MSRC-CVE-2026-102208 — Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability

Summary

Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.

Security updates
6.2.9200.26434 — https://support.microsoft.com/help/5126835
6.3.9600.23470 — https://support.microsoft.com/help/5126836
10.0.14393.9612 — https://support.microsoft.com/help/5126868
10.0.17763.9376 — https://support.microsoft.com/help/5126651
10.0.19044.7807 — https://support.microsoft.com/help/5126657
10.0.20348.5761 — https://support.microsoft.com/help/5126655
10.0.22631.7652 — https://support.microsoft.com/help/5126653

Vulnerabilities 1

High 7.0

CVE-2026-102208

Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability

Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.

Microsoft Windows Server 2019 Windows Server 2019 (Server Core installation) Windows 10 Version 1809 Windows

Oct 13, 2026

Revision history

2026-11-04 #3
Updated an acknowledgement. This is an informational change only.
2026-10-23 #2
Acknowledgement Updated
2026-10-13 #1
Information published.

References

CVE-2026-102208 Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102208
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss