New kernel 4.12.5 packages in main testing. ‘kernel-release-desktop-4.12.5-2’ installed on 2 computers for 2 days here and working. So far have noticed no regression.
Post edit: I should have specified that this is working on hardware on 2 computers.
Note: To those with virtualbox 5.1.26 Colin says he built this kernel version with the correct driver for virtualbox 5.1.26.