Windows Win32K GRFX Integer Overflow RCE
2026-06-09
Local code execution in the Windows Win32K GRFX (graphics) subsystem allows an unauthorized attacker with the ability to run code locally to escalate privileges through an integer overflow. The flaw was reported by Microsoft (MSRC) and carries a CVSS 7.8, but requires user interaction (UI:R) and local access (AV:L), and no public exploit identified at time of analysis.
Local code execution in Microsoft Windows Win32K GRFX (graphics) subsystem allows an attacker with low-privilege local access to run arbitrary code by triggering an integer overflow, after coaxing a user into interacting with a crafted graphics object. No public exploit identified at time of analysis, and the issue is not listed in CISA KEV, though Win32K bugs historically attract rapid exploit development for privilege escalation in post-compromise chains.