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intel-microcode was installed (by default?). It does not contain the fix. I wasn't aware of this package. It should be the one this bug is against.
That git repository above installs /lib/firmware/intel-ucode/06-47-01.initramfs, which fixed it for me.

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https://bugs.launchpad.net/bugs/1509764

Title:
  Machine Check Exception with Broadwell CPU

Status in intel-microcode package in Ubuntu:
  New

Bug description:
  My system freezes and reboots 30 seconds later. This happens at random times between shortly after boot or up to three ours after boot. My CPU is a Core i5 5675C. Happens with Ubuntu 15.04 and 15.10. I think it is the same problem discussed here https://bugzilla.kernel.org/show_bug.cgi?id=103351
  They have a microcode update as a fix there.
  All Broadwell CPUs seem to be affected. It does not happen with Fedora 22.
  There are two workarounds that help for some people:
  1. boot with "processor.max_cstate=0 intel_idle.max_cstate=0 idle=poll"
  2. Disable speedstep in the bios
  Both don't work for me.

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