Linux Kernel Exploitation: eBPF Case Study

"Understanding privilege escalation via malicious eBPF programs and verifier bypass."

PopDocs Intel

May 12, 2026

1 MIN

Linux Kernel & eBPF Security

eBPF has revolutionized observability and networking, but it has also introduced a new attack surface for kernel-level privilege escalation.

1. Verifier Bypass

The eBPF verifier is responsible for ensuring programs are safe to run. Inconsistencies in pointer arithmetic or boundary checks can lead to arbitrary kernel memory access.

2. Local Privilege Escalation (LPE)

By loading a specially crafted eBPF program, a non-privileged user can manipulate kernel structures to gain root shell.

Hardening Tips:

unprivileged_bpf_disabled: Set sysctl -w kernel.unprivileged_bpf_disabled=1.
KASLR: Kernel Address Space Layout Randomization.