CVE-2026-74313 vduse: hold vduse_lock across IDR lookup in open path
A race condition in the Linux kernel VDUSE driver allows a use-after-free, potentially enabling local attackers to execute code or escalate privileges.
- 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-2026-74313?
CVE-2026-74313 is a high-severity use after free vulnerability in Linux, published on 15 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:
vduse: hold vduse_lock across IDR lookup in open path
vduse_dev_open() looks up struct vduse_dev through the IDR and then acquires dev->lock only after vduse_lock has been dropped.
This leaves a window where a concurrent VDUSE_DESTROY_DEV can remove the same object from the IDR and free it before the open path locks the device, leading to a use-after-free.
Close this race by keeping vduse_lock held until dev->lock has been acquired in the open path, matching the lock ordering already used by the destroy path.
Which versions are affected by CVE-2026-74313?
How do I fix CVE-2026-74313?
Apply the vendor's patch.
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-2026-74313 being exploited?
There is no known exploitation of CVE-2026-74313 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74313, DEBIAN-CVE-2026-74313, GHSA-m274-mg38-f4wj, UBUNTU-CVE-2026-74313.