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Ubuntu Security Notice USN-3099-1
October 11, 2016

linux vulnerabilities
===========================================================================

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

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Vladim=C3=ADr Bene=C5=A1 discovered an unbounded recursion in the VLAN and TEB
Generic Receive Offload (GRO) processing implementations in the Linux
kernel, A remote attacker could use this to cause a stack corruption,
leading to a denial of service (system crash). (CVE-2016-7039)

Marco Grassi discovered a use-after-free condition could occur in the TCP
retransmit queue handling code in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2016-6828)

Pengfei Wang discovered a race condition in the s390 SCLP console driver
for the Linux kernel when handling ioctl()s. A local attacker could use
this to obtain sensitive information from kernel memory. (CVE-2016-6130)

Pengfei Wang discovered a race condition in the Adaptec AAC RAID controller
driver in the Linux kernel when handling ioctl()s. A local attacker could
use this to cause a denial of service (system crash). (CVE-2016-6480)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-42-generic    4.4.0-42.62
  linux-image-4.4.0-42-generic-lpae  4.4.0-42.62
  linux-image-4.4.0-42-lowlatency  4.4.0-42.62
  linux-image-4.4.0-42-powerpc-e500mc  4.4.0-42.62
  linux-image-4.4.0-42-powerpc-smp  4.4.0-42.62
  linux-image-4.4.0-42-powerpc64-emb  4.4.0-42.62
  linux-image-4.4.0-42-powerpc64-smp  4.4.0-42.62

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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
  http://www.ubuntu.com/usn/usn-3099-1
  CVE-2016-6130, CVE-2016-6480, CVE-2016-6828, CVE-2016-7039

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-42.62