[USN-2598-2] Linux kernel regression

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==========================================================================
Ubuntu Security Notice USN-2598-2
May 09, 2015

linux vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 LTS

Summary:

USN-2598-1 Introduced a regression in the Linux kernel.

Software Description:
- linux: Linux kernel

Details:

USN-2598-1 fixed vulnerabilities in the Linux kernel, however an unrelated
regression in the auditing of some path names was introduced. Due to the
regression the system could crash under certain conditions.

This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

A race condition between chown() and execve() was discovered in the Linux
kernel. A local attacker could exploit this race by using chown on a
setuid-user-binary to gain administrative privileges.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 LTS:
linux-image-3.13.0-52-generic 3.13.0-52.86
linux-image-3.13.0-52-generic-lpae 3.13.0-52.86
linux-image-3.13.0-52-lowlatency 3.13.0-52.86
linux-image-3.13.0-52-powerpc-e500 3.13.0-52.86
linux-image-3.13.0-52-powerpc-e500mc 3.13.0-52.86
linux-image-3.13.0-52-powerpc-smp 3.13.0-52.86
linux-image-3.13.0-52-powerpc64-emb 3.13.0-52.86
linux-image-3.13.0-52-powerpc64-smp 3.13.0-52.86

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-2598-2
http://www.ubuntu.com/usn/usn-2598-1
https://launchpad.net/bugs/1450442

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.13.0-52.86