5 - USN-2564-1

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

- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description: - linux-lts-utopic: Linux hardware enablement kernel from Utopic

Details:

An integer overflow was discovered in the stack randomization feature of the Linux kernel on 64 bit platforms. A local attacker could exploit this flaw to bypass the Address Space Layout Randomization (ASLR) protection mechanism. (CVE-2015-1593)

An information leak was discovered in the Linux Kernel's handling of userspace configuration of the link layer control (LLC). A local user could exploit this flaw to read data from other sysctl settings. (CVE-2015-2041)

An information leak was discovered in how the Linux kernel handles setting the Reliable Datagram Sockets (RDS) settings. A local user could exploit this flaw to read data from other sysctl settings. (CVE-2015-2042)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-3.16.0-34-generic 3.16.0-34.45~14.04.1
linux-image-3.16.0-34-generic-lpae 3.16.0-34.45~14.04.1
linux-image-3.16.0-34-lowlatency 3.16.0-34.45~14.04.1
linux-image-3.16.0-34-powerpc-e500mc 3.16.0-34.45~14.04.1
linux-image-3.16.0-34-powerpc-smp 3.16.0-34.45~14.04.1
linux-image-3.16.0-34-powerpc64-emb 3.16.0-34.45~14.04.1
linux-image-3.16.0-34-powerpc64-smp 3.16.0-34.45~14.04.1

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

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well.

References:
http://www.ubuntu.com/usn/usn-2564-1
CVE-2015-1593, CVE-2015-2041, CVE-2015-2042

Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-34.45~14.04.1