The RyuJIT compiler in Microsoft .NET Framework 4.6 produces incorrect code during an attempt at optimization, which allows remote attackers to execute arbitrary code via a crafted .NET application, aka "RyuJIT Optimization Elevation of Privilege Vulnerability," a different vulnerability than CVE-2015-2480 and CVE-2015-2481.
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-092