CVE-2026-98705wifi: mac80211: account proxy paths against the mesh path limit

Official description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: account proxy paths against the mesh path limit Proxy-path churn can drive the interface path counter negative and let later mesh path additions exceed MESH_MAX_MPATHS. mesh_path_free_rcu() decrements the interface mpaths counter for entries from both the mesh and proxy path tables, but mpp_path_add() never reserves a slot in that counter. Removing or expiring a proxy path therefore returns a slot that was never charged. mesh_path_add() uses the same counter to enforce MESH_MAX_MPATHS, so once it falls below the number of installed paths the limit no longer holds. Reserve the shared quota before allocating a proxy path and release it on every unsuccessful addition. Mesh and proxy paths now share one 1024-entry budget, so mpp_path_add() can return -ENOSPC at that limit.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/0e79c9d260862bd4676955d3cac7baa0d38a5b2e
• https://git.kernel.org/stable/c/bfd447ee32f727e535e317aa5a8447488f943803
• https://git.kernel.org/stable/c/7f83dab0045f756a82a15ac751165aefa03bed11
• https://git.kernel.org/stable/c/c66ab4b94bb04c162485759196555e08c0965320
• https://git.kernel.org/stable/c/df072db65fdaa34ad15e1d66fc06a53e3e97f778
• https://git.kernel.org/stable/c/3b75831ceee76d32bb8e7ddd241904f92f9b5407
• https://git.kernel.org/stable/c/5a32409ed34a1868830899a5d2437f0b3bf3532c
• https://git.kernel.org/stable/c/a5f35d4b112af1415ff06bd501c8cc26cc08aa8b