CVE-2026-68406 wifi: cfg80211: validate PMSR FTM preamble range
A missing validation in the Linux kernel WiFi driver allows local attackers to bypass security checks, potentially leading to privilege escalation or system crashes.
- 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-2026-68406?
CVE-2026-68406 is a missing authorization vulnerability in Linux, published on 10 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: cfg80211: validate PMSR FTM preamble range
PMSR FTM request parsing accepts preamble values outside the enumerated nl80211 preamble range.
Reject out-of-range values before using them in the parser capability bit test using the policy.
[drop unnecessary check]
Which versions are affected by CVE-2026-68406?
How do I fix CVE-2026-68406?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-68406 being exploited?
There is no known exploitation of CVE-2026-68406 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68406, DEBIAN-CVE-2026-68406, GHSA-4fpv-jc67-f9w9, UBUNTU-CVE-2026-68406.