Use-after-free in Linux kernel - CVE-2026-64473
Published: July 27, 2026
Vulnerability identifier: #VU139469
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-2026-64473
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 VFIO device debugfs entries when handling device unregister operations while userspace references remain open. A local user can keep references to the debugfs view during device teardown to cause a denial of service.
The issue affects diagnostic debugfs entries that may remain visible with stale inode private data during unregister.
Affected software
Linux kernel
How to mitigate CVE-2026-64473
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3