GHSA-5J8P-334X-VH85
Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-21 15:41In 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.
{
"affected": [],
"aliases": [
"CVE-2026-98699"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-18T16:17:23Z",
"severity": null
},
"details": "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.",
"id": "GHSA-5j8p-334x-vh85",
"modified": "2026-10-21T15:41:51Z",
"published": "2026-10-18T18:32:00Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98699"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0117f1aa189495e6f1ff608681678817995aee39"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/128e800a41270ab197b1cc8043637a2924865608"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/93da3ec938bfdcfb3899428f04c6d0c56fe32952"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ebb7cba623d38733d33d79a8c7442f5ea04c0fb0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ee3aadc43ea69d98f666431e787137ac0badbb85"
}
],
"schema_version": "1.4.0",
"severity": []
}
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