Source: https://code.google.com/p/google-security-research/issues/detail?id=505

The attached testcase triggers a use-after-free condition in win32k. The attached debugger output was triggered on Windows 7 with Special Pool enabled on win32k.sys.
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Proof of Concept:
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/38796.zip