Exposure of Sensitive System Information to an Unauthorized Control Sphere in Microsoft Windows and Windows Server - CVE-2026-108409

Vulnerability identifier: #VU164710

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-108409

CWE-ID: CWE-497

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to disclose sensitive information from kernel memory.

The vulnerability exists due to exposure of sensitive system information to an unauthorized control sphere in Windows Overlay Filter when kernel memory is exposed to a user-mode process. A local user can read kernel-space memory from a user-mode process to disclose sensitive system information.

Microsoft Windows
Windows Server

Install security update from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7846, 10 22H2 10.0.19045.7846, 10 1607 10.0.14393.9688, 10 1809 10.0.17763.9487, 11 23H2 10.0.22631.7711, 11 24H2 10.0.26100.9911, 11 24H2 10.0.26100.9974, 11 25H2 10.0.26200.9911, 11 25H2 10.0.26200.9974, 11 26H1 10.0.28000.3501
Windows Server - addressed in versions 2016 10.0.14393.9688, 2019 10.0.17763.9487, 2022 10.0.20348.5870, 2025 10.0.26100.33730, 2025 10.0.26100.33822

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-108409
• https://support.microsoft.com/help/5131291

• Multiple vulnerabilities in Microsoft Windows