CVE-2026-98699 (GCVE-0-2026-98699)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:46 – Updated: 2026-10-21 12:55
VLAI
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d5edb9ae8d568745f893c5c5fa3837d85311b131 , < ebb7cba623d38733d33d79a8c7442f5ea04c0fb0 (git)
Affected: d5edb9ae8d568745f893c5c5fa3837d85311b131 , < 0117f1aa189495e6f1ff608681678817995aee39 (git)
Affected: d5edb9ae8d568745f893c5c5fa3837d85311b131 , < 128e800a41270ab197b1cc8043637a2924865608 (git)
Affected: d5edb9ae8d568745f893c5c5fa3837d85311b131 , < 93da3ec938bfdcfb3899428f04c6d0c56fe32952 (git)
Affected: d5edb9ae8d568745f893c5c5fa3837d85311b131 , < ee3aadc43ea69d98f666431e787137ac0badbb85 (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "net/mac80211/mesh_pathtbl.c"
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      "cpeApplicability": [
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          "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."
        }
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "wifi: mac80211: fix mesh fast xmit path deletion UAF",
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    "datePublished": "2026-10-18T15:46:29.245Z",
    "dateReserved": "2026-09-25T10:25:14.365Z",
    "dateUpdated": "2026-10-21T12:55:49.005Z",
    "state": "PUBLISHED"
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      "product_status:known_affected": "2",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "wifi: mac80211: fix mesh fast xmit path deletion UAF",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98699.json",
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          }
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    }
  }
}



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