Executive brief
A security vulnerability exists in the Windows Win32K graphics component, which manages how applications interact with displays and input devices. An attacker who already has basic access to a computer could exploit this flaw to gain full administrative control over the system. This type of privilege escalation allows an unauthorized user to bypass security restrictions, access sensitive data, or install malicious software.
Technical details
A race condition (CWE-362) exists in the Windows Win32K - GRFX component due to improper synchronization when accessing shared resources. The vulnerability requires the attacker to have local access with low-level privileges (PR:L). Because it is a race condition, the attack complexity is considered high (AC:H), as it requires precise timing to exploit the concurrent execution flaw. Successful exploitation allows an attacker to gain SYSTEM-level privileges, leading to a total loss of confidentiality, integrity, and availability. Microsoft has released security updates to address this issue.
Affected products
- Microsoft Windows Not specified
Timeline
- 2026-05-12: disclosed: Initial disclosure by Microsoft and NVD.
- 2026-05-12: advisory: Microsoft Security Response Center published the update guide.