How to check your kernel’s vulnerability to CopyFail (CVE-2026-31431) using Kernel Checker on vmlinuz.pl. One minute and you know.
Posts for: #Security
CopyFail (CVE-2026-31431) — 9 Years of Hidden Privilege Escalation in the Kernel
CVE-2026-31431 CopyFail — deterministic local privilege escalation via the algif_aead module. How it works, what’s affected, and how to protect yourself.
Linux 7.0 Officially Released — Key Changes Overview
Linux 7.0 hit mainline on April 12, 2026. Self-healing XFS, post-quantum module signatures, 12% faster UDP receive, Rust goes permanent, and more.
Kernel Hardening Part 3 — Check Your Boot Parameters
Kernel Security Checker now checks kernel boot parameters. Make sure your cmdline isn’t disabling security features.
Kernel Hardening Part 2 — Check Your Sysctl Settings
Kernel Security Checker now supports sysctl. Check your kernel runtime settings without recompiling.
Path Traversal — How Attackers Read Files from Your Server
What is path traversal, how it works, bypass techniques attackers use, and how to defend against it.
Linux 7.0 — What Does the New Version Number Change?
Overview of Linux 7.0 kernel changes — Rust officially in the kernel, memory management improvements, scheduler, new drivers, HIPPI removal and more.
REST API — HTTP Method Override and Its Consequences
How to override HTTP methods in flight, why it works, and what the security consequences are for REST APIs.
Kernel Hardening — Check Your Kernel Security in 30 Seconds
How to quickly check if your kernel configuration is secure. Upload your .config file and see what needs fixing.
What’s New in Linux Kernel 6.19?
An overview of the most important changes in Linux kernel 6.19 — Live Update, the new listns() syscall, Btrfs and ext4 improvements, HDR, io_uring, and Rust in the kernel.