Improper access control in Linux kernel - CVE-2026-90315
Published: September 18, 2026
Vulnerability identifier: #VU151166
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-90315
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-90315
Install security update from vendor's repository.