Introduction to Malware Binary Triage (IMBT) Course
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On April 29, 2026, security researchers publicly disclosed a critical Linux kernel vulnerability known as CVE-2026-31431, also called Copy Fail. This vulnerability is caused by a logic flaw in the kernel, which allows any unprivileged local user to gain root access. Copy Fail has a CVSS score of 7.8 (High) and a publicly available exploit that works reliably across multiple Linux environments. The same exploit can compromise Ubuntu, Amazon Linux, RHEL, and SUSE without any modification. It can also be used as a container escape technique in shared kernel environments, including Kubernetes clusters, CI pipelines, and AI code execution platforms.
Article Link: Copy Fail: Critical Linux Kernel Privilege Escalation Vulnerability - CVE-2026-31431