CVE-2026-70294

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Read in Windows Win32 Kernel Subsystem

Publication date: 2026-10-13

Last updated on: 2026-10-21

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Windows Win32 Kernel Subsystem allows an authorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-21

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-70294

EUVD

EUVD-2026-99884

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)

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.
CWE-20	The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Attack-Flow Graph

Executive Summary

This is an out-of-bounds read vulnerability in the Windows Win32 Kernel Subsystem. It allows an authorized attacker with local access to read memory outside the intended boundary, potentially exposing sensitive information.

Detection Guidance

This vulnerability is an out-of-bounds read in the Windows Win32 Kernel Subsystem. Detection typically requires analyzing system logs or using Microsoft's security tools. Check for unusual kernel-level access patterns or crashes in Windows systems. Use Microsoft's Update Guide to verify if patches are applied.

Impact Analysis

An attacker could exploit this to access sensitive data on your system, such as passwords or encryption keys, if they already have local access. This could lead to further compromise of your system or data.

Compliance Impact

This vulnerability allows local information disclosure due to an out-of-bounds read in the Windows Win32 Kernel Subsystem. Such unauthorized information exposure could potentially violate GDPR's data protection requirements or HIPAA's safeguards for protected health information if exploited.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the out-of-bounds read vulnerability in the Windows Win32 Kernel Subsystem.

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