OL 9 must enable hardening for the Berkeley Packet Filter (BPF) just-in-time compiler.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-271768 | OL09-00-002430 | SV-271768r1092016_rule | Medium |
| Description |
| When hardened, the extended BPF just-in-time (JIT) compiler will randomize any kernel addresses in the BPF programs and maps and will not expose the JIT addresses in "/proc/kallsyms". |
| STIG | Date |
| Oracle Linux 9 Security Technical Implementation Guide | 2025-05-08 |
Details
| Check Text (C-75818r1092014_chk) |
| Verify that OL 9 enables hardening for the BPF JIT with the following commands: $ sudo sysctl net.core.bpf_jit_harden net.core.bpf_jit_harden = 2 If the returned line does not have a value of "2", or a line is not returned, this is a finding. |
| Fix Text (F-75725r1092015_fix) |
| Configure OL 9 to enable hardening for the BPF JIT compiler by adding the following line to a file, in the "/etc/sysctl.d" directory: net.core.bpf_jit_harden = 2 The system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command: $ sudo sysctl --system |