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

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

DISA Rule

SV-257810r1198253_rule

Vulnerability Number

V-257810

Group Title

SRG-OS-000132-GPOS-00067

Rule Version

RHEL-09-213075

Severity

CAT II

CCI(s)

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

Weight

10

Fix Recommendation

Configure RHEL 9 to prevent privilege escalation through the kernel by disabling access to the bpf system call.

Create the drop-in file if it does not already exist:

$ sudo vi /etc/sysctl.d/99-kernel_unprivileged_bpf_disabled.conf

Add the following line to the file:
kernel.unprivileged_bpf_disabled = 1

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

$ sudo sysctl --system

Check Contents

Verify RHEL 9 prevents privilege escalation through the kernel by disabling access to the bpf system call.

Check the status of the "kernel.unprivileged_bpf_disabled" kernel parameter with the following command:

$ sysctl kernel.unprivileged_bpf_disabled
kernel.unprivileged_bpf_disabled = 1

If "kernel.unprivileged_bpf_disabled" is not set to "1", or is missing, this is a finding.

Vulnerability Number

V-257810

Documentable

False

Rule Version

RHEL-09-213075

Severity Override Guidance

Verify RHEL 9 prevents privilege escalation through the kernel by disabling access to the bpf system call.

Check the status of the "kernel.unprivileged_bpf_disabled" kernel parameter with the following command:

$ sysctl kernel.unprivileged_bpf_disabled
kernel.unprivileged_bpf_disabled = 1

If "kernel.unprivileged_bpf_disabled" is not set to "1", or is missing, this is a finding.

Check Content Reference

M

Target Key

5551