Advisory Details

December 9th, 2025

Microsoft Windows win32kfull Type Confusion Local Privilege Escalation Vulnerability

ZDI-25-1046
ZDI-CAN-27832

CVE ID CVE-2025-62458
CVSS SCORE 8.8, AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS

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 specific flaw exists within the win32kfull driver. The issue results from the lack of proper validation of user-supplied data, which can result in a type confusion condition. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62458
DISCLOSURE TIMELINE
  • 2025-08-07 - Vulnerability reported to vendor
  • 2025-12-09 - Coordinated public release of advisory
  • 2025-12-09 - Advisory Updated
CREDIT Marcin Wiazowski
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