CVE-2026-93793 wifi: iwlwifi: mvm: validate TX_CMD response layout
A missing validation in the iwlwifi driver allows malformed TX_CMD responses to cause a denial of service.
- 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-2026-93793?
CVE-2026-93793 is a high-severity denial of service vulnerability in Linux, published on 24 Sep 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: iwlwifi: mvm: validate TX_CMD response layout
TX_CMD parsing uses frame_count to walk status entries and then read the trailing SCD SSN. Make the minimum-length check follow that exact runtime layout calculation before parsing the payload.
For new TX API, reject TX_CMD responses with frame_count != 1 and warn/return in the aggregation handler to document that aggregated accounting is expected via BA notifications.
Which versions are affected by CVE-2026-93793?
How do I fix CVE-2026-93793?
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-2026-93793 being exploited?
There is no known exploitation of CVE-2026-93793 in the wild and no public exploit code.
Sources
Also known as AZL-103553, BELL-CVE-2026-93793, DEBIAN-CVE-2026-93793, GHSA-cv3p-w443-82hj, UBUNTU-CVE-2026-93793.