SB20260720190 - Improper access control in Linux kernel vfio pci driver
Published: July 20, 2026
Security Bulletin ID
SB20260720190
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper access control (CVE-ID: CVE-2026-64042)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 4.8 [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]
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.
Remediation
Install update from vendor's website.