the loop. Compile tested only.",
    "evidence": "osv:CVE-2026-90408",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
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            "value": "6.12.114",
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            "value": "6.18.57",
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            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-90408",
      "aliases": [
        "CVE-2026-90408"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
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              "type": "ECOSYSTEM",
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              "events": [
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                  "introduced": "6.19.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:30.602922032Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/23bed4ef132c55c9016f0c6122c8b8ba2efa2353",
        "https://git.kernel.org/stable/c/24f7cdabea9f7ab95dbd6d8bc9ac6ec48d96a7e5",
        "https://git.kernel.org/stable/c/878654eb78c6aa0ff585baf1376567c775ca28ec",
        "https://git.kernel.org/stable/c/bf97c9d5123859a07848462539153176db029f3a",
        "https://git.kernel.org/stable/c/d4aec20f3a84634171c139ab2e02bb2e5a5c756b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90408.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90408",
        "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/2026/90xxx/CVE-2026-90408.json"
      }
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    "related_cves": [
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        "value": "CVE-2026-90408",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497752,
  "published_at": "2026-09-17T16:09:36.089+00:00"
}