This vulnerability (CVE-2026-26156) is a heap-based buffer overflow in the Windows Hyper-V component of Windows 10 Version 1607 (build 10.0.14393.0). It enables an unauthorized attacker to execute code locally, potentially leading to full system compromise. The CVSS 3.1 score is 7.8 (high severity) with attack vector local, low attack complexity, no privileges required, user interaction required, and impacts to confidentiality, integrity, and availability all rated high. Microsoft has released an official fix for this vulnerability.

Successful exploitation allows an unauthorized local attacker to execute arbitrary code, resulting in full compromise of the affected system's confidentiality, integrity, and availability. This could lead to system control or disruption of services.

An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26156 to remediate this vulnerability.