[Bug]: EFI DmiSystemSerial causes VERR_CFGM_VALUE_NOT_FOUND on Apple Silicon

[suaveolent]

Version

7.2.14

Host OS Type

macOS

Host OS name + version

macOS 26.6

Host Architecture

ARM

Guest OS Type

Windows

Guest Architecture

ARM

Guest OS name + version

Windows 11 25H2

Component

Unspecified

What happened?

On VirtualBox 7.2.14 running on an Apple Silicon Mac, configuring an EFI Windows ARM64 VM with:
VBoxInternal/Devices/efi/0/Config/DmiSystemSerial
causes the VM to fail during startup with:

VBoxManage: error: Configuration error: Querying "UUID" failed (VERR_CFGM_VALUE_NOT_FOUND)
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component ConsoleWrap, interface IConsole

The DMI serial value is successfully accepted into the EFI configuration tree and appears correctly in VBox.log, but the VM cannot start.

Removing the DMI serial override immediately restores normal VM startup.
This prevents using a VirtualBox Windows ARM64 VM for testing Windows Autopilot scenarios that require a usable BIOS/SMBIOS serial number.

How can we reproduce this?

1. Create a Windows 11 ARM64 VM on an Apple Silicon Mac.
2. Configure the VM to use EFI firmware.
3. Confirm the VM starts normally.
4. Power off the VM.
5. Set an EFI DMI serial number:

 VBoxManage setextradata "VB-Windows"  "VBoxInternal/Devices/efi/0/Config/DmiSystemSerial"  "VB-57335a386415"

6. Confirm the setting:
   VBoxManage getextradata "VB-Windows" enumerate
7. Expected:
   Key: VBoxInternal/Devices/efi/0/Config/DmiSystemSerial, Value: string:VB-57335a386415
8. Start the VM:
   VBoxManage startvm "VB-Windows"
9. Observe:

VBoxManage: error: Configuration error: Querying "UUID" failed (VERR_CFGM_VALUE_NOT_FOUND)
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component ConsoleWrap, interface IConsole

10. Remove the serial override:
    VBoxManage setextradata "VB-Windows" "VBoxInternal/Devices/efi/0/Config/DmiSystemSerial"
11. Start the VM again.
12. The VM starts successfully.

Did you upload all of your necessary log files, screenshots, etc.?

• Yes, I've uploaded all pertinent files to this issue.