STIGQter: STIG Summary: Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide Version: 1 Release: 7 Benchmark Date: 01 Jul 2026:

AlmaLinux OS 9 must disable access to network bpf system call from nonprivileged processes.

DISA Rule

SV-269422r1198253_rule

Vulnerability Number

V-269422

Group Title

SRG-OS-000132-GPOS-00067

Rule Version

ALMA-09-040720

Severity

CAT II

CCI(s)

CCI-001082 - Separate user functionality, including user interface services, from system management functionality.

Weight

Fix Recommendation

Configure AlmaLinux OS 9 to prevent privilege escalation through the kernel by disabling access to the bpf syscall with the following command:

$ echo "kernel.unprivileged_bpf_disabled = 1" > /etc/sysctl.d/60-bpf.conf

Load settings from all system configuration files with the following command:

$ sysctl --system

Check Contents

Verify AlmaLinux OS 9 prevents privilege escalation thru the kernel by disabling access to the bpf system call with the following commands:

$ sysctl kernel.unprivileged_bpf_disabled

kernel.unprivileged_bpf_disabled = 1

If the returned line does not have a value of "1", or a line is not returned, this is a finding.

Check that the configuration files are present to enable this kernel parameter.

$ /usr/lib/systemd/systemd-sysctl --cat-config | egrep -v '^(#|;)' | grep -F kernel.unprivileged_bpf_disabled | tail -1

kernel.unprivileged_bpf_disabled = 1

If "kernel.unprivileged_bpf_disabled" is not set to "1", or nothing is returned, this is a finding.

Vulnerability Number

V-269422

Documentable

False

Rule Version

ALMA-09-040720

Severity Override Guidance

Check Content Reference

Target Key

5664