### [CVE-2014-9717](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9717)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

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.

### POC

#### Reference
- http://www.openwall.com/lists/oss-security/2015/04/17/4

#### Github
No PoCs found on GitHub currently.