CVE-2026-98327 wifi: mac80211: mesh: reset the CSA state when leaving
A memory leak in the Linux kernel's mac80211 mesh networking code allows attackers to cause a denial of service by leaving a mesh network during a channel switch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98327?
CVE-2026-98327 is a memory corruption vulnerability in Linux, published on 6 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: mesh: reset the CSA state when leaving
ifmsh->csa is allocated in ieee80211_mesh_csa_beacon() and only freed in ieee80211_mesh_finish_csa(), i.e. when the channel switch completes. Leaving the mesh while a switch is still pending therefore leaks it.
Additionally, ifmsh->csa_role and ifmsh->chsw_ttl have their state leak in this case, so things can get mixed up in addition to the memory leak.
Refactor the reset and call it in ieee80211_stop_mesh() to fix it all.
Which versions are affected by CVE-2026-98327?
How do I fix CVE-2026-98327?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-98327 being exploited?
There is no known exploitation of CVE-2026-98327 in the wild and no public exploit code.
Sources
Also known as AZL-106248, BELL-CVE-2026-98327, DEBIAN-CVE-2026-98327, GHSA-6v32-hcc5-q9w8, UBUNTU-CVE-2026-98327.