SB20260918353 - Improper access control in Linux kernel pci driver
Published: September 18, 2026
Security Bulletin ID
SB20260918353
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-2026-90315)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to bypass kernel lockdown PCI access restrictions.
The vulnerability exists due to improper access control in the legacy PCI sysfs I/O and memory handlers when accessing legacy I/O and memory spaces while the kernel is locked down. A local privileged user can write arbitrary I/O ports and map legacy I/O and memory spaces to bypass kernel lockdown PCI access restrictions.
Remediation
Install update from vendor's website.