Upgrade kernel on Sparky Linux 2023.07 up to 6.4.4-sparky8 via Synaptic Manager . Then atcivate Debian 12 repo per https://linuxiac.com/virtualbox-7-0-10-released/ and proceed as follows . . .

Source: LXer – Install VirtualBox 7.0.10 on Sparky Linux 2023.07 ( kernel 6.4.4 ) as KVM Guest