Does CVE-2026-102214 Expose Hyper-V Hosts to Local Code Execution?

Microsoft has identified a high-severity vulnerability in Windows Hyper-V that permits local code execution. The National Vulnerability Database assigns CVE-2026-102214 a CVSS score of 8.8, reflecting the significant risk to environments running this virtualization platform.

The flaw stems from a use-after-free error within the Hyper-V component. According to the official advisory, an authorized attacker can exploit this weakness to execute code locally. The source material does not specify the privilege level of the executed code beyond the attacker's authorized status.

Context and Background

This issue relates to memory management failures where a program continues to use memory after it has been freed. Such errors often lead to crashes or, in this case, code execution. As SecOps Monitor reported on 2026-10-14, Microsoft NPS also suffered from an integer underflow flaw, highlighting a pattern of complex memory issues in recent updates.

Who Is Affected

Several specific versions of Windows are exposed to this vulnerability. Affected systems include Windows 10 Version 1607 before build 10.0.14393.9612 and Version 1809 before build 10.0.17763.9376. Windows 10 Version 21H2 and 22H2 are affected if they run builds prior to 10.0.19044.7807.

Windows 11 version 23H2 is also at risk if the system is running a build earlier than 10.0.22631.7652. Organizations must verify their current build numbers against these thresholds to determine exposure. Systems running the specified builds or later are not listed as affected.

Next steps

Security teams should immediately audit their Hyper-V host environments. Identify any servers or workstations running the affected Windows versions listed above. Compare the installed build numbers with the safe versions mentioned in the advisory. If a system falls below the required build number, it is considered vulnerable.

Monitor vendor channels for the release of cumulative updates or security patches that address CVE-2026-102214. The source material lists specific builds that are not affected, implying that updates exist for those versions. Prioritize deploying these updates to all exposed Hyper-V hosts to mitigate the risk.

Signals worth monitoring

Teams usually detect exploitation attempts through unusual process creation events on the host. Check for unexpected executions originating from Hyper-V services or privileged accounts. Look for memory access violations or crashes in system logs that coincide with user activity. First containment moves often involve isolating the affected host from the network to prevent lateral movement. Verify whether any unauthorized processes have persisted after a reboot.

What to do and how to stay safe: Microsoft

• Audit all Windows hosts running Hyper-V to identify versions prior to the specified safe builds.
• Restrict local administrative access to Hyper-V hosts to minimize the pool of potential attackers.
• Monitor system logs for unexpected process executions or memory errors linked to Hyper-V services.
• Apply updates immediately once the vendor releases a fix for CVE-2026-102214.

Step-by-step guide: Emergency Patching Checklist for Critical System Fixes

General security guidance from the SecOps Monitor newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

What is the CVSS score for CVE-2026-102214?

The National Vulnerability Database rates this vulnerability at 8.8, which is classified as high severity.

Which Windows versions are affected by this flaw?

Windows 10 versions 1607, 1809, 21H2, and 22H2, as well as Windows 11 version 23H2, are affected if they run builds below the specified thresholds.

Can this vulnerability be exploited remotely?

No, the advisory states that an authorized attacker can execute code locally, implying prior access to the system is required.