CVE-2026-83774

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Exposure of Sensitive System Information in Windows Win32 Kernel Subsystem

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Exposure of sensitive system information to an unauthorized control sphere in Windows Win32 Kernel Subsystem allows an authorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

Probability:
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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-2026-83774

EUVD

EUVD-2026-99992

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-497	The product does not properly prevent sensitive system-level information from being accessed by unauthorized actors who do not have the same level of access to the underlying system as the product does.

Attack-Flow Graph

Executive Summary

This vulnerability involves the exposure of sensitive system information to an unauthorized control sphere in the Windows Win32 Kernel Subsystem. An authorized attacker could exploit this to disclose information locally on affected systems.

Detection Guidance

This vulnerability involves local information disclosure in the Windows Win32 Kernel Subsystem. Detection typically requires monitoring for unusual system information exposure or kernel-level activity. Use Windows Event Viewer to check for suspicious events in Security, System, or Application logs. Commands like 'wevtutil qe System /q:"*[System[(Level=2 or Level=3)]]" /c:50' can help review system events. Ensure Windows Defender or third-party AV tools are updated to detect related anomalies.

Impact Analysis

An attacker with local access could potentially access sensitive system information, leading to unauthorized data disclosure. This may include system configurations or other confidential details.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft Update immediately. Enable automatic updates if not already configured. Restrict local user permissions to minimize potential exploitation. Monitor Microsoft's advisory page for additional guidance or patches. Consider isolating critical systems until updates are applied.

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