Executive brief
Windows Win32K is a core kernel-mode driver that manages graphics, user interface, and window display functionality on Windows systems. A use-after-free vulnerability allows an authorized local user to execute code with elevated privileges, potentially compromising the entire system and gaining unrestricted access to sensitive data and administrative functions.
Technical details
A use-after-free vulnerability exists in the Windows Win32K kernel-mode driver, where freed memory is accessed after deallocation, leading to memory corruption. An authorized local attacker can trigger this flaw to gain privilege escalation from a user-mode context to kernel-mode execution. The vulnerability requires local code execution capability but does not require network access. Successful exploitation allows an attacker to execute arbitrary code in the kernel context, bypassing standard Windows security boundaries. Microsoft has released security updates to address this issue.
Affected products
- Microsoft Windows
Timeline
- 2026-09-08: disclosed