CVE-2014-9717 Auth bypass in n/a
Local users can bypass mount restrictions to access hidden filesystem locations by exploiting a missing check in the Linux kernel's umount2 system call.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2014-9717?
CVE-2014-9717 is a medium-severity authentication bypass vulnerability in Linux kernel, published on 2 May 2016. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-284
Which versions are affected by CVE-2014-9717?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2014-9717?
Apply the vendor's patch.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2014-9717 being exploited?
There is no known exploitation of CVE-2014-9717 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2014-9717, GHSA-325x-3w5r-2xgh.