Oct 2026: Windows Win32k Elevation of Privilege Vulnerability
CVE-2026-70271 Published on October 13, 2026

Windows Win32k Elevation of Privilege Vulnerability
Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.

Vendor Advisory NVD

Weakness Type

What is a Dangling pointer Vulnerability?

Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

CVE-2026-70271 has been classified to as a Dangling pointer vulnerability or weakness.

Products Associated with CVE-2026-70271

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Microsoft Windows 10

Microsoft Windows Server 2019

Microsoft Windows Server 2022

Microsoft Windows Server 2025

Microsoft Windows 11 25h2

Microsoft Windows 11 23h2

Microsoft Windows 11 24h2

Microsoft Windows 11 26h1

Microsoft Windows Server 2016

Microsoft Windows Server 2012

Microsoft Windows Server 2012 R2

Microsoft Windows 11 Version 26h2 Arm64 Based Systems

Microsoft Office

Affected Versions

Microsoft Office for Android:

Version 16.0.1 and below 16.0.20430.20000 is affected.

Microsoft Windows 10 Version 1607:

Version 10.0.14393.0 and below 10.0.14393.9612 is affected.

Microsoft Windows 10 Version 1809:

Version 10.0.17763.0 and below 10.0.17763.9376 is affected.

Microsoft Windows 10 Version 21H2:

Version 10.0.19044.0 and below 10.0.19044.7807 is affected.

Microsoft Windows 10 Version 22H2:

Version 10.0.19045.0 and below 10.0.19045.7807 is affected.

Microsoft Windows 11 version 23H2:

Version 10.0.22631.0 and below 10.0.22631.7652 is affected.

Microsoft Windows 11 Version 23H2:

Version 10.0.22631.0 and below 10.0.22631.7652 is affected.

Microsoft Windows 11 Version 24H2:

Version 10.0.26100.0 and below 10.0.26100.9711 is affected.

Microsoft Windows 11 Version 25H2:

Version 10.0.26200.0 and below 10.0.26200.9711 is affected.

Microsoft Windows 11 version 26H1:

Version 10.0.28000.0 and below 10.0.28000.3231 is affected.

Microsoft Windows 11 Version 26H2:

Version 10.0.26300.0 and below 10.0.26300.9711 is affected.

Microsoft Windows Server 2012:

Version 6.2.9200.0 and below 6.2.9200.26434 is affected.

Microsoft Windows Server 2012 (Server Core installation):

Version 6.2.9200.0 and below 6.2.9200.26434 is affected.

Microsoft Windows Server 2012 R2:

Version 6.3.9600.0 and below 6.3.9600.23470 is affected.

Microsoft Windows Server 2012 R2 (Server Core installation):

Version 6.3.9600.0 and below 6.3.9600.23470 is affected.

Microsoft Windows Server 2016:

Version 10.0.14393.0 and below 10.0.14393.9612 is affected.

Microsoft Windows Server 2016 (Server Core installation):

Version 10.0.14393.0 and below 10.0.14393.9612 is affected.

Microsoft Windows Server 2019:

Version 10.0.17763.0 and below 10.0.17763.9376 is affected.

Microsoft Windows Server 2019 (Server Core installation):

Version 10.0.17763.0 and below 10.0.17763.9376 is affected.

Microsoft Windows Server 2022:

Version 10.0.20348.0 and below 10.0.20348.5761 is affected.

Microsoft Windows Server 2025:

Version 10.0.26100.0 and below 10.0.26100.33650 is affected.

Microsoft Windows Server 2025 (Server Core installation):

Version 10.0.26100.0 and below 10.0.26100.33650 is affected.

Oct 2026: Windows Win32k Elevation of Privilege VulnerabilityCVE-2026-70271 Published on October 13, 2026

Weakness Type

What is a Dangling pointer Vulnerability?

Products Associated with CVE-2026-70271

Affected Versions

Oct 2026: Windows Win32k Elevation of Privilege Vulnerability
CVE-2026-70271 Published on October 13, 2026