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

OL 9 must clear SLUB/SLAB objects to prevent use-after-free attacks.

DISA Rule

SV-271734r1091914_rule

Vulnerability Number

V-271734

Group Title

SRG-OS-000433-GPOS-00192

Rule Version

OL09-00-002390

Severity

CAT II

CCI(s)

• CCI-002824 - Implement organization-defined controls to protect its memory from unauthorized code execution.
• CCI-001084 - Isolate security functions from nonsecurity functions.

Weight

10

Fix Recommendation

Configure OL 9 to enable poisoning of SLUB/SLAB objects with the following commands:

$ sudo grubby --update-kernel=ALL --args="slub_debug=P"

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

GRUB_CMDLINE_LINUX="slub_debug=P"

Check Contents

Verify that OL 9 GRUB 2 is configured to enable poisoning of SLUB/SLAB objects to mitigate use-after-free vulnerabilities with the following commands:

Check that the current GRUB 2 configuration has poisoning of SLUB/SLAB objects enabled:

$ sudo grubby --info=ALL | grep args | grep -v 'slub_debug=P'
If any output is returned, this is a finding.

Check that poisoning of SLUB/SLAB objects is enabled by default to persist in kernel updates:

$ sudo grep slub_debug /etc/default/grub
GRUB_CMDLINE_LINUX="slub_debug=P"

If "slub_debug" is not set to "P", is missing or commented out, this is a finding.

Vulnerability Number

V-271734

Documentable

False

Rule Version

OL09-00-002390

Severity Override Guidance

Verify that OL 9 GRUB 2 is configured to enable poisoning of SLUB/SLAB objects to mitigate use-after-free vulnerabilities with the following commands:

Check that the current GRUB 2 configuration has poisoning of SLUB/SLAB objects enabled:

$ sudo grubby --info=ALL | grep args | grep -v 'slub_debug=P'
If any output is returned, this is a finding.

Check that poisoning of SLUB/SLAB objects is enabled by default to persist in kernel updates:

$ sudo grep slub_debug /etc/default/grub
GRUB_CMDLINE_LINUX="slub_debug=P"

If "slub_debug" is not set to "P", is missing or commented out, this is a finding.

Check Content Reference

M

Target Key

5680