TOSS 5 must enable hardening for the Berkeley Packet Filter (BPF) just-in-time (JIT) compiler.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-282677 | SRG-OS-000480-GPOS-00227 | TOSS-05-000199 | SV-282677r1201330_rule | 2026-04-01 | 1 |
Description
When hardened, the extended BPF JIT compiler will randomize any kernel addresses in the BPF programs and maps and will not expose the JIT addresses in "/proc/kallsyms".
ℹ️ Check
Verify TOSS 5 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.
Check that the configuration files are present to enable this kernel parameter.
$ sudo /usr/lib/systemd/systemd-sysctl --cat-config | egrep -v '^(#|;)' | grep -F net.core.bpf_jit_harden | tail -1
net.core.bpf_jit_harden = 2
If the network parameter "net.core.bpf_jit_harden" is not equal to "2" or nothing is returned, this is a finding.
✔️ Fix
Configure TOSS 5 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
Reload the system configuration files for the changes to take effect.
$ sudo sysctl --system