ZDI-CAN-31479: ZDI-26-541: (Pwn2Own) Microsoft Windows win32kfull Use-After-Free Local Privilege Escalation Vulnerability

Published Aug 11, 2026

Updated

This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.8. The following CVEs are assigned: CVE-2026-65775.

Affected Software

1 affected component

Microsoft Windows

Event History

Aug 11, 2026

Advisory Published

via ZDI·05:00 AM

Data Sourced

via ZDI·05:00 AM

Description

Frequently Asked Questions

What is the severity of ZDI-CAN-31479?

The severity of ZDI-CAN-31479 is rated at 8.8 according to the CVSS.

How do I fix ZDI-CAN-31479?

To fix ZDI-CAN-31479, ensure that you have the latest security updates installed for Microsoft Windows.

Who is affected by ZDI-CAN-31479?

ZDI-CAN-31479 affects installations of Microsoft Windows that have not been patched against this vulnerability.

What type of vulnerability is ZDI-CAN-31479?

ZDI-CAN-31479 is a local privilege escalation vulnerability due to a use-after-free error in win32kfull.

How can an attacker exploit ZDI-CAN-31479?

An attacker can exploit ZDI-CAN-31479 by executing low-privileged code on a vulnerable Microsoft Windows system.