This vulnerability involves an integer overflow or wraparound condition within the Windows Desktop Window Manager (DWM) Core Library in Windows 11 Version 24H2. Exploitation requires local access with some privileges and can result in elevation of privileges, potentially allowing an attacker to gain higher-level system permissions. The CVSS v3.1 base score is 7.8, indicating high severity. Microsoft has issued an official fix for this vulnerability, as documented in their security update guide.

Successful exploitation of this vulnerability could allow an authorized local attacker to elevate their privileges, gaining higher-level access on the affected Windows 11 system. This could lead to full system compromise depending on the privileges escalated to. There are currently no reports of active exploitation in the wild.

An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 11 Version 24H2 as soon as possible to remediate this vulnerability. Refer to the Microsoft security update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42896 for detailed patch information and deployment instructions.