STIGQter: STIG Summary: Red Hat Enterprise Linux 9 Security Technical Implementation Guide Version: 2 Release: 9 Benchmark Date: 01 Jul 2026:

RHEL 9 must mount /dev/shm with the noexec option.

DISA Rule

SV-257864r1155639_rule

Vulnerability Number

V-257864

Group Title

SRG-OS-000368-GPOS-00154

Rule Version

RHEL-09-231115

Severity

CAT II

CCI(s)

• CCI-001764 - Prevent program execution in accordance with organization-defined policies, rules of behavior, and/or access agreements regarding software program usage and restrictions; rules authorizing the terms and conditions of software program usage.

Weight

10

Fix Recommendation

Configure "/dev/shm" to mount with the "noexec" option.

Modify "/etc/fstab" to use the "noexec" option on the "/dev/shm" file system.

To reload all implicit mount units and update the dependency graph so that new options will apply correctly at next remount, run the following command:

$ sudo systemctl daemon-reload

Use the following command to apply the changes immediately without a reboot:

$ sudo mount -o remount /dev/shm

Check Contents

Verify "/dev/shm" is mounted with the "noexec" option with the following command:

$ findmnt /dev/shm

/dev/shm tmpfs tmpfs rw,nodev,nosuid,noexec,seclabel

If the mount options for /dev/shm does not include noexec, this is a finding.

Vulnerability Number

V-257864

Documentable

False

Rule Version

RHEL-09-231115

Severity Override Guidance

Verify "/dev/shm" is mounted with the "noexec" option with the following command:

$ findmnt /dev/shm

/dev/shm tmpfs tmpfs rw,nodev,nosuid,noexec,seclabel

If the mount options for /dev/shm does not include noexec, this is a finding.

Check Content Reference

M

Target Key

5551