CVE-2010-4398: Microsoft Windows Kernel Stack-Based Buffer Overflow Vulnerability

High severity, CVSS 7.8. Actively exploited: in CISA KEV since 2022-03-28. EPSS: 8.7% chance of exploitation in the next 30 days.

Stack-based buffer overflow in the RtlQueryRegistryValues function in win32k.sys in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7 allows local users to gain privileges, and bypass the User Account Control (UAC) feature, via a crafted REG_BINARY value for a SystemDefaultEUDCFont registry key, aka "Driver Improper Interaction with Windows Kernel Vulnerability."

Affected products

• Microsoft Windows 7: affected versions not specified
• Microsoft Windows Server 2003: affected versions not specified
• Microsoft Windows Server 2008: affected versions not specified; version r2 only
• Microsoft Windows Vista: affected versions not specified
• Microsoft Windows XP: affected versions not specified

Published 2010-12-06. Last modified 2026-06-16.