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

RHEL 9 must enable mitigations against processor-based vulnerabilities.

DISA Rule

SV-257795r1044845_rule

Vulnerability Number

V-257795

Group Title

SRG-OS-000433-GPOS-00193

Rule Version

RHEL-09-212050

Severity

CAT III

CCI(s)

• CCI-000381 - Configure the system to provide only organization-defined mission essential capabilities.
• CCI-002824 - Implement organization-defined controls to protect its memory from unauthorized code execution.

Weight

10

Fix Recommendation

Configure RHEL 9 to enable kernel page-table isolation with the following command:

$ sudo grubby --update-kernel=ALL --args="pti=on"

Add or modify the following line in "/etc/default/grub" to ensure the configuration survives kernel updates:

GRUB_CMDLINE_LINUX="pti=on"

Check Contents

Verify RHEL 9 enables kernel page-table isolation with the following command:

$ sudo grubby --info=ALL | grep args | grep -v 'pti=on'

If any output is returned, this is a finding.

Check that kernel page-table isolation is enabled by default to persist in kernel updates:

$ grep pti /etc/default/grub

GRUB_CMDLINE_LINUX="pti=on"

If "pti" is not set to "on", is missing or commented out, this is a finding.

Vulnerability Number

V-257795

Documentable

False

Rule Version

RHEL-09-212050

Severity Override Guidance

Verify RHEL 9 enables kernel page-table isolation with the following command:

$ sudo grubby --info=ALL | grep args | grep -v 'pti=on'

If any output is returned, this is a finding.

Check that kernel page-table isolation is enabled by default to persist in kernel updates:

$ grep pti /etc/default/grub

GRUB_CMDLINE_LINUX="pti=on"

If "pti" is not set to "on", is missing or commented out, this is a finding.

Check Content Reference

M

Target Key

5551