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CVE-2026-98699: wifi: mac80211: fix mesh fast xmit path deletion UAF

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-18 · updated 2026-10-21

Description

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.

Affected products

• Linux kernel: 6.4 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

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

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