CVE-2026-98699

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References