CVE-2026-70108

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Heap-based Buffer Overflow in Windows Win32 Kernel Subsystem

Publication date: 2026-10-13

Last updated on: 2026-10-22

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.

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Meta Information

Published

2026-10-13

Last Modified

2026-10-22

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-70108

EUVD

EUVD-2026-99165

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-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This is a heap-based buffer overflow vulnerability in the Windows Win32 Kernel Subsystem. It allows an authorized attacker with local access to exploit memory corruption and elevate their privileges on the system.

Detection Guidance

This vulnerability is a local privilege escalation issue in the Windows Win32 Kernel Subsystem. Detection typically requires monitoring for unusual privilege escalation attempts or kernel-level anomalies. Use Windows Event Viewer to check for Event ID 4688 (new process creation) and Event ID 4672 (special privileges assigned). Run 'wevtutil qe Security /q:*[System[(EventID=4688)]]' in Command Prompt to filter relevant events.

Impact Analysis

An attacker could gain higher-level permissions on your system, allowing them to install programs, view or delete data, or create new accounts with full user rights. This could lead to complete system compromise if exploited.

Compliance Impact

This vulnerability allows local privilege escalation via a heap-based buffer overflow in the Windows Win32 Kernel Subsystem. Such attacks could enable unauthorized access to sensitive data or system functions, potentially violating data protection requirements under GDPR and HIPAA by compromising confidentiality and integrity of personal or health information.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft Update to patch the heap-based buffer overflow in the Win32 Kernel Subsystem.

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