SB2026081697 - Improper access control in Linux kernel arm64 kvm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper access control (CVE-ID: CVE-2026-72279)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper access control in the KVM arm64 nested virtualization VNCR mapping logic when handling writes to an L1 VNCR backed by a read-only PFN. A local user can attempt to write to a read-only endpoint to cause a denial of service.

The issue affects the handling of read-only memslots and promotes the resulting fault to a synchronous external abort.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2684e02bac41c5220f6c1ab2bdcc957b71812977
• https://git.kernel.org/stable/c/5c50db5bcbb9073cb2fd97be51b962de92f429e9
• https://git.kernel.org/stable/c/d35defbdfcb15296ebe28968ad7452c1a8c11cea