Local privilege escalation via QoS scheduler race
Published Jul 8, 2025 · Updated Feb 13, 2026
A TOCTOU race in the Microsoft Windows QoS scheduler allows local authenticated users to elevate privileges on affected builds. Microsoft identifies a time-of-check/time-of-use race in the scheduler but has not disclosed the raced resource or mismatched operations. A low-privileged local account and successful race timing are required; exploitation grants elevated control over confidentiality, integrity, and availability.
Summary
What happened
A TOCTOU race in the Microsoft Windows QoS scheduler allows local authenticated users to elevate privileges on affected builds. Microsoft identifies a time-of-check/time-of-use race in the scheduler but has not disclosed the raced resource or mismatched operations. A low-privileged local account and successful race timing are required; exploitation grants elevated control over confidentiality, integrity, and availability.
The record
- CVE
- CVE-2025-49730
- Published
- Jul 8, 2025
- Updated
- Feb 13, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-122, CWE-367, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 8, 2025CVE publishedPublication date reported by the CVE source.
- Feb 13, 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=10.0.10240.0 <10.0.10240.21073
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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