Microsoft Windows Kernel - Device Contexts and NtGdiSelectBitmap Use-After-Free (MS15-115)

Author: Nils Sommer
type: dos
platform: windows
port: 
date_added: 2015-11-23 
date_updated: 2015-11-23 
verified: 1 
codes: CVE-2015-6100;OSVDB-130043;MS15-115 
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aliases:  
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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://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/38796.zip