Copy.Fail (CVE-2026-31431): How to Rapidly Protect OVHcloud MKS Clusters from the Linux Kernel Zero-Day
A newly disclosed Linux kernel zero-day, CVE-2026-31431, “Copy.Fail”, is one of the most serious privilege-escalation vulnerabilities in recent years. Discovered by Theori and publicly disclosed on April 29, 2026, Copy.Fail is a Linux kernel zero-day that roots every distribution since 2017. Unlike many local privilege-escalation flaws that depend on race conditions, kernel address leaks, or […]










