CVE-2026-83755

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Use of Uninitialized Resource in Windows Win32K Allows Local Information Disclosure

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Use of uninitialized resource in Windows Win32K allows an authorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-83755

EUVD

EUVD-2026-99980

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	10 Version 1607 10.0.14393.0
Microsoft	Windows	10 Version 1809 10.0.17763.0
Microsoft	Windows	10 Version 21H2 10.0.19044.0
Microsoft	Windows	10 Version 22H2 10.0.19045.0
Microsoft	Windows	11 version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 24H2 10.0.26100.0
Microsoft	Windows	11 Version 25H2 10.0.26200.0
Microsoft	Windows	11 version 26H1 10.0.28000.0
Microsoft	Windows	11 Version 26H2 10.0.26300.0
Microsoft	Windows	Server 2012 6.2.9200.0
Microsoft	Windows	Server 2012 (Server Core installation) 6.2.9200.0
Microsoft	Windows	Server 2012 R2 6.3.9600.0
Microsoft	Windows	Server 2012 R2 (Server Core installation) 6.3.9600.0
Microsoft	Windows	Server 2016 10.0.14393.0
Microsoft	Windows	Server 2016 (Server Core installation) 10.0.14393.0
Microsoft	Windows	Server 2019 10.0.17763.0
Microsoft	Windows	Server 2019 (Server Core installation) 10.0.17763.0
Microsoft	Windows	Server 2022 10.0.20348.0
Microsoft	Windows	Server 2025 10.0.26100.0
Microsoft	Windows	Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-908	The product uses or accesses a resource that has not been initialized.

Attack-Flow Graph

Executive Summary

This vulnerability involves the use of an uninitialized resource in Windows Win32K, which allows an authorized attacker to disclose information locally. It does not require user interaction and has a low attack complexity.

Detection Guidance

This vulnerability involves uninitialized resource usage in Windows Win32K, which may lead to local information disclosure. Detection typically requires analyzing system memory or kernel behavior for uninitialized variable usage. No direct commands are provided in the available resources, but monitoring tools like Windows Event Viewer, kernel debuggers, or Microsoft Defender for Endpoint may help identify suspicious activity.

Impact Analysis

An attacker could exploit this to access sensitive information stored on the system. Since it requires local access, physical or remote access to the machine is necessary. The impact is limited to information disclosure.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, potentially violating GDPR and HIPAA compliance requirements. Organizations must address it to maintain data protection standards.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the uninitialized resource issue in Win32K. Monitor Microsoft's update guide for the specific patch.

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