============================================================================
Ubuntu Security Notice USN-2615-1
May 20, 2015

linux-lts-utopic vulnerabilities
============================================================================

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:

Alexandre Oliva reported a race condition flaw in the btrfs file system's
handling of extended attributes (xattrs). A local attacker could exploit
this flaw to bypass ACLs and potentially escalate privileges.
(CVE-2014-9710)

A memory corruption issue was discovered in AES decryption when using the
Intel AES-NI accelerated code path. A remote attacker could exploit this
flaw to cause a denial of service (system crash) or potentially escalate
privileges on Intel base machines with AEC-GCM mode IPSec security
association. (CVE-2015-3331)

A flaw was discovered in the Linux kernel's IPv4 networking when using TCP
fast open to initiate a connection. An unprivileged local user could
exploit this flaw to cause a denial of service (system crash).
(CVE-2015-3332)

Update instructions:

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

Ubuntu 14.04 LTS:
  linux-image-3.16.0-38-generic   3.16.0-38.52~14.04.1
  linux-image-3.16.0-38-generic-lpae  3.16.0-38.52~14.04.1
  linux-image-3.16.0-38-lowlatency  3.16.0-38.52~14.04.1
  linux-image-3.16.0-38-powerpc-e500mc  3.16.0-38.52~14.04.1
  linux-image-3.16.0-38-powerpc-smp  3.16.0-38.52~14.04.1
  linux-image-3.16.0-38-powerpc64-emb  3.16.0-38.52~14.04.1
  linux-image-3.16.0-38-powerpc64-smp  3.16.0-38.52~14.04.1

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-2615-1
  CVE-2014-9710, CVE-2015-3331, CVE-2015-3332

Package Information:
  https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-38.52~14.04.1