CVE-2026-21238— Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Quick assessment
Affected
Microsoft Windows 10 Version 1607
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 Ancillary Function Driver for WinSock是美国微软（Microsoft）公司的Winsock的辅助功能驱动程序。 Microsoft Windows Ancillary Function Driver for WinSock存在访问控制错误漏洞。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 11 Version 26H1 for ARM64-based Systems,Windows 11 version 26H
Possible ATT&CK Techniques 1 AI
T1068 · Exploitation for Privilege EscalationAffected Version Matrix 22
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0< 10.0.14393.8868 |
affected |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0< 10.0.17763.8389 |
affected |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0< 10.0.19044.6937 |
affected |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0< 10.0.19045.6937 |
affected |
| Microsoft | Windows 11 version 22H3 | 10.0.22631.0< 10.0.22631.6649 |
affected |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0< 10.0.22631.6649 |
affected |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0< 10.0.26100.7840 |
affected |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0< 10.0.26200.7840 |
affected |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0< 10.0.28000.1575 |
affected |
| Microsoft | Windows 11 Version 26H1 | 10.0.28000.0< 10.0.28000.1575 |
affected |
| Microsoft | Windows Server 2012 | 6.2.9200.0< 6.2.9200.25923 |
affected |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0< 6.2.9200.25923 |
affected |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0< 6.3.9600.23022 |
affected |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0< 6.3.9600.23022 |
affected |
| Microsoft | Windows Server 2016 | 10.0.14393.0< 10.0.14393.8868 |
affected |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0< 10.0.14393.8868 |
affected |
| Microsoft | Windows Server 2019 | 10.0.17763.0< 10.0.17763.8389 |
affected |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0< 10.0.17763.8389 |
affected |
| Microsoft | Windows Server 2022 | 10.0.20348.0< 10.0.20348.4773 |
affected |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0< 10.0.25398.2149 |
affected |
| Microsoft | Windows Server 2025 | 10.0.26100.0< 10.0.26100.32370 |
affected |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0< 10.0.26100.32370 |
affected |
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I. Basic Information for CVE-2026-21238
Vulnerability Information
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Vulnerability Title
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper access control in Windows Ancillary Function Driver for WinSock 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
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows Ancillary Function Driver for WinSock 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Ancillary Function Driver for WinSock是美国微软（Microsoft）公司的Winsock的辅助功能驱动程序。 Microsoft Windows Ancillary Function Driver for WinSock存在访问控制错误漏洞。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 11 Version 26H1 for ARM64-based Systems,Windows 11 version 26H
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
II. Public POCs for CVE-2026-21238
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Same Patch Batch · Microsoft · 2026-02-10 · 54 CVEs total
| CVE-2026-21531 | 9.8 CRITICAL | Azure SDK for Python Remote Code Execution Vulnerability |
| CVE-2026-21537 | 8.8 HIGH | Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability |
| CVE-2026-21510 | 8.8 HIGH | Windows Shell Security Feature Bypass Vulnerability |
| CVE-2026-21255 | 8.8 HIGH | Windows Hyper-V Security Feature Bypass Vulnerability |
| CVE-2026-21518 | 8.8 HIGH | GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability |
| CVE-2026-21513 | 8.8 HIGH | MSHTML Framework Security Feature Bypass Vulnerability |
| CVE-2026-21516 | 8.8 HIGH | GitHub Copilot for Jetbrains Remote Code Execution Vulnerability |
| CVE-2026-21256 | 8.8 HIGH | GitHub Copilot and Visual Studio Remote Code Execution Vulnerability |
| CVE-2026-21228 | 8.1 HIGH | Azure Local Remote Code Execution Vulnerability |
| CVE-2026-21229 | 8.0 HIGH | Power BI Remote Code Execution Vulnerability |
| CVE-2026-21257 | 8.0 HIGH | GitHub Copilot and Visual Studio Elevation of Privilege Vulnerability |
| CVE-2026-21523 | 8.0 HIGH | GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability |
| CVE-2026-21250 | 7.8 HIGH | Windows HTTP.sys Elevation of Privilege Vulnerability |
| CVE-2026-21533 | 7.8 HIGH | Windows Remote Desktop Services Elevation of Privilege Vulnerability |
| CVE-2026-21514 | 7.8 HIGH | Microsoft Word Security Feature Bypass Vulnerability |
| CVE-2026-21232 | 7.8 HIGH | Windows HTTP.sys Elevation of Privilege Vulnerability |
| CVE-2026-21259 | 7.8 HIGH | Microsoft Excel Elevation of Privilege Vulnerability |
| CVE-2026-21239 | 7.8 HIGH | Windows Kernel Elevation of Privilege Vulnerability |
| CVE-2026-21231 | 7.8 HIGH | Windows Kernel Elevation of Privilege Vulnerability |
| CVE-2026-21240 | 7.8 HIGH | Windows HTTP.sys Elevation of Privilege Vulnerability |
Showing top 20 of 54 CVEs. View all on vendor page → →
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V. Comments for CVE-2026-21238
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