This vulnerability (CVE-2026-42910) involves an out-of-bounds write condition in the Windows Hotpatch Monitoring Service component of Microsoft Windows 11 Version 24H2 (build 10.0.26100.0). An attacker with local authorized access can exploit this flaw to elevate their privileges on the affected system. The issue is classified under CWE-787 (Out-of-bounds Write). Microsoft has published an official fix to address this vulnerability.

Successful exploitation allows a local authorized attacker to gain elevated privileges, potentially leading to full system compromise. The vulnerability affects confidentiality, integrity, and availability with high impact as indicated by the CVSS vector (C:H/I:H/A:H). There are no known exploits in the wild at the time of this report.

An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 11 Version 24H2 (build 10.0.26100.0) as soon as possible to remediate this vulnerability. Refer to the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42910 for detailed patch information and update instructions.