Incorrect detection of Virtualbox Guest Additions

[accictavandongen]

Hi,

I've run into a situation where Vagrant seems to incorrectly detect the Virtualbox Guest Additions (GA) version. When I start the VM I get the warning that the GA version does not match the Virtualbox version.

==> default: Checking for guest additions in VM...
    default: The guest additions on this VM do not match the installed version of
    default: VirtualBox! In most cases this is fine, but in rare cases it can
    default: prevent things such as shared folders from working properly. If you see
    default: shared folder errors, please make sure the guest additions within the
    default: virtual machine match the version of VirtualBox you have installed on
    default: your host and reload your VM.
    default:
    default: Guest Additions Version: 6.0.0 r127566
    default: VirtualBox Version: 7.0

Which is very strange because if I check the version of VBoxControl from inside the VM I do get the correct version:

# VBoxControl --version
7.0.20r163906

This is a custom image which I build with packer so for debug purposes I kept the .vbox_version and the ISO (VBoxGuestAdditions.iso) around and those both show the correct version.

# cat .vbox_version
7.0.20

VBoxLinuxAdditions.run has

label="VirtualBox 7.0.20 Guest Additions for Linux"

Which make me wonder how Vagrant determines the version of Guest Additions.

Vagrant version

• Vagrant 2.4.1

Host operating system

• Ubuntu 24.04.1 LTS

Guest operating system

• Debian GNU/Linux 12 (bookworm)

Steps to reproduce

Hard to do without my image but let me know if I need to check some additional things.

Vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.configure("2") do |config|

  #config.vm.box = "debian-12.7.0-generic"
  config.vm.box = "debian-12.7.0-generic-ga-debug"

  config.vm.provider "virtualbox" do |v|
    v.gui = true
  end

end