"Copy Fail" Vulnerability (CVE-2026-31431): Linux Kernel Privilege Escalation
CVE-2026-31431— the “Copy Fail” vulnerability—is a critical local privilege escalation (LPE) flaw in the Linux kernel’s cryptographic subsystem that allows unprivileged users to gain root access with near-perfect reliability. Boasting a CVSS score of 7.8 and affecting nearly every mainstream distribution since 2017 (including Ubuntu, RHEL, and Amazon Linux), Copy Fail has been added to the CISA KEV catalog due to its active exploitation and portable, low-footprint nature.