Title: Security  - Immanuel Raj

---

# Category: Security

 * [⌊How I Audited 41 Ubuntu Servers for CVE-2026-31431 “Copy Fail” — and What I
   Found⌉⌊How I Audited 41 Ubuntu Servers for CVE-2026-31431 “Copy Fail” — and What
   I Found⌉[
 * 
   ## 󠀁[How I Audited 41 Ubuntu Servers for CVE-2026-31431 “Copy Fail” — and What I Found](https://immanuelraj.dev/copy-fail-cve-2026-31431-ubuntu-audit/)󠁿
   
 * [May 5, 2026](https://immanuelraj.dev/copy-fail-cve-2026-31431-ubuntu-audit/)
 * —
 * by
 * [Immanuel Raj](https://immanuelraj.dev/author/iamimmanuelraj/)
 * in [Linux](https://immanuelraj.dev/category/linux/), [Security](https://immanuelraj.dev/category/security/),
   [Self Hosting](https://immanuelraj.dev/category/self-hosting/)
 * Read Time
 * 5–8 minutes
 * CVE-2026-31431 “Copy Fail” is a HIGH severity Linux kernel vulnerability that
   lets any local user gain root. I audited all 41 of my Ubuntu servers, found one
   actively exposed, applied the mitigation, and checked for compromise. Here’s 
   the full technical breakdown.
 * 
   ## 󠀁[Cloudflare Header Tips](https://immanuelraj.dev/cloudflare-header-tips/)󠁿
   
 * [April 3, 2024](https://immanuelraj.dev/cloudflare-header-tips/)
 * —
 * by
 * [Immanuel Raj](https://immanuelraj.dev/author/iamimmanuelraj/)
 * in [Cloudflare](https://immanuelraj.dev/category/cloudflare/), [Security](https://immanuelraj.dev/category/security/),
   [Self Hosting](https://immanuelraj.dev/category/self-hosting/), [SSL](https://immanuelraj.dev/category/ssl/),
   [Web](https://immanuelraj.dev/category/web/)
 * Read Time
 * 2–3 minutes
 * I am pretty sure any developer would have known about cloudflare. Be it for Hosting,
   Ai, Storage, Mail, Security, Infra, Tunnels, DNS etc. When you are a guy who 
   uses free stuff to get things done for you, you cannot pay for things that you
   want, but also cannot stop from getting good things. Not…