CVE-2026-93806 wifi: cfg80211: validate assoc response length before status and IE access
A missing length check in the Linux kernel WiFi driver allows attackers to cause a denial of service via malformed association response 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-2026-93806?
CVE-2026-93806 is a high-severity 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: cfg80211: validate assoc response length before status and IE access
cfg80211_rx_assoc_resp() initialises the status and response-IE fields of cfg80211_connect_resp_params from the management frame before proving that the frame is long enough for those offsets. S1G and regular association responses also have different IE offsets, but the S1G path only patched resp_ie after the unsafe initialiser had already run.
Defer resp_ie, resp_ie_len, and status to after the link-iteration loop. Use a bool to remember whether the frame is S1G, then validate the appropriate minimum length and set all three fields in a single if/else block. Funnel short-frame and SME-reject cleanup through a shared free_bss label for the abandon paths.
Which versions are affected by CVE-2026-93806?
How do I fix CVE-2026-93806?
Apply the vendor's patch.
Is CVE-2026-93806 being exploited?
There is no known exploitation of CVE-2026-93806 in the wild and no public exploit code.
Sources
Also known as AZL-103730, BELL-CVE-2026-93806, DEBIAN-CVE-2026-93806, GHSA-73rr-rqr3-fp7p, UBUNTU-CVE-2026-93806.