wifi: mac80211: fix mesh fast xmit path deletion UAF

{
  "id": "6d79bade61b604e29e4ec9758367845dc3923f601424fd309a4769f66ba63f4c",
  "url": "https://osv.dev/vulnerability/CVE-2026-98699",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: mac80211: fix mesh fast xmit path deletion UAF",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix mesh fast xmit path deletion UAF mesh_fast_tx_cache() stores raw mesh_path pointers. Path deletion flushes the cache and then frees the path with kfree_rcu(), but a lookup that already holds the path can insert a new cache entry after the flush. The cache then points at freed memory. Set MESH_PATH_DELETED before flushing, and skip inserting a cache entry if the path or MPP path is already deleted. Check this under the cache walk lock so it is ordered with the flush. Use WRITE_ONCE() for the deletion flag updates because the cache check reads flags without taking state_lock.",
    "evidence": "osv:CVE-2026-98699",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.113",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.56",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98699",
      "aliases": [
        "CVE-2026-98699"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "d5edb9ae8d568745f893c5c5fa3837d85311b131"
                },
                {
                  "fixed": "ebb7cba623d38733d33d79a8c7442f5ea04c0fb0"
                },
                {
                  "fixed": "0117f1aa189495e6f1ff608681678817995aee39"
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                {
                  "fixed": "128e800a41270ab197b1cc8043637a2924865608"
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                {
                  "fixed": "93da3ec938bfdcfb3899428f04c6d0c56fe32952"
                },
                {
                  "fixed": "ee3aadc43ea69d98f666431e787137ac0badbb85"
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              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98699.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.4.0"
                },
                {
                  "fixed": "6.6.160"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
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                {
                  "fixed": "6.12.113"
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
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                {
                  "fixed": "6.18.56"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
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                {
                  "fixed": "7.2.10"
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              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98699.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.787768320Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0117f1aa189495e6f1ff608681678817995aee39",
        "https://git.kernel.org/stable/c/128e800a41270ab197b1cc8043637a2924865608",
        "https://git.kernel.org/stable/c/93da3ec938bfdcfb3899428f04c6d0c56fe32952",
        "https://git.kernel.org/stable/c/ebb7cba623d38733d33d79a8c7442f5ea04c0fb0",
        "https://git.kernel.org/stable/c/ee3aadc43ea69d98f666431e787137ac0badbb85",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98699.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98699",
        "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/2026/98xxx/CVE-2026-98699.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98699",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 513909,
  "published_at": "2026-10-18T15:46:29.245+00:00"
}