CVE-2026-98699 (GCVE-0-2026-98699)
Vulnerability from cvelistv5
Published
2026-10-18 15:46
Modified
2026-10-21 12:55
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: d5edb9ae8d568745f893c5c5fa3837d85311b131
Version: d5edb9ae8d568745f893c5c5fa3837d85311b131
Version: d5edb9ae8d568745f893c5c5fa3837d85311b131
Version: d5edb9ae8d568745f893c5c5fa3837d85311b131
Version: d5edb9ae8d568745f893c5c5fa3837d85311b131
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/mesh_pathtbl.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.4"
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix mesh fast xmit path deletion UAF\n\nmesh_fast_tx_cache() stores raw mesh_path pointers. Path deletion\nflushes the cache and then frees the path with kfree_rcu(), but a\nlookup that already holds the path can insert a new cache entry\nafter the flush. The cache then points at freed memory.\n\nSet MESH_PATH_DELETED before flushing, and skip inserting a cache\nentry if the path or MPP path is already deleted. Check this under\nthe cache walk lock so it is ordered with the flush. Use WRITE_ONCE()\nfor the deletion flag updates because the cache check reads flags\nwithout taking state_lock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:55:49.005Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ebb7cba623d38733d33d79a8c7442f5ea04c0fb0"
        },
        {
          "url": "https://git.kernel.org/stable/c/0117f1aa189495e6f1ff608681678817995aee39"
        },
        {
          "url": "https://git.kernel.org/stable/c/128e800a41270ab197b1cc8043637a2924865608"
        },
        {
          "url": "https://git.kernel.org/stable/c/93da3ec938bfdcfb3899428f04c6d0c56fe32952"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee3aadc43ea69d98f666431e787137ac0badbb85"
        }
      ],
      "title": "wifi: mac80211: fix mesh fast xmit path deletion UAF",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98699",
    "datePublished": "2026-10-18T15:46:29.245Z",
    "dateReserved": "2026-09-25T10:25:14.365Z",
    "dateUpdated": "2026-10-21T12:55:49.005Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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