Windows Server 2016 EUVD-2026-22400

This vulnerability presents moderate real-world risk justified by multiple signals. The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N) indicates low attack complexity and no user interaction required, but restricts the threat model to authenticated local attackers-eliminating remote exploitation risk. The high confidentiality impact (C:H) reflects kernel memory disclosure, often a precursor to privilege escalation or advanced attacks; however, the absence of integrity or availability impact (I:L/A:N) limits direct damage. EUVD data confirms the vendor has published specific patched build versions for all affected branches, enabling rapid remediation. The exploitation difficulty depends on kernel internals knowledge and local access acquisition, but once local access is achieved, exploitation appears straightforward given the unchecked read condition. This fits the profile of a local information disclosure used in multi-stage attacks rather than a standalone critical threat.

A malicious local application or script running under standard user privileges (PR:L) on a Windows system triggers a buffer over-read in the kernel memory interface, reading beyond allocated boundaries to extract sensitive kernel data such as pointers, encryption keys, or other protected information. This disclosed information is then used to defeat ASLR, identify kernel gadgets, or prepare for a privilege escalation attack in a subsequent stage. The attack requires prior local code execution capability but does not require administrator rights or user interaction.