RHEL 10 must require a unique superusers name upon booting into single-user and maintenance modes.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-281167 | SRG-OS-000080-GPOS-00048 | RHEL-10-600010 | SV-281167r1166453_rule | 2026-03-11 | 1 |
Description
Having a nondefault grub superuser username makes password-guessing attacks less effective.
ℹ️ Check
Verify RHEL 10 requires a unique superusers name upon booting into single-user and maintenance modes.
Verify that the boot loader superuser account has been set with the following command:
$ sudo grep -A1 "superusers" /etc/grub2.cfg
set superusers="<accountname>"
export superusers
password_pbkdf2 <accountname> ${GRUB2_PASSWORD}
Verify <accountname> is not a common name such as root, admin, or administrator.
If superusers contains easily guessable usernames, this is a finding.
✔️ Fix
Configure RHEL 10 to have a unique username for the grub superuser account.
Edit the "/etc/grub.d/01_users" file and add or modify the following lines with a nondefault username for the superuser account:
set superusers="<accountname>"
export superusers
Once the superuser account has been added, update the "grub.cfg" file by regenerating the GRUB configuration with the following command:
$ sudo grub2-mkconfig -o /boot/grub2/grub.cfg --update-bls-cmdline
Reboot the system:
$ sudo reboot