AlmaLinux OS 9 must mount /tmp with the nodev option.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-269317	ALMA-09-026860	SV-269317r1050199_rule		Medium

Description

The "nodev" mount option causes the system to not interpret character or block special devices. Executing character or block special devices from untrusted file systems increases the opportunity for nonprivileged users to attain unauthorized administrative access. The only legitimate location for device files is the "/dev" directory located on the root partition, with the exception of chroot jails if implemented.

STIG	Date
CloudLinux AlmaLinux OS 9 Security Technical Implementation Guide	2025-05-22

Details

Check Text (C-73348r1048327_chk)

Verify "/tmp" is mounted with the "nodev" option:

$ mount | grep ' /tmp'

tmpfs on /tmp type tmpfs (rw,nosuid,nodev,noexec,relatime,seclabel,size=2097152k,inode64)

If the "/tmp" file system is mounted without the "nodev" option, this is a finding.

Fix Text (F-73249r1048328_fix)

Modify "/etc/fstab" to use the "nodev" option on the "/tmp" directory.