CVE-2014-9717: Linux Kernel

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

fs/namespace.c in the Linux kernel before 4.0.2 processes MNT_DETACH umount2 system calls without verifying that the MNT_LOCKED flag is unset, which allows local users to bypass intended access restrictions and navigate to filesystem locations beneath a mount by calling umount2 within a user namespace.

Affected products

• Linux Linux Kernel: up to and including 4.0.1

Published 2016-05-02. Last modified 2026-06-17.