What is CVE-2026-41088?

CVE-2026-41088 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Which CVE IDs does CVE-2026-41088 cover?

CVE-2026-41088 covers the following CVE IDs: CVE-2026-41088. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-41088?

CVE-2026-41088 has a CVSS v3 base score of 7.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-41088?

CVE-2026-41088 affects 19 products, including: Windows 10 Version 21H2 for 32-bit Systems; Windows 10 Version 21H2 for ARM64-based Systems; Windows 10 Version 21H2 for x64-based Systems; Windows 10 Version 22H2 for 32-bit Systems; Windows 10 Version 22H2 for ARM64-based Systems; and others — see the full list on the advisory page.

CVE-2026-41088HighCVSS 7.8

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 22, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-41088 →

📋 Description

Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

🎯 Affected products19

Windows 10 Version 21H2 for 32-bit Systems
Windows 10 Version 21H2 for ARM64-based Systems
Windows 10 Version 21H2 for x64-based Systems
Windows 10 Version 22H2 for 32-bit Systems
Windows 10 Version 22H2 for ARM64-based Systems
Windows 10 Version 22H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Windows 11 Version 26H1 for ARM64-based Systems
Windows 11 version 26H1 for x64-based Systems
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2022, 23H2 Edition (Server Core installation)
Windows Server 2025
Windows Server 2025 (Server Core installation)

✅ Remediation

KB5087545 (Security Update) — fixed build 10.0.20348.5139 KB5087424 (Security Hotpatch Update) — fixed build 10.0.20348.5074 KB5087544 (Security Update) — fixed build 10.0.19044.7291 KB5094127 (Security Update) — fixed build 10.0.19045.7417 KB5087539 (Security Update) — fixed build 10.0.26100.32860 KB5087423 (Security Hotpatch Update) — fixed build 10.0.26100.32772 KB5089549 (Security Update) — fixed build 10.0.26200.8457 KB5089466 (Security Hotpatch Update) — fixed build 10.0.26200.8390 KB5087420 (Security Update) — fixed build 10.0.22631.7079 KB5093998 (Security Update) — fixed build 10.0.22631.7219 KB5087541 (Security Update) — fixed build 10.0.25398.2330 KB5089549 (Security Update) — fixed build 10.0.26100.8457 KB5089466 (Security Hotpatch Update) — fixed build 10.0.26100.8390 KB5089548 (Security Update) — fixed build 10.0.28000.2113

🔗 CVE IDs covered (1)

📋 Description

🎯 Affected products19

✅ Remediation

🔗 References (25)