USN-3167-1: Linux kernel vulnerabilities

11 January 2017

Several security issues were fixed in the kernel.

Releases

Packages

Details

Dmitry Vyukov discovered that the KVM implementation in the Linux
kernel did not properly initialize the Code Segment (CS) in certain
error cases. A local attacker could use this to expose sensitive
information (kernel memory).

Baozeng Ding discovered a race condition that could lead to a use-after-
free in the Advanced Linux Sound Architecture (ALSA) subsystem of the Linux
kernel. A local attacker could use this to cause a denial of service
(system crash). (CVE-2016-9794)

Update instructions

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

Ubuntu 12.04

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.

Related notices

  • USN-3169-2: linux-lts-xenial, linux-image-4.4.0-59-powerpc-e500mc, linux-image-4.4.0-59-powerpc64-smp, linux-image-4.4.0-59-generic, linux-image-4.4.0-59-lowlatency, linux-image-extra-4.4.0-59-generic, linux-image-4.4.0-59-powerpc-smp, linux-image-4.4.0-59-powerpc64-emb, linux-image-4.4.0-59-generic-lpae
  • USN-3168-1: linux-image-extra-3.13.0-107-generic, linux-image-3.13.0-107-powerpc-e500, linux-image-3.13.0-107-powerpc64-emb, linux-image-3.13.0-107-lowlatency, linux-image-3.13.0-107-powerpc-e500mc, linux-image-3.13.0-107-powerpc-smp, linux-image-3.13.0-107-generic, linux-image-3.13.0-107-generic-lpae, linux, linux-image-3.13.0-107-powerpc64-smp
  • USN-3169-4: linux-image-4.4.0-1044-snapdragon, linux-snapdragon
  • USN-3167-2: linux-ti-omap4, linux-image-omap4, linux-image-3.2.0-1498-omap4
  • USN-3170-1: linux-image-generic-lpae, linux-image-4.8.0-34-generic-lpae, linux-image-lowlatency, linux-image-generic, linux-image-4.8.0-34-generic, linux-image-powerpc-e500mc, linux-image-4.8.0-34-lowlatency, linux-image-4.8.0-34-powerpc64-emb, linux-image-4.8.0-34-powerpc-smp, linux, linux-image-powerpc64-emb, linux-image-powerpc-smp, linux-image-4.8.0-34-powerpc-e500mc
  • USN-3169-1: linux-image-4.4.0-59-powerpc-e500mc, linux-image-4.4.0-59-powerpc64-smp, linux-image-4.4.0-59-generic, linux, linux-image-4.4.0-59-lowlatency, linux-image-extra-4.4.0-59-generic, linux-image-4.4.0-59-powerpc-smp, linux-image-4.4.0-59-powerpc64-emb, linux-image-4.4.0-59-generic-lpae
  • USN-3168-2: linux-lts-trusty, linux-image-generic-lts-trusty, linux-image-3.13.0-107-generic, linux-image-3.13.0-107-generic-lpae, linux-image-generic-lpae-lts-trusty
  • USN-3169-3: linux-image-4.4.0-1040-raspi2, linux-raspi2