CVE-2025-62215: Microsoft Windows Race Condition Vulnerability

CVE-2025-62215 is a race condition vulnerability in the Microsoft Windows Kernel. It allows a local attacker who already has low-level privileges on a system to escalate those privileges. Successful exploitation can result in the attacker obtaining SYSTEM-level access, which grants full control over the affected Windows host.

This matters because local privilege escalation flaws are commonly chained after an initial foothold. Once an attacker reaches SYSTEM, they can disable security tools, move laterally, install persistence, or access sensitive data. Confirm all product and version details against the official Microsoft advisory before acting.

How it works

The vulnerability is classified as CWE-362, a concurrent execution using shared resource with improper synchronization (race condition). In the Windows Kernel, a race condition arises when two or more threads or processes access a shared resource without correct locking or ordering guarantees. An attacker with low privileges can attempt to win the race by carefully timing operations so that the kernel performs a privileged action on behalf of the attacker or leaves a resource in an insecure state.

Because the flaw resides in kernel code, a successful race can elevate the attacker’s process token or otherwise grant SYSTEM rights. Exact timing windows, affected kernel objects, and exploit techniques are not detailed in the public summary; defenders should treat any local low-privilege process as a potential starting point and verify technical specifics only against the vendor advisory.

Am I affected? How to find it in your systems

The vulnerability affects Microsoft Windows systems that include the vulnerable kernel component. Windows is typically present on endpoints, servers, virtual machines, and cloud-hosted instances running Microsoft operating systems. Inventory every Windows host in your environment—physical, virtual, and cloud—using your existing asset management, configuration management database, or endpoint detection tools.

• Query installed Windows build and kernel version information via system inventory scripts, Microsoft Endpoint Configuration Manager, Intune, or equivalent tools.
• Cross-reference the collected versions against the list of affected builds published in the Microsoft security advisory for CVE-2025-62215; do not rely on version numbers that are not stated in that advisory.
• Look for signs of local privilege escalation attempts in security telemetry: unexpected process token elevation, creation of SYSTEM-level processes by non-administrative users, anomalous kernel-mode activity, or alerts from endpoint detection and response (EDR) products that flag race-condition or privilege-escalation patterns.
• Review Windows Security event logs and Sysmon or equivalent logs for unusual access to kernel objects or privilege-use events originating from low-privilege accounts.

Public detail on exact vulnerable configurations is limited; always confirm against the vendor advisory.

How to remediate

Apply the security update provided by Microsoft for this vulnerability as soon as possible. Follow the installation guidance and reboot requirements listed in the official Microsoft advisory. After patching, verify that the update has been successfully applied across all Windows systems by checking update history or using compliance reporting tools.

• Prioritize internet-facing or high-value systems first, then proceed through the rest of the estate according to risk.
• Where applicable, follow CISA’s Binding Operational Directive 22-01 guidance for cloud services that may host Windows instances.
• After the patch is installed, re-baseline system configurations and re-enable any temporary hardening measures that are no longer required.
• Test the update in a representative non-production environment if your change-control process requires it, then deploy broadly.

If mitigations are unavailable for a particular system, CISA guidance states that organizations should discontinue use of the product until a fix can be applied.

If you can't patch immediately

Until the vendor update can be deployed, reduce the attack surface and limit the impact of a successful local privilege escalation.

• Enforce strict least-privilege policies so that users and services run with the minimum rights necessary; remove local administrator rights wherever possible.
• Segment networks so that a compromised low-privilege host cannot easily reach domain controllers or other high-value assets.
• Enable and tune EDR or host-based intrusion prevention rules that detect privilege-escalation behaviors and race-condition indicators.
• Consider application allow-listing or similar controls that prevent untrusted binaries from executing, thereby reducing the chance an attacker can run the code needed to win the race.
• Increase monitoring of process creation, token manipulation, and kernel-related events; alert on any elevation to SYSTEM from unexpected parent processes.
• If a specific Windows feature that exercises the vulnerable code path can be safely disabled, do so after confirming the impact with Microsoft documentation.

These steps are compensating controls only; they do not eliminate the vulnerability. Schedule the official patch as the primary remediation.

If your data may have been exposed

Actively exploited local privilege-escalation vulnerabilities frequently lead to full system compromise and subsequent data exposure. Although ransomware use of this specific CVE is not documented, any successful elevation to SYSTEM can enable data theft or further malicious activity. Review access logs, EDR timelines, and authentication records for signs of unauthorized SYSTEM activity. Organizations and individuals can also run a free exposure scan of their email addresses against known breach data sets to determine whether credentials or personal information have already appeared in public breach collections.