A high‑severity Linux kernel flaw (CVE‑2026‑31431, dubbed "Copy Fail") allows ordinary users to gain root privileges and escape containers via an AF_ALG and splice() optimization bug, affecting major distributions; the article details the vulnerability, exploitation steps, PoC, and mitigation guidance.
This guide explains the purpose of the PREEMPT‑RT (real‑time) patch, details the hardware and toolchain used, describes the patch's key features and modifications, provides step‑by‑step instructions for downloading, applying, configuring, compiling, and flashing the kernel, and shows how to verify latency improvements with cyclictest and stress‑ng across idle and CPU‑stress scenarios.
A Linux kernel bug caused virtual Ethernet (veth) devices in container environments to ignore TCP checksum validation, leading to corrupted data reaching applications, and the article explains the incident, investigation, reproducible tests, root cause in the veth driver, and the patch that resolves the issue.
