Kernel information disclosure via TDX.sys over-read
Published Jul 8, 2025 · Updated Feb 13, 2026
An out-of-bounds read in Microsoft Windows TDX.sys allows local users to disclose information from kernel memory. TDX.sys reads beyond an allocated buffer's boundary and returns adjacent memory that the request was not entitled to access. Exploitation requires low-privilege local access; Microsoft reports confidentiality impact only and has not disclosed the triggering request or data exposed.
Summary
What happened
An out-of-bounds read in Microsoft Windows TDX.sys allows local users to disclose information from kernel memory. TDX.sys reads beyond an allocated buffer's boundary and returns adjacent memory that the request was not entitled to access. Exploitation requires low-privilege local access; Microsoft reports confidentiality impact only and has not disclosed the triggering request or data exposed.
The record
- CVE
- CVE-2025-49658
- Published
- Jul 8, 2025
- Updated
- Feb 13, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-125
- 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?
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- 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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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