STIGQter: STIG Summary: Oracle Linux 9 Security Technical Implementation Guide Version: 1 Release: 6 Benchmark Date: 01 Jul 2026:

OL 9 must clear the page allocator to prevent use-after-free attacks.

DISA Rule

SV-271738r1092600_rule

Vulnerability Number

V-271738

Group Title

SRG-OS-000134-GPOS-00068

Rule Version

OL09-00-002394

Severity

CAT II

CCI(s)

• CCI-001084 - Isolate security functions from nonsecurity functions.

Weight

10

Fix Recommendation

Configure OL 9 to enable page poisoning with the following commands:

$ sudo grubby --update-kernel=ALL --args="page_poison=1"

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

GRUB_CMDLINE_LINUX="page_poison=1"

Check Contents

Verify that OL 9 clears the page allocator to prevent use-after-free attacks.

Verify that GRUB 2 is configured to enable page poisoning to mitigate use-after-free vulnerabilities.

Check that the current GRUB 2 configuration has page poisoning enabled with the following command:

$ sudo grubby --info=ALL | grep args | grep -v 'page_poison=1'

If any output is returned, this is a finding.

Check that page poisoning is enabled by default to persist in kernel updates with the following command:

$ grep page_poison /etc/default/grub
GRUB_CMDLINE_LINUX="page_poison=1"

If "page_poison" is not set to "1", is missing or commented out, this is a finding.

Vulnerability Number

V-271738

Documentable

False

Rule Version

OL09-00-002394

Severity Override Guidance

Verify that OL 9 clears the page allocator to prevent use-after-free attacks.

Verify that GRUB 2 is configured to enable page poisoning to mitigate use-after-free vulnerabilities.

Check that the current GRUB 2 configuration has page poisoning enabled with the following command:

$ sudo grubby --info=ALL | grep args | grep -v 'page_poison=1'

If any output is returned, this is a finding.

Check that page poisoning is enabled by default to persist in kernel updates with the following command:

$ grep page_poison /etc/default/grub
GRUB_CMDLINE_LINUX="page_poison=1"

If "page_poison" is not set to "1", is missing or commented out, this is a finding.

Check Content Reference

M

Target Key

5680