Multiple Local Privilege Escalation Vulnerabilities in Microsoft Windows

Four local privilege escalation vulnerabilities have been identified in Microsoft Windows, all stemming from improper object management within the win32kfull driver. These vulnerabilities, identified as ZDI-26-618, ZDI-26-619, ZDI-26-620, and ZDI-26-621, allow local attackers to escalate privileges and execute arbitrary code in the context of SYSTEM. An attacker must first execute low-privileged code to exploit these vulnerabilities. Microsoft has issued updates to correct these issues. The vulnerabilities were reported to the vendor on May 11, 2026, and the advisories were publicly released on September 8, 2026. The affected systems are various installations of Microsoft Windows. The vulnerabilities have not been reported as actively exploited in the wild.

Key Points: • Four critical local privilege escalation vulnerabilities identified in Microsoft Windows. • Exploitation requires low-privileged code execution on the target system. • Microsoft has released updates to mitigate these vulnerabilities.