RHEL 9 must use a separate file system for /tmp.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-257844	RHEL-09-231015	SV-257844r1044918_rule		Medium

Description

The "/tmp" partition is used as temporary storage by many programs. Placing "/tmp" in its own partition enables the setting of more restrictive mount options, which can help protect programs that use it.

STIG	Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide	2025-05-14

Details

Check Text (C-61585r1044917_chk)

Verify that a separate file system/partition has been created for "/tmp" with the following command:

$ mount | grep /tmp

/dev/mapper/rhel-tmp on /tmp type xfs (rw,nodev,nosuid,noexec,seclabel)

If a separate entry for "/tmp" is not in use, this is a finding.

Fix Text (F-61509r925518_fix)

Migrate the "/tmp" path onto a separate file system.