Why am I not able to select bridge (br0 or xenbr0) in virt-manager after running CIS hardening scripts on the system?

Solution Verified - Updated -

Issue

  • After running CIS hardening scripts on the host system, I am not able to select the bridge interface (br0, xenbr0 and etc) in the "Network" -> "Shared Physical device" page while creating a new virtual machine using virt-manager.

  • VM creation with virsh is not affected.

  • This problem is also found while adding additional network interfaces to already created guests.

Environment

  • Red Hat Enterprise Linux Server release 5.5 (Tikanga) 64-bit

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