SB20260507259 - Improper access control in Linux kernel hyperv

Description

This security bulletin contains information about 1 vulnerability.

1) Improper access control (CVE-ID: CVE-2026-43096)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to improper access control in mshv_handle_gpa_intercept() when handling guest memory access intercepts on movable memory regions. A local user can trigger writes to non-writable regions or executes to non-executable regions to cause a denial of service.

The issue can cause the vCPU to enter an infinite fault loop and consume host resources.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/02226839079ccc558820a3b25c4c46812927b4ba
• https://git.kernel.org/stable/c/16cbec24897624051b324aa3a85859c38ca65fde