[USN-3146-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3146-1
November 30, 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:

It was discovered that the __get_user_asm_ex implementation in the Linux
kernel for x86/x86_64 contained extended asm statements that were
incompatible with the exception table. A local attacker could use this to
gain administrative privileges. (CVE-2016-9644)

Andreas Gruenbacher and Jan Kara discovered that the filesystem
implementation in the Linux kernel did not clear the setgid bit during a
setxattr call. A local attacker could use this to possibly elevate group
privileges. (CVE-2016-7097)

Marco Grassi discovered that the driver for Areca RAID Controllers in the
Linux kernel did not properly validate control messages. A local attacker
could use this to cause a denial of service (system crash) or possibly gain
privileges. (CVE-2016-7425)

Daxing Guo discovered a stack-based buffer overflow in the Broadcom
IEEE802.11n FullMAC driver in the Linux kernel. A local attacker could use
this to cause a denial of service (system crash) or possibly gain
privileges. (CVE-2016-8658)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-51-generic    4.4.0-51.72
  linux-image-4.4.0-51-generic-lpae  4.4.0-51.72
  linux-image-4.4.0-51-lowlatency  4.4.0-51.72
  linux-image-4.4.0-51-powerpc-e500mc  4.4.0-51.72
  linux-image-4.4.0-51-powerpc-smp  4.4.0-51.72
  linux-image-4.4.0-51-powerpc64-emb  4.4.0-51.72
  linux-image-4.4.0-51-powerpc64-smp  4.4.0-51.72
  linux-image-generic             4.4.0.51.54
  linux-image-generic-lpae        4.4.0.51.54
  linux-image-lowlatency          4.4.0.51.54
  linux-image-powerpc-e500mc      4.4.0.51.54
  linux-image-powerpc-smp         4.4.0.51.54
  linux-image-powerpc64-emb       4.4.0.51.54
  linux-image-powerpc64-smp       4.4.0.51.54

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-3146-1
  CVE-2016-7097, CVE-2016-7425, CVE-2016-8658, CVE-2016-9644

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-51.72

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