Should You Be Worried About The Copy Fail Linux Exploit?
It's FOSS, Wednesday, May 6th, 2026
A 9-year-old Linux kernel vulnerability allows unprivileged users to escalate to root, but patches are already available.
A logic flaw in the Linux kernel discovered in 2017 was recently disclosed as CVE-2026-31431, known as "Copy Fail." The vulnerability allows unprivileged local users to escalate privileges to root using a small 732-byte Python script by exploiting a cryptographic subsystem.
The flaw has already been patched in the Linux kernel, with the fix committed on April 1, though risk levels vary depending on usage context - cloud environments and containers face high risk, while personal desktops face lower risk. CISA has added it to its Known Exploited Vulnerabilities catalog and ordered US federal agencies to patch by May 15.