CVE-2026-80676 Drivers: hv: vmbus: use generic driver_override infrastructure
A race condition in the Linux kernel vmbus driver allows a use-after-free, potentially enabling local attackers to execute code or escalate privileges.
- 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-2026-80676?
CVE-2026-80676 is an use after free vulnerability in Linux, published on 28 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:
Drivers: hv: vmbus: use generic driver_override infrastructure
When a driver is probed through __driver_attach(), the bus' match() callback is called without the device lock held, thus accessing the driver_override field without a lock, which can cause a UAF.
Fix this by using the driver-core driver_override infrastructure taking care of proper locking internally.
Note that calling match() from __driver_attach() without the device lock held is intentional. [1]
Which versions are affected by CVE-2026-80676?
How do I fix CVE-2026-80676?
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-2026-80676 being exploited?
There is no known exploitation of CVE-2026-80676 in the wild and no public exploit code.
Sources
Also known as AZL-98150, BELL-CVE-2026-80676, DEBIAN-CVE-2026-80676, GHSA-pvqm-w959-q2j3, UBUNTU-CVE-2026-80676.