CVE-2026-64042 vfio/pci: Check BAR resources before exporting a DMABUF
Attackers can access unreserved PCI BAR resources via DMABUF exports due to missing checks, potentially reading or modifying memory.
- 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-2026-64042?
CVE-2026-64042 is a high-severity missing authorization vulnerability in Linux kernel, published on 19 Jul 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: Check BAR resources before exporting a DMABUF
A DMABUF exports access to BAR resources and, although they are requested at startup time, we need to ensure they really were reserved before exporting. Otherwise, it's possible to access unreserved resources through the export.
Add a check to the DMABUF-creation path.
Weakness: CWE-862
Which versions are affected by CVE-2026-64042?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64042?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-64042 being exploited?
There is no known exploitation of CVE-2026-64042 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2026-64042, GHSA-h9jg-4972-qw48, UBUNTU-CVE-2026-64042.