Improper access control in Linux kernel - CVE-2026-64042
Published: July 20, 2026
Vulnerability identifier: #VU138603
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-64042
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to access unreserved PCI BAR resources.
The vulnerability exists due to improper access control in the vfio PCI DMABUF export path when creating a DMABUF for a BAR region. A local user can request export of a BAR region whose PCI resources were not reserved to access unreserved PCI BAR resources.
How to mitigate CVE-2026-64042
Install security update from vendor's repository.