CVE-2026-102214 – Windows Hyper-V Remote Code Execution Vulnerability

A critical remote code execution vulnerability has been identified in Microsoft Windows Hyper-V that could allow an attacker with low-level privileges inside a virtual machine to execute arbitrary code on the underlying host operating system. The vulnerability occurs because Hyper-V fails to properly validate input received from an authenticated guest operating system user. By running a specially crafted application inside a virtual machine, an attacker could cross the security boundary between the guest and host environments. Successful exploitation could compromise the confidentiality, integrity, and availability of the host system, potentially affecting other virtual machines and business applications running on the same infrastructure.

CVSS SCORE: 8.8

SEVERITY: Critical

Threat

This vulnerability presents a serious security threat to organizations using Microsoft Hyper-V virtualization technology.

An attacker with low-level access to a Hyper-V guest operating system could exploit this weakness to execute malicious code on the underlying host server.

The most concerning aspect is the potential to escape the security boundaries of a virtual machine and compromise the host operating system.

Because the attack requires low privileges and no user interaction, an attacker who already has access to a vulnerable guest environment could attempt exploitation without requiring additional actions from another user.

Successful exploitation could potentially lead to:

• Unauthorized execution of malicious code on Hyper-V host servers.
• Exposure or modification of sensitive information.
• Disruption of virtual machines and business-critical applications.
• Compromise of the security boundaries separating virtual machines from their hosts.
• Widespread operational disruption if critical virtualization infrastructure is affected.

Exploits

Microsoft reports that this vulnerability has not been publicly disclosed or actively exploited.

The exploitation assessment is Exploitation Less Likely, indicating that successful exploitation is considered less likely.

The exploit code maturity is classified as Unproven.

No confirmed publicly available proof-of-concept (PoC) exploit code or zero-day exploitation is identified.

However, the vulnerability has low attack complexity, requires only low privileges, and does not require user interaction.

These characteristics make the vulnerability particularly concerning in environments where attackers may have already gained access to a virtual machine.

Technical Summary

CVE-2026-102214 is a critical remote code execution vulnerability affecting Microsoft Windows Hyper-V.

The vulnerability is associated with CWE-416: Use After Free, a memory management weakness that occurs when software attempts to access memory after it has already been released.

In this case, Windows Hyper-V does not properly validate input received from an authenticated user operating inside a guest virtual machine.

An attacker could exploit this weakness by creating and executing a specially crafted application within the guest operating system.

When the vulnerable Hyper-V component processes the malicious input, it could allow the attacker to execute arbitrary code within the host operating system.

A particularly important characteristic of this vulnerability is its changed scope (S:C).

This means successful exploitation could allow an attacker to cross the security boundary separating the guest virtual machine from the Hyper-V host.

Normally, virtual machines operate within isolated environments designed to prevent activity inside one virtual machine from affecting the underlying host.

This vulnerability could undermine that isolation.

The CVSS metrics indicate:

• Attack Vector: Local
• Attack Complexity: Low
• Privileges Required: Low
• User Interaction: None
• Scope: Changed
• Confidentiality Impact: High
• Integrity Impact: High
• Availability Impact: High

Successful exploitation could allow an attacker to execute unauthorized code on the host, potentially compromising sensitive information, modifying system resources, or disrupting services.

Microsoft addresses the vulnerability through a security update that corrects how Hyper-V validates input received from guest operating systems.

Exploitability

The vulnerability affects multiple Microsoft products, including:

• Windows Server: 2016, 2019, 2022, and 2025, including Server Core installations.
• Windows 10: Versions 1607, 1809, 21H2, and 22H2.
• Windows 11: Versions 23H2, 24H2, 25H2, and 26H1.
• Microsoft Visual Studio: 2026 version 18.10.

Affected architectures include 32-bit, x64, and ARM64 systems, depending on the Windows version.

An attacker with low privileges inside a Hyper-V guest could execute a specially crafted application to exploit the vulnerability and potentially run arbitrary code on the host.

No user interaction is required.

Business Impact

This vulnerability poses a significant risk to organizations relying on Hyper-V to host critical applications, business services, and virtualized infrastructure.

A compromised virtual machine should not become a gateway to the entire virtualization host, but this vulnerability could make that possible.

The ability to cross the boundary between a guest operating system and its host creates serious concerns for organizations operating multiple workloads on shared virtualization infrastructure.

Potential business consequences include:

• Host Server Compromise: Attackers could execute unauthorized code on Hyper-V hosts, threatening the security of critical infrastructure.
• Sensitive Data Exposure: Successful exploitation could expose confidential business information and other sensitive resources accessible through the compromised host.
• Service Disruption: Attackers could interfere with host operations, potentially affecting multiple virtual machines and business applications.
• Operational Downtime: Disruption of virtualization infrastructure could interrupt business services and reduce employee productivity.
• Security Boundary Failure: Compromising the isolation between guest and host environments could expose additional workloads to security risks.
• Financial and Reputational Damage: Significant service interruptions or security incidents could result in recovery costs, operational losses, and reduced customer confidence.

Organizations running business-critical workloads on Hyper-V should treat this vulnerability as an important infrastructure security concern.

Workaround

Microsoft has not identified any official mitigations or workarounds for this vulnerability.

Installing the applicable Microsoft security update is the recommended remediation.

If immediate patching is not possible, organizations may consider temporary risk-reduction measures such as restricting access to Hyper-V guest environments, limiting unnecessary privileges, and monitoring suspicious activity.

These precautions do not eliminate the vulnerability.

The security update requires a system restart.

Urgency

Critical – High Priority Deployment

CVE-2026-102214 should be prioritized for deployment because it could allow attackers to escape a Hyper-V guest environment and execute arbitrary code on the underlying host.

Although Microsoft currently assesses exploitation as less likely and reports no known active exploitation, several characteristics increase the potential security impact.

The vulnerability has a CVSS score of 8.8, low attack complexity, and requires only low privileges without user interaction.

Most importantly, successful exploitation could compromise the security boundary protecting the Hyper-V host from potentially malicious activity inside virtual machines.

Organizations should prioritize patching Hyper-V hosts supporting critical workloads, especially those hosting multiple virtual machines or sensitive business applications.

Recommended Action: Deploy the applicable Microsoft security updates through the organization’s critical patch management process, coordinate the required restarts, and verify successful installation.

The longer a vulnerable Hyper-V host remains unpatched, the longer a compromised guest could remain a potential path into critical infrastructure.