STIGQter: STIG Summary: Red Hat OpenShift Container Platform 4.x Security Technical Implementation Guide Version: 2 Release: 6 Benchmark Date: 01 Jul 2026:

OpenShift must enable poisoning of SLUB/SLAB objects.

DISA Rule

SV-257550r1137645_rule

Vulnerability Number

V-257550

Group Title

SRG-APP-000243-CTR-000600

Rule Version

CNTR-OS-000580

Severity

CAT II

CCI(s)

• CCI-001090 - Prevent unauthorized and unintended information transfer via shared system resources.

Weight

10

Fix Recommendation

Apply the machine config to enable poisoning of SLUB/SLAB objects by executing the following:

for mcpool in $(oc get mcp -oname | sed "s:.*/::" ); do
echo "apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
name: 05-kernelarg-slub-debug-$mcpool
labels:
machineconfiguration.openshift.io/role: $mcpool
spec:
config:
ignition:
version: 3.1.0
kernelArguments:
- slub_debug=P
" | oc apply -f -
done

Check Contents

Verify that Red Hat Enterprise Linux CoreOS (RHCOS) is configured to enable poisoning of SLUB/SLAB objects to mitigate use-after-free vulnerabilities by executing the following:

for node in $(oc get node -oname); do oc debug $node -- chroot /host /bin/bash -c 'echo -n "$HOSTNAME "; grep slub_debug /boot/loader/entries/*.conf ' 2>/dev/null; done

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

Vulnerability Number

V-257550

Documentable

False

Rule Version

CNTR-OS-000580

Severity Override Guidance

Verify that Red Hat Enterprise Linux CoreOS (RHCOS) is configured to enable poisoning of SLUB/SLAB objects to mitigate use-after-free vulnerabilities by executing the following:

for node in $(oc get node -oname); do oc debug $node -- chroot /host /bin/bash -c 'echo -n "$HOSTNAME "; grep slub_debug /boot/loader/entries/*.conf ' 2>/dev/null; done

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

Check Content Reference

M

Target Key

5547