Local information disclosure via optimized-away security checks
Published Jul 8, 2025 · Updated Feb 13, 2026
Information disclosure in the Windows Kernel in Windows 11 24H2 and Windows Server 2025 allows local users to read kernel data. Processor optimization removes or modifies security-critical kernel code, but Microsoft has not identified the affected routine or disclosed how crafted local input reaches it. Low-privileged local access is required, and successful exploitation exposes information without reported integrity or availability impact.
Summary
What happened
Information disclosure in the Windows Kernel in Windows 11 24H2 and Windows Server 2025 allows local users to read kernel data. Processor optimization removes or modifies security-critical kernel code, but Microsoft has not identified the affected routine or disclosed how crafted local input reaches it. Low-privileged local access is required, and successful exploitation exposes information without reported integrity or availability impact.
The record
- CVE
- CVE-2025-26636
- Published
- Jul 8, 2025
- Updated
- Feb 13, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-1037
- 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=10.0.26100.0 <10.0.26100.4652
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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