How Cloudflare responded to the “Copy Fail” Linux vulnerability

Cloudflare responded to the Copy Fail Linux vulnerability (CVE-2026-31431) with no customer impact.

• •The vulnerability exploits AF_ALG sockets and page cache for privilege escalation via setuid binary manipulation.
• •Cloudflare manages custom Linux kernels across 330 datacenters with automated builds and four-week rollout cycles.
• •Behavioral detection flagged the exploit within minutes without new signatures.
• •Security found no pre-disclosure exploitation evidence; engineering deployed mitigations with zero disruption.

This summary was automatically generated by AI based on the original article and may not be fully accurate.