CVE-2026-98329 wifi: mac80211: don't allow injecting frames wider than the chanctx
A local attacker with monitor interface access can cause a kernel warning or potential denial of service by injecting Wi-Fi frames with invalid bandwidth parameters.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98329?
CVE-2026-98329 is a denial of service 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: don't allow injecting frames wider than the chanctx
Frames injected on a monitor interface can carry a radiotap field requesting a bandwidth, which mac80211 passes down to the driver regardless of the the actual operational bandwidth.
If the bandwidth requested is too wide, that triggers a warning in hwsim:
WARN_ON(hwsim_get_chanwidth(bw) > hwsim_get_chanwidth(confbw))
Drop such frames entirely instead since they cannot be sent.
Which versions are affected by CVE-2026-98329?
How do I fix CVE-2026-98329?
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-2026-98329 being exploited?
There is no known exploitation of CVE-2026-98329 in the wild and no public exploit code.
Sources
Also known as AZL-106415, BELL-CVE-2026-98329, DEBIAN-CVE-2026-98329, GHSA-5g9w-qmxp-3m5f, UBUNTU-CVE-2026-98329.