CVE-2026-93281 wifi: rtw89: fix HE extended capability length check
A missing length check in the rtw89 WiFi driver allows out-of-bounds reads, potentially causing a kernel crash or 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-2026-93281?
CVE-2026-93281 is a 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: rtw89: fix HE extended capability length check
rtw89_mac_check_he_obss_narrow_bw_ru_iter() reads extended capability byte 10, but rejects only datalen values below 10. Byte 10 requires at least 11 bytes.
Require datalen >= 11 before reading data[10].
Which versions are affected by CVE-2026-93281?
How do I fix CVE-2026-93281?
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-2026-93281 being exploited?
There is no known exploitation of CVE-2026-93281 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-93281, DEBIAN-CVE-2026-93281, GHSA-fc4w-fg4f-8x55, UBUNTU-CVE-2026-93281.