For what its worth:
I have the same issue with Ubuntu 22.04.4 LTS (Desktop).
Working kernel (i.e. VM in Virtualbox 6.1 boots): Linux 5.15.0-1061-gke Broken kernel (i.e. VM no longer boots): Linux 5.15.0-1062-gke
Workaround: Installed Virtualbox 7 from the Oracle PPA repository and migrated VM with some teething problems.
For what its worth:
I have the same issue with Ubuntu 22.04.4 LTS (Desktop).
Working kernel (i.e. VM in Virtualbox 6.1 boots): Linux 5.15.0-1061-gke
Broken kernel (i.e. VM no longer boots): Linux 5.15.0-1062-gke
Workaround: Installed Virtualbox 7 from the Oracle PPA repository and migrated VM with some teething problems.