You can avoid rmmod, and return teh kvm behaviour to its per-6.12.x
state by adding this .conf file to /etc/modprobe.d/

===== VBox-NoKVM.conf =====
# This is so that VirtualBox can start.
# See:
#   https://www.virtualbox.org/wiki/Changelog 
#
# VirtualBox 7.1.4 (released October 15 2024)
#   Linux Guest Additions: Introduce initial support for kernel 6.12 (NOTE:
#   In kernel 6.12, KVM initializes virtualization on module loading by
#   default. This prevents VirtualBox VMs from starting. In order to avoid
#   this, either add "kvm.enable_virt_at_load=0" parameter into kernel
#   command line or unload corresponding kvm_XXX module) 
#
options kvm enable_virt_at_load=0
===== end file =====

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https://bugs.launchpad.net/bugs/2107725

Title:
  Virtualbox will not start on Plucky with kvm modules loaded

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