Canonical has published new Linux kernel security updates for all of its supported Ubuntu OS releases addressing up to six security vulnerabilities affecting all supported kernels. Patch now!

The most important flaw patched in this new Ubuntu kernel security update is CVE-2021-3178, which was discovered in Linux kernel’s NFS implementation and affects the Ubuntu 20.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS releases. This could allow a remote attacker to bypass NFS access restrictions and traverse to other parts of the filesystem via READDIRPLUS when there’s an NFS export of a subdirectory of a file system.