CVE-2026-21242— Windows Subsystem for Linux Elevation of Privilege Vulnerability
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I. Basic Information for CVE-2026-21242
Vulnerability Information
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Vulnerability Title
Windows Subsystem for Linux Elevation of Privilege Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
Use after free in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)
Vulnerability Title
Microsoft Windows Subsystem for Linux 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Subsystem for Linux（WSL）是美国微软（Microsoft）公司的一个Windows下的Linux子系统,一个能够运行原生Linux二进制可执行文件（ELF格式）的兼容层。 Microsoft Windows Subsystem for Linux（WSL）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 11 Version 26H1 for ARM64-based Systems,Windows 11 v
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 10 Version 21H2 | 10.0.19044.0 ~ 10.0.19044.6937 | - | |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 ~ 10.0.19045.6937 | - | |
| Microsoft | Windows 11 version 22H3 | 10.0.22631.0 ~ 10.0.22631.6649 | - | |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0 ~ 10.0.22631.6649 | - | |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 ~ 10.0.26100.7840 | - | |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 ~ 10.0.26200.7840 | - | |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 ~ 10.0.28000.1575 | - | |
| Microsoft | Windows 11 Version 26H1 | 10.0.28000.0 ~ 10.0.28000.1575 | - | |
| Microsoft | Windows Server 2022 | 10.0.20348.0 ~ 10.0.20348.4773 | - | |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 ~ 10.0.25398.2149 | - | |
| Microsoft | Windows Server 2025 | 10.0.26100.0 ~ 10.0.26100.32370 | - | |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 ~ 10.0.26100.32370 | - |
II. Public POCs for CVE-2026-21242
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2026-21518 | 8.8 HIGH | GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability |
| CVE-2026-21255 | 8.8 HIGH | Windows Hyper-V Security Feature Bypass Vulnerability |
| CVE-2026-21256 | 8.8 HIGH | GitHub Copilot and Visual Studio Remote Code Execution Vulnerability |
| CVE-2026-21516 | 8.8 HIGH | GitHub Copilot for Jetbrains Remote Code Execution Vulnerability |
| CVE-2026-21513 | 8.8 HIGH | MSHTML Framework Security Feature Bypass Vulnerability |
| CVE-2026-21510 | 8.8 HIGH | Windows Shell Security Feature Bypass Vulnerability |
| CVE-2026-21537 | 8.8 HIGH | Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability |
| CVE-2026-21228 | 8.1 HIGH | Azure Local 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-2026-21229 | 8.0 HIGH | Power BI Remote Code Execution Vulnerability |
| CVE-2026-21240 | 7.8 HIGH | Windows HTTP.sys Elevation of Privilege Vulnerability |
| CVE-2026-21514 | 7.8 HIGH | Microsoft Word Security Feature Bypass Vulnerability |
| CVE-2026-20841 | 7.8 HIGH | Windows Notepad App Remote Code Execution Vulnerability |
| CVE-2026-21533 | 7.8 HIGH | Windows Remote Desktop Services Elevation of Privilege Vulnerability |
| CVE-2026-21236 | 7.8 HIGH | Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability |
| CVE-2026-21246 | 7.8 HIGH | Windows Graphics Component Elevation of Privilege Vulnerability |
| CVE-2026-21259 | 7.8 HIGH | Microsoft Excel Elevation of Privilege Vulnerability |
| CVE-2026-21519 | 7.8 HIGH | Desktop Window Manager Elevation of Privilege Vulnerability |
Showing top 20 of 54 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Windows 10 Version 21H2
- CVE-2026-32155
Desktop Window Manager Elevation of Privilege Vulnerability - CVE-2026-26172
Windows Push Notifications Elevation of Privilege Vulnerabil - CVE-2026-32218
Windows Kernel Information Disclosure Vulnerability - CVE-2026-32181
Connected User Experiences and Telemetry Service Denial of S - CVE-2026-27931
Windows GDI Information Disclosure Vulnerability
Same vendor: Microsoft
- CVE-2026-42826
Azure DevOps Information Disclosure Vulnerability - CVE-2026-35428
Azure Cloud Shell Spoofing Vulnerability - CVE-2026-35435
Azure AI Foundry Elevation of Privilege Vulnerability - CVE-2026-34327
Microsoft Partner Center Spoofing Vulnerability - CVE-2026-33844
Azure Managed Instance for Apache Cassandra Remote Code Exec
V. Comments for CVE-2026-21242
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