← Back to Red Hat Enterprise Linux 10 Security Technical Implementation Guide

V-281335

CAT II (Medium)

RHEL 10 must disable access to the network bpf system call from nonprivileged processes.

Rule ID

SV-281335r1167155_rule

STIG

Red Hat Enterprise Linux 10 Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-001082

Discussion

Loading and accessing the packet filters programs and maps using the bpf() system call has the potential to reveal sensitive information about the kernel state.

Check Content

Verify RHEL 10 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.

Fix Text

Configure RHEL 10 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

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