For an AMD, 40C at idle is great.
What's not great is that temperatures continue to rise until the CPU overheats.
That definitely indicates a serious cooling problem. Might be that the CPU fan is not functioning correctly or is not controlled properly - check your firmware settings (aka BIOS).
Might be that the heatsink is not seated properly, as zyisrad said.
Might be that you need to replace your thermal paste. That is likely the case if you ever unscrewd the heatsink and didn't care to clean up and renew the paste. But can also occur naturally. Generally the advice is to replace the thermal paste once every 3 years or so.
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