I had done a search on the above error message.
I can find a similar report in Bugzilla. Can you check if you are seeing the same:
There also the issue happened after a Linux upgrade. Please share your OS details as well [including the VM you are using].
Yes, I admit it looks like a bug in the OS. Here are the details on the environment:
OS: 3.16.7-32-desktop #1 SMP PREEMPT Wed Jan 20 14:05:33 UTC 2016 (d4df98a) x86_64 GNU/Linux
Virtualbox: 5.0.10_SUSE r104061 with the extension pack 5.0.10r104061
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OK! It works again!
The solution was: To use another software-repository for the most up-to-date virtualbox!
After the update I installed virtualbox 5.0.10 from the official opensuse-repositories. The virtual machines started perfectly, but USB didn't work.
Then I added the repository "http://download.virtualbox.org/virtualbox/rpm/opensuse/13.2" from the virtualbox homepage. From there I got the 5.0.14 and now everything is working again!
May this help anybody who might have the same problem!