Copy Fail, tracked as CVE-2026-31431, has emerged as a serious threat to Linux systems. The flaw allows local unprivileged users to elevate their privileges to root, putting millions of installations at risk. According to the report, the vulnerability affects nearly all Linux kernel versions released since 2017. As of 1 May 2026, the fix had already been merged into the mainline Linux kernel, but many distributions had not yet incorporated the patch into their own builds. This creates a dangerous window of exposure, especially for environments that delay kernel updates. Copy Fail stems from a logical flaw in the Linux kernel’s cryptographic AEAD implementation...