CVE-2026-19380 Mullvad wireguard.sys IOCTL AdapterState reference count
A local attacker can exploit a reference count error in the Mullvad WireGuard kernel driver to achieve privilege escalation or code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19380?
CVE-2026-19380 is a medium-severity use after free vulnerability in Mullvad wireguard.sys, 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
A vulnerability was identified in Mullvad wireguard.sys 0.10.1. The affected element is the function AdapterState of the component IOCTL Handler. Such manipulation leads to improper update of reference count. Local access is required to approach this attack. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.
Which versions are affected by CVE-2026-19380?
How do I fix CVE-2026-19380?
No fix has been published for CVE-2026-19380 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-19380 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19380 exists.
Sources
Also known as GHSA-vfrx-fwf3-jfq2.