Use-after-free in Linux kernel - CVE-2026-64475
Published: July 27, 2026
Vulnerability identifier: #VU139472
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64475
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the VGA arbiter callback handling in vfio_pci_core_register_device() when registration of a vfio PCI device fails after VGA arbiter client initialization. A local user can trigger device registration failure and leave a stale callback referencing freed device data to cause a denial of service.
The issue occurs on the error path and depends on a stale VGA arbiter registration remaining after the vfio device state has been freed.
Affected software
Linux kernel
How to mitigate CVE-2026-64475
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/0f2a35a0c7ea7da347b814750eaa78adf3582381
- https://git.kernel.org/stable/c/278a5659c391fe5afe5f9ce1bad1fd24e90144f1
- https://git.kernel.org/stable/c/42d758a09d2c46c42357ecde9a5492f015bde2e5
- https://git.kernel.org/stable/c/52adb2dff7ce3d8430e2bdc5988b618a430def85
- https://git.kernel.org/stable/c/8d65decde9afd2bd78bcfffdc0df73b82a0b5509
- https://git.kernel.org/stable/c/9e0a3f642e607848669235f5069f35640abbfc88
- https://git.kernel.org/stable/c/daedde7f024ecf88bc8e832ed40cf2c795f0796a
- https://git.kernel.org/stable/c/ef4c38d30b3744e89eb5048218904bb629ea8d47