CVE-2021-31166: HTTP Protocol Stack Remote Code Execution Vulnerability

This is a proof of concept for CVE-2021-31166 ("HTTP Protocol Stack Remote Code Execution Vulnerability"), a use-after-free dereference in http.sys patched by Microsoft in May 2021. According to this tweet the vulnerability has been found by @_mxms and @fzzyhd1.

Here is the bugcheck:

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*                        Bugcheck Analysis                                    *
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KERNEL_SECURITY_CHECK_FAILURE (139)
A kernel component has corrupted a critical data structure.  The corruption
could potentially allow a malicious user to gain control of this machine.
Arguments:
Arg1: 0000000000000003, A LIST_ENTRY has been corrupted (i.e. double remove).
Arg2: fffffe001fe8ee40, Address of the trap frame for the exception that caused the BugCheck
Arg3: fffffe001fe8ed98, Address of the exception record for the exception that caused the BugCheck
Arg4: 0000000000000000, Reserved