CVE-2026-102211 – Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerability

CVE-2026-102211 is a critical elevation of privilege vulnerability affecting Windows Virtualization-Based Security (VBS) Enclave. The vulnerability allows an attacker with low-level access to a vulnerable system to potentially gain SYSTEM privileges by exploiting a use-after-free condition and a race condition. Successful exploitation could give attackers extensive control over the affected device, allowing them to access sensitive information, modify system configurations, and disrupt critical operations. Although exploitation requires precise timing and is considered less likely, the potential impact is significant because an attacker could gain the highest level of privileges on a Windows system.

CVSS SCORE: 7.0

SEVERITY: Critical

Threat

This vulnerability presents a significant security risk because it could allow an attacker with limited privileges to escalate their access to SYSTEM level.

An attacker who successfully exploits this weakness could potentially:

• Gain SYSTEM-level privileges and take control of the affected Windows device.
• Access or modify sensitive business information.
• Install malicious software or interfere with security controls.
• Modify critical system settings and compromise system integrity.
• Disrupt applications and essential business services.

The vulnerability requires local access and low-level privileges, meaning an attacker must already have some level of access to the targeted system.

However, no user interaction is required for exploitation.

Although exploitation is technically challenging because attackers must successfully trigger a race condition, the consequences of a successful attack could be severe.

Exploits

Microsoft classifies this vulnerability as “Exploitation Less Likely.”

The vulnerability has not been publicly disclosed, and there are no reported instances of active exploitation.

The exploit code maturity is classified as “Unproven,” meaning the existence of publicly available, functional exploit code has not been confirmed.

There is also no confirmed evidence of publicly available proof-of-concept (PoC) exploit code or zero-day exploitation.

However, attackers with existing access to vulnerable systems could potentially attempt to exploit this weakness to gain elevated privileges.

The requirement to win a race condition increases exploitation difficulty, but it does not eliminate the security risk.

Technical Summary

CVE-2026-102211 is an elevation of privilege vulnerability in Windows Virtualization-Based Security (VBS) Enclave.

The vulnerability involves two security weaknesses:

1. Use-After-Free (CWE-416)

A use-after-free vulnerability occurs when software attempts to access memory after that memory has already been released.

This can create unsafe memory operations that attackers may potentially manipulate to influence program behavior.

In this case, the memory-handling weakness affects Windows VBS Enclave and could contribute to unauthorized privilege escalation.

2. Race Condition (CWE-362)

The vulnerability also involves improper synchronization when multiple execution operations access shared resources.

A race condition occurs when the outcome of an operation depends on the timing or sequence of competing operations.

An attacker must successfully trigger this timing-related weakness to exploit the vulnerability.

Microsoft identifies the attack complexity as High (AC:H) because successful exploitation requires the attacker to win a race condition.

How the Attack Works:

An attacker with low-level privileges could attempt to exploit the vulnerable VBS Enclave component through specially timed local operations.

If the attacker successfully triggers the use-after-free condition during the race condition, the vulnerability could allow the attacker to elevate privileges.

Successful exploitation could result in the attacker gaining SYSTEM privileges, which provide extensive control over the Windows operating system.

The vulnerability has the following technical characteristics:

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

The vulnerability could compromise all three major security objectives: confidentiality, integrity, and availability.

Exploitability

The vulnerability affects multiple Microsoft Windows operating systems and one listed Microsoft Visual Studio release.

Affected Microsoft Products:

• Windows 10: Versions 1607, 1809, 21H2, and 22H2 (x64).
• Windows 11: Version 23H2 (x64), and versions 24H2, 25H2, and 26H1 (x64 and ARM64).
• Windows Server: 2016, 2019, 2022, and 2025, including Server Core installations.
• Microsoft Visual Studio: 2026 version 18.10.

Exploitation requires local access with low privileges but does not require user interaction.

Attackers must successfully exploit a race condition, making exploitation relatively difficult.

Microsoft currently assesses exploitation as less likely.

Business Impact

This vulnerability could create serious security and operational risks for organizations operating affected Windows systems.

The primary concern is that an attacker with limited access could potentially gain SYSTEM privileges and compromise an entire device.

Once elevated privileges are obtained, attackers could potentially perform unauthorized activities that threaten business operations.

Potential business consequences include:

• Complete System Compromise: Attackers could gain extensive control over compromised endpoints or servers.
• Sensitive Data Exposure: Confidential business information, credentials, and other sensitive records could become accessible.
• Security Control Manipulation: Attackers with elevated privileges could attempt to disable or interfere with endpoint security protections.
• Malware Deployment: Compromised systems could be used to install malicious software or establish persistent unauthorized access.
• Operational Disruption: Unauthorized system modifications could affect application availability and critical business services.
• Compliance and Financial Risks: A successful compromise could result in investigation costs, operational losses, and regulatory concerns.

The risk is particularly important for organizations running affected Windows Server environments because compromised servers may support business-critical applications and services.

A single privilege escalation vulnerability can turn limited system access into a much larger security incident.

Although exploitation is considered less likely, organizations should not underestimate the potential consequences of attackers gaining SYSTEM-level access.

Workaround

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

The recommended remediation is to install the applicable Microsoft security update.

Relevant updates include:

• Windows 10 / Windows Server 2016: KB5126868, where applicable.
• Windows 10 / Windows Server 2019: KB5126651, where applicable.
• Windows 10 21H2 and 22H2: KB5126657.
• Windows 11 23H2: KB5126653.
• Windows 11 24H2 and 25H2: KB5127648.
• Windows 11 26H1: KB5127646.
• Windows Server 2022: KB5126655.
• Windows Server 2025: KB5126646.
• Microsoft Visual Studio 2026 version 18.10: KB5127648.

System administrators should select the appropriate security update for each affected product.

A system restart is required after installing the applicable updates.

No known issues are listed for these updates.

Urgency

This critical vulnerability should be prioritized for patch deployment because successful exploitation could allow attackers to gain SYSTEM privileges on affected Windows devices.

While Microsoft currently considers exploitation less likely and no active exploitation has been reported, the potential impact remains significant.

The vulnerability affects multiple Windows client and server operating systems, increasing its relevance across enterprise environments.

Organizations should prioritize patching systems that handle sensitive information, support critical business operations, or are accessible to users with limited privileges.

Particular attention should be given to affected Windows Server environments, where unauthorized privilege escalation could threaten important business services.

The absence of known exploitation does not eliminate the risk. Delaying security updates leaves a potential path for attackers to turn limited access into full system control.

Deploying the applicable Microsoft security updates promptly will help reduce exposure to this vulnerability and protect critical Windows environments.