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CVE-2026-20859— Windows Kernel-Mode Driver Elevation of Privilege Vulnerability

Quick assessment

Affected
Microsoft Windows 11 Version 24H2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows Kernel Mode Drivers是美国微软（Microsoft）公司的Windows内核模式驱动。 Microsoft Windows Kernel Mode Drivers存在资源管理错误漏洞。攻击者利用该漏洞可以提升权限。以下产品和版本受到影响：Windows Server 2025 (Server Core installation),Windows 11 Version 25H2 for ARM64-based Systems,Windows 11 Ver

CVSS 7.8 · High EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 4

VendorProduct Version RangeStatus
Microsoft Windows 11 Version 24H2 10.0.26100.0< 10.0.26100.7623 affected
Microsoft Windows 11 Version 25H2 10.0.26200.0< 10.0.26200.7623 affected
Microsoft Windows Server 2025 10.0.26100.0< 10.0.26100.32230 affected
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0< 10.0.26100.32230 affected
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I. Basic Information for CVE-2026-20859

Vulnerability Information
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Vulnerability Title
Windows Kernel-Mode Driver Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows Kernel Mode Drivers 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Kernel Mode Drivers是美国微软（Microsoft）公司的Windows内核模式驱动。 Microsoft Windows Kernel Mode Drivers存在资源管理错误漏洞。攻击者利用该漏洞可以提升权限。以下产品和版本受到影响：Windows Server 2025 (Server Core installation),Windows 11 Version 25H2 for ARM64-based Systems,Windows 11 Ver
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Windows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.7623 -
Microsoft Windows 11 Version 25H2 10.0.26200.0 ~ 10.0.26200.7623 -
Microsoft Windows Server 2025 10.0.26100.0 ~ 10.0.26100.32230 -
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.32230 -

II. Public POCs for CVE-2026-20859

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III. Intelligence Information for CVE-2026-20859

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Same Patch Batch · Microsoft · 2026-01-13 · 112 CVEs total

CVE-2026-20963 9.8 CRITICAL Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2026-20947 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-20868 8.8 HIGH Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2026-20952 8.4 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2026-20944 8.4 HIGH Microsoft Word Remote Code Execution Vulnerability
CVE-2026-20953 8.4 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2026-20856 8.1 HIGH Windows Server Update Service (WSUS) Remote Code Execution Vulnerability
CVE-2026-20931 8.0 HIGH Windows Telephony Service Elevation of Privilege Vulnerability
CVE-2026-20951 7.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-20832 7.8 HIGH Windows Remote Procedure Call Interface Definition Language (IDL) Elevation of Privilege V
CVE-2026-20920 7.8 HIGH Win32k Elevation of Privilege Vulnerability
CVE-2026-20843 7.8 HIGH Windows Routing and Remote Access Service (RRAS) Elevation of Privilege Vulnerability
CVE-2026-20938 7.8 HIGH Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerability
CVE-2026-20837 7.8 HIGH Windows Media Remote Code Execution Vulnerability
CVE-2026-21224 7.8 HIGH Azure Connected Machine Agent Elevation of Privilege Vulnerability
CVE-2026-20840 7.8 HIGH Windows NTFS Remote Code Execution Vulnerability
CVE-2026-20956 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-20940 7.8 HIGH Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
CVE-2026-20865 7.8 HIGH Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20946 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability

Showing top 20 of 112 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Windows 11 Version 24H2
Same vendor: Microsoft
Same weakness: CWE-416

V. Comments for CVE-2026-20859

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