CVE-2026-68407 wifi: nl80211: free RNR data on MBSSID mismatch
A memory leak in the Linux kernel Wi-Fi subsystem allows attackers to cause denial of service by triggering MBSSID mismatches.
- 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-2026-68407?
CVE-2026-68407 is a memory corruption 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: nl80211: free RNR data on MBSSID mismatch
nl80211_parse_beacon() rejects EMA RNR data when there are fewer RNR entries than MBSSID entries.
The rejected RNR allocation has not been attached to the beacon data yet, so free it before returning the error.
Which versions are affected by CVE-2026-68407?
How do I fix CVE-2026-68407?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-68407 being exploited?
There is no known exploitation of CVE-2026-68407 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68407, DEBIAN-CVE-2026-68407, GHSA-q45f-88jj-8hfj, UBUNTU-CVE-2026-68407.