Credit is to "Nils Sommer of bytegeist, working with Google Project Zero".
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This PoC triggers a crash on Windows 7 32-bit with Special Pool enabled on win32k.sys. The kernel crashes due to a use-after-free condition with bitmaps in the clipboard.
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Note that multiple PoC executions and simulated system activity may be required to trigger this issue.
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.
