CVE-2026-80722 wifi: mac80211: validate individual TWT params before driver setup
A missing validation in the Linux kernel Wi-Fi subsystem allows a remote attacker to cause a denial of service by sending malformed TWT setup frames.
- 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-2026-80722?
CVE-2026-80722 is a high-severity denial of service vulnerability in Linux, published on 28 Aug 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: validate individual TWT params before driver setup
ieee80211_process_rx_twt_action() only partially validates a received S1G TWT setup frame before queueing it.
An individual agreement can therefore reach ieee80211_s1g_rx_twt_setup() with twt->length too short for the full struct ieee80211_twt_params.
The individual path passes twt to drv_add_twt_setup(). Both the tracepoint and the driver callback consume the complete parameters block, not merely req_type. Do not pass a short individual agreement to the driver. Broadcast agreements remain unchanged because they are rejected locally after accessing only req_type.
[edit commit message to not overclaim lack of validation nor understate driver impact]
Which versions are affected by CVE-2026-80722?
How do I fix CVE-2026-80722?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-80722 being exploited?
There is no known exploitation of CVE-2026-80722 in the wild and no public exploit code.
Sources
Also known as AZL-98129, BELL-CVE-2026-80722, DEBIAN-CVE-2026-80722, GHSA-h7fr-f2m3-rhpf, UBUNTU-CVE-2026-80722.