wifi: mt76: mt7921/mt7925: fix NULL dereference in CSA beacon

{
  "id": "4ab4a6592f8427b9d3e34bcbc20d30774f45d9db5e1f6fdaa9b6dbad01839e2a",
  "url": "https://osv.dev/vulnerability/CVE-2026-64325",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: mt76: mt7921/mt7925: fix NULL dereference in CSA beacon",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921/mt7925: fix NULL dereference in CSA beacon This patch is based on a BUG as reported by Bongani Hlope at https://lore.kernel.org/all/20260502125824.425d7159@bongani-mini.home.org.za/ When a channel-switch announcement (CSA) beacon is received, cfg80211 queues a wiphy work item that eventually calls mt7921_channel_switch_rx_beacon(). If the station disconnects (or the channel context is otherwise torn down) between the time the work is queued and the time it runs, the driver's dev->new_ctx pointer can already have been cleared to NULL. mt7921_channel_switch_rx_beacon() then dereferences new_ctx unconditionally, triggering a NULL pointer dereference at address 0x0: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:mt7921_channel_switch_rx_beacon+0x1f/0x100 [mt7921_common] The same missing guard exists in mt7925_channel_switch_rx_beacon(), which shares the same code pattern introduced by the same commit. Add an early-return NULL check for dev->new_ctx in both mt7921_channel_switch_rx_beacon() and mt7925_channel_switch_rx_beacon(). When new_ctx is NULL there is no pending channel switch to process, so returning immediately is the correct and safe action. Oops-Analysis: http://oops.fenrus.org/reports/lkml/20260502125824.425d7159@bongani-mini.home.org.za/report.html",
    "evidence": "osv:CVE-2026-64325",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.57",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-64325",
      "aliases": [
        "CVE-2026-64325"
      ],
      "affected": [
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              "type": "GIT",
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                },
                {
                  "fixed": "77e7b127472a191e086e1e0b1b051703f33b1801"
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                {
                  "fixed": "351dd7d2c80d23e56dcce6faa4e62bea5b0877c7"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64325.json"
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        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.14.0"
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                {
                  "fixed": "6.18.57"
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            {
              "type": "ECOSYSTEM",
              "events": [
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64325.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.889686689Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/351dd7d2c80d23e56dcce6faa4e62bea5b0877c7",
        "https://git.kernel.org/stable/c/77e7b127472a191e086e1e0b1b051703f33b1801",
        "https://git.kernel.org/stable/c/d16713c06006669c7162dfab1cedf4cb24429311",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64325.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64325",
        "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/2026/64xxx/CVE-2026-64325.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64325",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 516792,
  "published_at": "2026-07-25T08:49:53.238+00:00"
}