CVE-2026-85369

Undergoing Analysis Undergoing Analysis - In Progress

Out-of-bounds Read in Windows Hyper-V

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Windows Hyper-V allows an authorized attacker to elevate privileges 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-2026-85369

EUVD

EUVD-2026-99494

Affected Vendors & Products

Vendor	Product	Version / Range
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 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-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This is an out-of-bounds read vulnerability in Windows Hyper-V. An authorized attacker with local access can exploit it to elevate their privileges on the system.

Impact Analysis

An attacker could gain higher-level permissions on your system, allowing them to perform unauthorized actions like installing malicious software or accessing sensitive data.

Compliance Impact

This vulnerability allows local privilege escalation in Windows Hyper-V, which could enable unauthorized access to sensitive data or systems. This may violate compliance requirements under GDPR (data protection) and HIPAA (health data security) by exposing protected information or failing to maintain system integrity.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Hyper-V out-of-bounds read vulnerability. Monitor Microsoft's security advisories for patches and install them promptly.

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