Source: https://code.google.com/p/google-security-research/issues/detail?id=433

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The attached PoC demonstrates a UAF condition with printer device contexts. The PoC will trigger on Win 7 32-bit with Special Pool enabled.
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Proof of Concept:
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/38279.zip