USN-3167-1: Linux kernel vulnerabilities

11 January 2017

Several security issues were fixed in the kernel.

Releases

Packages

  • linux - Linux kernel

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