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USN-2979-1: Linux kernel vulnerabilities

16 May 2016

Several security issues were fixed in the kernel.

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Releases

Packages

Details

David Matlack discovered that the Kernel-based Virtual Machine (KVM)
implementation in the Linux kernel did not properly restrict variable
Memory Type Range Registers (MTRR) in KVM guests. A privileged user in a
guest VM could use this to cause a denial of service (system crash) in the
host, expose sensitive information from the host, or possibly gain
administrative privileges in the host. (CVE-2016-3713)

Philip Pettersson discovered that the Linux kernel's ASN.1 DER decoder did
not properly process certificate files with tags of indefinite length. A
local unprivileged attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code with administrative
privileges. (CVE-2016-0758)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 16.04

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-2975-1: linux-image-3.13.0-86-generic-lpae, linux-image-3.13.0-86-powerpc-smp, linux-image-3.13.0-86-generic, linux, linux-image-extra-3.13.0-86-generic, linux-image-3.13.0-86-powerpc64-smp, linux-image-3.13.0-86-powerpc-e500mc, linux-image-3.13.0-86-lowlatency, linux-image-3.13.0-86-powerpc-e500, linux-image-3.13.0-86-powerpc64-emb
  • USN-2978-2: linux-image-4.2.0-36-generic, linux-lts-wily, linux-image-4.2.0-36-powerpc-e500mc, linux-image-4.2.0-36-lowlatency, linux-image-4.2.0-36-powerpc64-emb, linux-image-4.2.0-36-powerpc64-smp, linux-image-extra-4.2.0-36-generic, linux-image-4.2.0-36-generic-lpae, linux-image-4.2.0-36-powerpc-smp
  • USN-2976-1: linux-image-3.16.0-71-generic-lpae, linux-image-extra-3.16.0-71-generic, linux-image-3.16.0-71-powerpc64-emb, linux-image-3.16.0-71-lowlatency, linux-image-3.16.0-71-generic, linux-image-3.16.0-71-powerpc-smp, linux-image-3.16.0-71-powerpc64-smp, linux-image-3.16.0-71-powerpc-e500mc, linux-lts-utopic
  • USN-2979-4: linux-image-4.4.0-1013-snapdragon, linux-snapdragon
  • USN-2977-1: linux-image-3.19.0-59-powerpc-e500mc, linux-image-3.19.0-59-powerpc-smp, linux-image-3.19.0-59-powerpc64-smp, linux-image-extra-3.19.0-59-generic, linux-image-3.19.0-59-generic, linux-lts-vivid, linux-image-3.19.0-59-lowlatency, linux-image-3.19.0-59-generic-lpae, linux-image-3.19.0-59-powerpc64-emb
  • USN-2978-3: linux-raspi2, linux-image-4.2.0-1029-raspi2
  • USN-2979-2: linux-image-4.4.0-22-generic-lpae, linux-image-4.4.0-22-powerpc64-emb, linux-image-4.4.0-22-generic, linux-image-4.4.0-22-powerpc-smp, linux-image-4.4.0-22-lowlatency, linux-lts-xenial, linux-image-4.4.0-22-powerpc-e500mc, linux-image-4.4.0-22-powerpc64-smp, linux-image-extra-4.4.0-22-generic
  • USN-2975-2: linux-image-3.13.0-86-generic, linux-image-3.13.0-86-generic-lpae, linux-lts-trusty
  • USN-2979-3: linux-raspi2, linux-image-4.4.0-1010-raspi2
  • USN-2978-1: linux-image-4.2.0-36-generic, linux, linux-image-4.2.0-36-powerpc-e500mc, linux-image-4.2.0-36-lowlatency, linux-image-4.2.0-36-powerpc64-emb, linux-image-4.2.0-36-powerpc64-smp, linux-image-4.2.0-36-generic-lpae, linux-image-4.2.0-36-powerpc-smp