If we run the current version of BenchmarkDotNet on .NET Core, we will get something like this in summary:

  [Host] : .NET Core 4.6.25211.01, 64bit RyuJIT

.NET Core 4.6.25211.01 is the actual value of System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription.
However, it's very confusing because the correct version of .NET Core runtime should be like 1.0.5 or 1.1.2.