CVE-2026-69348: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 11 Version 24H2

This vulnerability involves a heap-based buffer overflow in the Win32K subsystem of Microsoft Windows 11 Version 24H2. An authorized attacker with local access can exploit this flaw to elevate their privileges on the affected system. The CVSS v3.1 base score is 7.8, indicating high severity with impacts on confidentiality, integrity, and availability. The affected versions include Windows 11 builds from 10.0.26100.0 up to but not including 10.0.26100.9445, 10.0.26200.0 up to but not including 10.0.26200.9445, 10.0.28000.0 up to but not including 10.0.28000.2954, and 10.0.26100.0 up to but not including 10.0.26100.33438. Microsoft has released an official fix for this vulnerability.

Successful exploitation allows a local authorized attacker to elevate privileges, potentially gaining higher-level access to the system. The vulnerability affects confidentiality, integrity, and availability of the affected Windows 11 systems. There are no known exploits in the wild at this time.

An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft for Windows 11 Version 24H2 as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69348. Applying the patch will remediate the vulnerability.