Double free vulnerability in win32k.sys in the kernel-mode drivers in Microsoft Windows 8.1, Windows Server 2012 R2, and Windows RT 8.1 allows local users to gain privileges via a crafted application, aka "Windows Cursor Object Double Free Vulnerability."
https://exchange.xforce.ibmcloud.com/vulnerabilities/100432
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-010