SB20260626144 - Improper access control in Linux kernel include asm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper access control (CVE-ID: CVE-2026-53200)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to bypass execute permission restrictions.

The vulnerability exists due to improper access control in KVM arm64 nested virtualization translation handling when processing XN bits on systems without FEAT_XNX. A local user can manipulate a nested translation state to bypass execute permission restrictions.

The issue occurs because XN[0] is handled incorrectly when FEAT_XNX is not supported, which can result in execute permissions being granted unconditionally.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/49b32ddb87a3a109afecea89e55d70f73956b8bc
• https://git.kernel.org/stable/c/b95976c2ea446044553a5f469c0bae13553d75ab