Local privilege escalation via kernel TOCTOU race
Published Sep 8, 2026 · Updated Sep 9, 2026
A TOCTOU race in the Microsoft Windows Kernel allows local users with low privileges to elevate privileges on affected Windows systems. The kernel checks an unspecified resource and later uses it after the resource state can change and invalidate the completed check. Low-privileged local access and winning the race are required; successful exploitation grants SYSTEM privileges.
Summary
What happened
A TOCTOU race in the Microsoft Windows Kernel allows local users with low privileges to elevate privileges on affected Windows systems. The kernel checks an unspecified resource and later uses it after the resource state can change and invalidate the completed check. Low-privileged local access and winning the race are required; successful exploitation grants SYSTEM privileges.
The record
- CVE
- CVE-2026-69466
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-367, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.9245
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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