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

Severity: high (CVSS 7.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-13 · updated 2026-10-31
Weakness: CWE-416

Description

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

Affected products

Microsoft Windows 10 1607: before 10.0.14393.9612 — fixed in 10.0.14393.9612
Microsoft Windows 10: before 10.0.17763.9376 — fixed in 10.0.17763.9376
Microsoft Windows 10: before 10.0.19044.7807 — fixed in 10.0.19044.7807
Microsoft Windows 10: before 10.0.19045.7807 — fixed in 10.0.19045.7807
Microsoft Windows 11: before 10.0.22631.7652 — fixed in 10.0.22631.7652
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: before 10.0.14393.9612 — fixed in 10.0.14393.9612
Microsoft Windows Server 2019: before 10.0.17763.9376 — fixed in 10.0.17763.9376
Microsoft Windows Server 2022: before 10.0.20348.5761 — fixed in 10.0.20348.5761
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.9612 — fixed in 10.0.14393.9612
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.9376 — fixed in 10.0.17763.9376
Microsoft Windows 10: from 10.0.19044.0 before 10.0.19044.7807 — fixed in 10.0.19044.7807
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.7807 — fixed in 10.0.19045.7807
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.7652 — fixed in 10.0.22631.7652
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.26434 — fixed in 6.2.9200.26434
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.23470 — fixed in 6.3.9600.23470
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.9612 — fixed in 10.0.14393.9612
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.9376 — fixed in 10.0.17763.9376
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.5761 — fixed in 10.0.20348.5761

How to fix

Upgrade to a fixed version: Microsoft Windows 10 1607 10.0.14393.9612; Microsoft Windows 10 10.0.17763.9376; Microsoft Windows 10 10.0.19044.7807; Microsoft Windows 10 10.0.19045.7807; Microsoft Windows 11 10.0.22631.7652; Microsoft Windows Server 2016 10.0.14393.9612; Microsoft Windows Server 2019 10.0.17763.9376; Microsoft Windows Server 2022 10.0.20348.5761; Microsoft Windows 10 1607 10.0.14393.9612; Microsoft Windows 10 10.0.17763.9376; Microsoft Windows 10 10.0.19044.7807; Microsoft Windows 10 10.0.19045.7807. Check the vendor advisory for mitigations.

In the news

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

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102208

Get alerted when CVE-2026-102208 or the next vulnerability affects your stack