Use-after-free in Microsoft Windows and Windows Server - CVE-2025-26681

Vulnerability identifier: #VU107261

CSH Severity: Low

CVSS v4: 5.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-26681

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: Public exploit is available

The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Win32k. A local user can win a race condition and gain elevated privileges on the system.

Microsoft Windows
Windows Server

Install update from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.5737, 10 22H2 10.0.19045.5737, 10 1607 10.0.14393.7970, 11 22H2 10.0.22621.5191, 11 23H2 10.0.22631.5191, 11 24H2 10.0.26100.3775
Windows Server - addressed in versions 2012 R2 6.3.9600.22523, 2022 23H2 10.0.25398.1551, 2022 10.0.20348.3454, 2025 10.0.26100.3775

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26681

• Multiple vulnerabilities in Microsoft Win32k