SB20260816105 - Improper Initialization in Linux kernel arm64 kvm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Initialization (CVE-ID: CVE-2026-72278)

CWE-ID: CWE-665 - Improper Initialization

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 handling of vncr translation state in the arm64 kvm nested virtualization vncr handling logic when processing vncr aborts after a read-only translation is cached and a subsequent write abort occurs. A local user can trigger vncr abort conditions to cause a denial of service.

The issue occurs in nested virtualization on arm64 systems involving vncr page access.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0a5dd8cf4d58ea28da132c2097cd1c525302ac48
• https://git.kernel.org/stable/c/bb645aa0a4caeaf7f9cd32e9a948594d434c1a8f
• https://git.kernel.org/stable/c/ea7a76d7d614b5f82b4d0785f9af3550e860a71a