CVE-2026-31468 vfio/pci: Fix double free in dma-buf feature
A double free vulnerability in the Linux kernel's vfio/pci driver allows attackers to cause denial of service or potentially execute code via file descriptor exhaustion.
- 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-2026-31468?
CVE-2026-31468 is a high-severity memory corruption vulnerability in Linux kernel, published on 22 Apr 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:
vfio/pci: Fix double free in dma-buf feature
The error path through vfio_pci_core_feature_dma_buf() ignores its own advice to only use dma_buf_put() after dma_buf_export(), instead falling through the entire unwind chain. In the unlikely event that we encounter file descriptor exhaustion, this can result in an unbalanced refcount on the vfio device and double free of allocated objects.
Avoid this by moving the "put" directly into the error path and return the errno rather than entering the unwind chain.
Weakness: CWE-415
Which versions are affected by CVE-2026-31468?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31468?
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-2026-31468 being exploited?
There is no known exploitation of CVE-2026-31468 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2026-31468, GHSA-489p-vfcx-x55r, UBUNTU-CVE-2026-31468.