Question: Assume a computer runs dual boot (the computer can be booted from one of the two operating systems at the same time). We supposed that

Assume a computer runs dual boot (the computer can be booted from one of the two operating systems at the same time). We supposed that the administrator (root user) of the first operating system made a password for the grub2 bootloader and removed unrestricted for the first entry in the grub.cfg file. If an attacker can log in the OS on the second entry (assuming that he knows the root password for the OS on the second entry), is he able to change the root users password for the OS on the first entry? Yes, why? No, why?

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