A vulnerability found in the Linux kernel, specifically a flaw in fault handling associated with the Stack Segment (SS), allows an unprivileged user to potentially gain privileges. CentOS 4, CentOS 5, CentOS 6, and CentOS 7 are potentially affected, thus we want to highlight the following information.
To verify your kernel has at least downloaded the patch you can run the following command on your server:
rpm -q --changelog kernel | grep CVE-2014-9322
If your server has the patch, then you should receive the following response:
Be sure to reboot your server after the patch is installed.
We also have tutorials on How To Update the Kernel in CentOS / Red Hat and How To Check the Kernel Version in Linux / Ubuntu / CentOS.
The National Vulnerability Database describes the issue as follows:
The Linux kernel before 3.17.5 does not properly handle faults associated with the Stack Segment (SS) segment register, which allows local users to gain privileges by triggering an IRET instruction that leads to access to a GS Base address from the wrong space.