TLDR Tech / DevOps
How Cloudflare responded to the “Copy Fail” Linux vulnerability
Cloudflare successfully defended against the "Copy Fail" Linux kernel vulnerability (CVE-2026-31431) disclosed on April 29, deploying a custom eBPF-based mitigation across its 330-city infrastructure within hours while confirming zero customer impact through fleet-wide behavioral detection and forensic analysis. The company's existing security monitoring flagged internal exploit validation attempts within minutes without signature updates, and engineers used BPF Linux Security Module programs to surgically block the vulnerable code path while awaiting patched kernel deployment across hundreds of thousands of servers.
Read the full story