CVE-2026-98822 wifi: mac80211: prevent AP VLAN tx from other interfaces
A flaw in Linux kernel mac80211 allows unicast frames sent on one interface to be incorrectly transmitted to stations on other VLANs of the same BSS.
- 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-2026-98822?
CVE-2026-98822 is a missing authorization vulnerability in Linux, published on 18 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: prevent AP VLAN tx from other interfaces
Since the station lookup was factored out of ieee80211_build_hdr(), ieee80211_lookup_ra_sta() uses sta_info_get_bss() for all AP and AP VLAN frames, not only for control port frames. A unicast frame sent on one interface thus matches a station of a different VLAN of the same BSS and is transmitted to it.
Only match stations of the interface the frame is sent on, except for control port frames, since those may be sent for VLAN stations directly on the BSS interface.
Which versions are affected by CVE-2026-98822?
How do I fix CVE-2026-98822?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-98822 being exploited?
There is no known exploitation of CVE-2026-98822 in the wild and no public exploit code.
Sources
Also known as AZL-108993, BELL-CVE-2026-98822, DEBIAN-CVE-2026-98822, GHSA-qq49-42v2-78c9, UBUNTU-CVE-2026-98822.