Microsoft Windows - Race Condition DestroySMWP 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-2015-6101;OSVDB-130044;MS15-115 
tags: 
aliases:  
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Source: https://code.google.com/p/google-security-research/issues/detail?id=509

The attached testcase crashes Window 7 32-bit with Special Pool enabled on win32k.sys due to a use-after-free condition. The bug appears to be a race condition between two threads and multiple runs on the PoC might be required to trigger the bug. This is more reliable on systems with multiple cores.
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Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/38795.zip