CVE-2025-62215 is a race condition vulnerability in Microsoft Windows. CISA added it to the Known Exploited Vulnerabilities catalogue on 12 November 2025, which means attackers have used it in real attacks. Microsoft Windows Kernel contains a race condition vulnerability that allows a local attacker with low-level privileges to escalate privileges.
What the vulnerability is
A race condition in Windows means two or more code paths compete over the same state or resource, and the outcome depends on timing rather than intended logic. In the kernel, that can create a brief but powerful window where a local attacker can win access checks or manipulate privileged operations.
Because the flaw is in Microsoft Windows Kernel, the security impact is not limited to one application. Kernel bugs can affect core operating-system trust boundaries, so a successful exploit may move an attacker from low-level local access to a much higher privilege level on the same host.
Why race conditions are dangerous in a kernel
Race bugs are hard to reason about because the vulnerable condition may only appear under specific scheduling, load, or concurrency patterns. That makes them especially dangerous in kernel code, where small timing differences can change memory ownership, object state, or privilege decisions.
For defenders, the key point is that the weakness is structural rather than cosmetic. A race condition can survive normal functional testing because the vulnerable interleaving is rare, but when it is reachable it can produce reliable privilege escalation. This is why kernel race issues are often treated as high-value local escalation paths even when initial access is required.
When CISA places a CVE in the Known Exploited Vulnerabilities catalogue, it is a signal to treat exposure as active, not theoretical. For version and patch details, readers should use the vendor advisory and the CVE Program record alongside the NIST National Vulnerability Database entry.
How organisations assess exposure and reduce risk
Exposure begins with knowing which Windows systems are in scope, where they sit, and who can log on locally or obtain a foothold there. Asset inventory matters because local privilege escalation is only relevant if the vulnerable kernel is present on a reachable endpoint, server, or admin workstation.
Internet exposure usually does not create the flaw by itself, but it can widen the blast radius once an attacker gets a foothold through phishing, remote access, or another initial access vector. For that reason, patch prioritisation should focus on externally reachable systems, high-value administrative hosts, and endpoints where local execution is easier to obtain.
Because this is a known exploited issue, remediation should be driven by the vendor fix and by validation of deployed assets rather than by generic vulnerability lists alone. The most useful operational reference is the organisation's patch workflow, supported by a vulnerability management process that can rank KEV-listed issues for rapid handling.
What remediation and post-patch review should cover
When patching is available, organisations should apply the vendor update as the primary corrective action and then verify that the vulnerable build is no longer present. If patching is delayed, compensating controls should reduce local execution opportunities and narrow who can run code on the affected systems.
After exploitation, the security question is not only whether the host is patched, but whether the attacker used the privilege window to plant persistence, disable controls, or dump sensitive material. Post-patch review should therefore look for unusual local admin creation, suspicious service changes, tampering with security tools, and evidence of lateral movement from the affected machine.
If a local attacker successfully escalated privileges, the identity impact can extend beyond the host itself. Any cached credentials, active sessions, tokens, or service-account material exposed during the compromise should be reviewed and rotated where compromise is plausible.
Risk and Threat Considerations
This vulnerability matters because a local race condition in the Windows kernel can turn a limited foothold into administrative control on the same system. That changes the attacker from a constrained user to a privileged operator, which can unlock persistence, defence evasion, credential access, and lateral movement.
Failure mechanism: The exploit depends on winning a timing window in kernel execution, where a privileged action or state transition is observed in the wrong order and the attacker can exploit the inconsistent state before it is corrected.
Impact: Successful exploitation can lead to local privilege escalation, security control bypass, and deeper compromise of the host, including follow-on actions that are far harder to contain after administrative access is obtained.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack and risk surface, while CIS Controls v8, NIST SP 800-53 Rev 5 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | Windows KEV-listed exploitation is governed by rapid vulnerability prioritization and remediation. |
| Recommendation — Prioritise and remediate KEV-listed Windows hosts through continuous vulnerability management. | ||
| NIST SP 800-53 Rev 5 | SI-2 — Flaw Remediation | Kernel race conditions require patching, verification and remediation tracking as a control objective. |
| AC-6 — Least Privilege | Local privilege escalation is directly constrained by limiting what low-level users can do. | |
| Recommendation — Apply SI-2 to identify, patch and verify remediation for vulnerable Windows systems. Enforce AC-6 to reduce the permissions available to attackers before exploitation succeeds. | ||
| MITRE ATT&CK | T1068 — Exploitation for Privilege Escalation | The CVE's core effect is attacker-driven escalation from low privileges to higher privilege. |
| Recommendation — Map detections and hunting logic to T1068 to spot privilege escalation activity on Windows hosts. | ||
| NIST CSF 2.0 | PR.AA-05 — Least Privilege | The issue is a privilege-escalation path, so access minimization materially reduces impact. |
| Recommendation — Use PR.AA-05 to restrict local permissions and reduce the blast radius of compromise. | ||
Practitioner Guidance
Why practitioners should care: A kernel LPE changes the incident response posture from endpoint containment to host trust restoration, because the attacker may have been able to tamper with telemetry, credentials, or security tooling before detection.
What to watch for: Review affected systems for suspicious privilege changes, unexpected local admin activity, new persistence mechanisms, and signs that the host was used as a stepping stone to other internal assets.
Practitioner takeaway: Treat a KEV-listed Windows kernel race condition as a time-sensitive exposure, not a routine patch item, and verify both remediation and compromise artefacts after deployment.
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Reviewed and updated by the NHIMG editorial team on October 17, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org