TOSS 5 must disable access to network bpf system call from nonprivileged processes.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-282508 | TOSS-05-000109 | SV-282508r1200504_rule | CCI-001082 | medium |
| Description | ||||
| Loading and accessing the packet filters programs and maps using the "bpf()" system call has the potential of revealing sensitive information about the kernel state. | ||||
| STIG | Date | |||
| Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide | 2026-04-01 | |||
Details
Check Text (C-282508r1200504_chk)
Verify TOSS 5 prevents privilege escalation through the kernel by disabling access to the bpf system call using the following command:
$ sudo 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.
Fix Text (F-86974r1200503_fix)
Configure TOSS 5 to prevent privilege escalation through the kernel by disabling access to the bpf syscall by adding the following line to a file, in the "/etc/sysctl.d" directory:
kernel.unprivileged_bpf_disabled = 1
The system configuration files must be reloaded for the changes to take effect. To reload the contents of the files, run the following command:
$ sudo sysctl --system