The US government has issued a warning about a severe security vulnerability, named CopyFail, affecting major versions of the Linux operating system. The flaw, which allows attackers to gain complete control of affected systems, has prompted urgent calls for patching after exploit code was publicly released.
According to verified reports, the vulnerability impacts a wide range of Linux distributions, including Red Hat, Ubuntu, and Debian. The US Cybersecurity and Infrastructure Security Agency (CISA) added the flaw to its Known Exploited Vulnerabilities catalog, urging federal agencies to apply patches by May 26, 2026.
Security researchers disclosed the vulnerability after discovering that the exploit code could be used to execute arbitrary code with kernel-level privileges. The flaw is believed to stem from a memory management issue in the Linux kernel's copy-on-write mechanism.
Administrators are advised to update their systems immediately. Patches are available from major distributions, and users should verify their systems are running the latest kernel versions to mitigate the risk.
