After running vzup2date tool the package vzkernel-devel is not updated, although corresponding vzkernel package is updated.
The updated version of vzkernel-devel is downloaded, but not installed due to a known issue with ID PCLIN-26479 which is to be fixed in one of Parallels Virtuozzo Containers updates.
Manually install the required vzkernel-devel package for corresponding kernel.
Make sure all updates are installed and downloaded:
~# vzupdate -s -m batch install --self-update
Locate the required RPM package for vzkernel-devel:
~# find /vz/vzup2date/ -name "vzkernel-devel*"
Install the package:
~# rpm -i /PATH/TO/vzkernel-devel-KERNEL.rpm