Introduction to seccomp

I’ve seen seccomp, short for “secure computing,” become an essential tool in my Linux toolkit. It’s a Linux kernel feature that lets you filter system calls, effectively limiting what a process can do. This is especially useful when running containers - it helps prevent a compromised container from causing damage to the host system. In this article, I’ll explore how to use seccomp to lock down container privileges in Linux.

Introduction to AppArmor

I’ve been using AppArmor for years to add an extra layer of security to my Linux systems. It’s a Mandatory Access Control (MAC) system that lets you restrict what applications and services can do. By defining a set of rules, you can control file access, network connections, and system calls. This helps prevent malicious activities and gives you more peace of mind.

Installing and Enabling AppArmor

To get started with AppArmor, you’ll need to install the apparmor package. On Debian-based systems, I usually start with:

Introduction to Kernel Lockdown Mode

I’ve been using Linux for years, and one feature that’s really caught my attention is Kernel Lockdown Mode. This security feature restricts access to certain kernel features, making it more difficult for an attacker to escalate privileges or modify the kernel. It was introduced in Linux kernel 5.4, back in 2019, and has been improved in subsequent releases. As of 2026, Kernel Lockdown Mode is a mature feature that can be easily enabled on most Linux distributions.

Linux Kernel Vulnerabilities and Exploitation

As a Senior Linux Security Architect, I have witnessed the evolution of Linux kernel vulnerabilities and exploitation techniques over the years. In 2025, we saw a significant increase in the number of reported vulnerabilities, with many of them being critical in nature. In this blog post, we will discuss the current trends in Linux kernel vulnerabilities and exploitation in 2026.

Introduction to Linux Kernel Vulnerabilities

The Linux kernel is a complex and widely used operating system, which makes it a prime target for attackers. In 2025, we saw a number of high-profile vulnerabilities, including CVE-2022-32250, which allowed attackers to escalate privileges and gain control of the system. These types of vulnerabilities are a major concern for system administrators and security professionals.

Linux Kernel Vulnerability Mitigations and Exploit Development

Introduction

As we move forward in 2026, it’s essential to reflect on the Linux kernel vulnerability landscape of 2025 and how it has shaped the current trends in exploit development and mitigation. In 2025, the Linux kernel community witnessed a significant number of vulnerabilities, including CVE-2022-4378 and others, which were promptly addressed through kernel updates and patches. This blog post will delve into the current state of Linux kernel vulnerability mitigations and exploit development, highlighting key trends, techniques, and best practices for security professionals.

Exploiting the Linux Kernel for Fun and Profit: A KSPP Perspective

The Linux kernel is a complex, ever-evolving entity that underpins the majority of the world’s operating systems. As such, its security is of paramount importance. Recent developments in the Kernel Self Protection Project (KSPP) have bolstered the kernel’s defenses against an array of attacks. In this article, we’ll delve into the technical implementation of these security features and explore how they mitigate various MITRE ATT&CK techniques.

Bypassing the Kernel Verifier: Advanced eBPF Exploitation in 2026

The Linux kernel’s eBPF (extended Berkeley Packet Filter) subsystem has become a focal point for both security researchers and attackers alike. With its ability to execute arbitrary code in kernel space, eBPF has opened up new avenues for exploitation. Recently, we’ve seen a surge in advanced eBPF exploitation techniques that bypass the kernel verifier, allowing attackers to execute malicious code with elevated privileges.

Introduction to Linux Kernel Hardening with eBPF

The Linux kernel is a critical component of the operating system, responsible for managing hardware resources and providing services to applications. However, its complexity and ubiquity make it a prime target for attackers. Recent CVEs (Common Vulnerabilities and Exposures) and MITRE ATT&CK techniques have highlighted the need for robust security measures to protect the Linux kernel. One effective approach is to leverage eBPF (extended Berkeley Packet Filter)-based security tools for hardening the kernel.

Security-Enhanced Linux (SELinux) is a security module integrated into the Linux kernel that provides a mechanism for enforcing mandatory access controls (MAC). Unlike traditional discretionary access controls (DAC), which rely on user permissions, SELinux applies security policies that define what actions processes and users can perform on a system. This results in a more robust security model, minimizing the risk of privilege escalation and unauthorized access.

Why Use SELinux?

SELinux enhances the security of Linux systems by enforcing strict access controls. It is particularly useful for environments where security is a priority, such as servers, enterprise systems, and containers. Key benefits include:

Security is a crucial aspect of any Linux system. To maintain a secure environment, it’s important to monitor activities, track events, and log significant changes. The Linux Audit system provides a comprehensive framework for auditing and logging, enabling administrators to monitor user activity, detect security violations, and meet compliance requirements.

What is the Linux Audit System?

The Linux Audit system is a powerful tool that logs system events based on user-defined rules. It records detailed information about activities such as file access, configuration changes, and authentication attempts. The logs generated by the Audit system can help identify unusual behavior or unauthorized access, providing an essential layer of security.