Problem:

Dec  6 09:09:19 kahuna-karlo systemd-modules-load[8745]: Failed to find module 'vboxdrv'
Dec  6 09:09:19 kahuna-karlo systemd-modules-load[8745]: Failed to find module 'vboxnetflt'
Dec  6 09:09:19 kahuna-karlo systemd-modules-load[8745]: Failed to find module 'vboxnetadp'

Solution:

yum install kernel-devel gcc dkms akmod-VirtualBox

syslog:

Dec  6 09:10:31 kahuna-karlo systemd[1]: Starting Load Kernel Modules...
Dec  6 09:10:31 kahuna-karlo kernel: [ 1877.376766] vboxdrv: module verification failed: signature and/or required key missing - tainting kernel
Dec  6 09:10:31 kahuna-karlo kernel: [ 1877.376786] Disabling lock debugging due to kernel taint
Dec  6 09:10:31 kahuna-karlo kernel: [ 1877.384224] vboxdrv: fAsync=0 offMin=0x308 offMax=0x2278
Dec  6 09:10:31 kahuna-karlo systemd-modules-load[12033]: Inserted module 'vboxdrv'
Dec  6 09:10:31 kahuna-karlo kernel: [ 1877.384292] vboxdrv: TSC mode is 'synchronous', kernel timer mode is 'normal'.
Dec  6 09:10:31 kahuna-karlo systemd-modules-load[12033]: Inserted module 'vboxnetflt'
Dec  6 09:10:31 kahuna-karlo systemd-modules-load[12033]: Inserted module 'vboxnetadp'
Dec  6 09:10:31 kahuna-karlo systemd[1]: Started Load Kernel Modules.