• CopyFail

CopyFail

• https://copy.fail/

• https://en.wikipedia.org/wiki/Copy_Fail

CVE-2026-31431 - If your kernel was built between 2017 and the patch — which covers essentially every mainstream Linux distribution — you're in scope.

Copy Fail requires only an unprivileged local user account — no network access, no kernel debugging features, no pre-installed primitives. The kernel crypto API (AF_ALG) ships enabled in essentially every mainstream distro's default config, so the entire 2017 → patch window is in play out of the box.

Disable algif_aead module

   1 sudo bash
   2 echo "install algif_aead /bin/false" > /etc/modprobe.d/disable-algif.conf
   3 rmmod algif_aead