Credit is to "Nils Sommer of bytegeist, working with Google Project Zero".

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The attached PoC triggers a wild write on Win 7 32-bit with Special Pool enabled on win32k.sys.
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This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without a broadly available patch, then the bug report will automatically
become visible to the public.

 

special_pool475.txt 6.9 KB View Download

bug475.cpp 757 bytes Download