USN-3052-1: Linux kernel vulnerabilities

10 August 2016

Several security issues were fixed in the kernel.



  • linux - Linux kernel


It was discovered that the keyring implementation in the Linux kernel did
not ensure a data structure was initialized before referencing it after an
error condition occurred. A local attacker could use this to cause a denial
of service (system crash). (CVE-2016-4470)

Kangjie Lu discovered an information leak in the netlink implementation of
the Linux kernel. A local attacker could use this to obtain sensitive
information from kernel memory. (CVE-2016-5243)

Update instructions

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

Ubuntu 14.04

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-3055-1: linux-image-4.4.0-34-powerpc64-smp, linux-image-4.4.0-34-lowlatency, linux-image-4.4.0-34-generic, linux-image-4.4.0-34-powerpc-e500mc, linux-image-4.4.0-34-powerpc-smp, linux-image-4.4.0-34-powerpc64-emb, linux, linux-image-4.4.0-34-generic-lpae
  • USN-3053-1: linux-image-3.19.0-66-lowlatency, linux-image-3.19.0-66-powerpc-e500mc, linux-image-3.19.0-66-powerpc64-smp, linux-image-3.19.0-66-powerpc-smp, linux-image-3.19.0-66-generic, linux-image-3.19.0-66-generic-lpae, linux-image-3.19.0-66-powerpc64-emb, linux-lts-vivid
  • USN-3056-1: linux-image-4.4.0-1019-raspi2, linux-raspi2
  • USN-3049-1: linux-image-3.2.0-107-highbank, linux-image-3.2.0-107-virtual, linux-image-3.2.0-107-generic, linux-image-3.2.0-107-generic-pae, linux-image-3.2.0-107-powerpc-smp, linux-image-3.2.0-107-omap, linux, linux-image-3.2.0-107-powerpc64-smp
  • USN-3054-1: linux-image-4.4.0-34-powerpc64-smp, linux-image-4.4.0-34-lowlatency, linux-image-4.4.0-34-generic, linux-lts-xenial, linux-image-4.4.0-34-powerpc-e500mc, linux-image-4.4.0-34-powerpc-smp, linux-image-4.4.0-34-powerpc64-emb, linux-image-4.4.0-34-generic-lpae
  • USN-3051-1: linux-image-3.13.0-93-generic, linux-image-3.13.0-93-generic-lpae, linux-lts-trusty
  • USN-3050-1: linux-ti-omap4, linux-image-3.2.0-1485-omap4
  • USN-3057-1: linux-image-4.4.0-1022-snapdragon, linux-snapdragon