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USN-3160-2: Linux kernel (Trusty HWE) vulnerabilities

20 December 2016

Several security issues were fixed in the kernel.

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USN-3160-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu
12.04 LTS.

CAI Qian discovered that shared bind mounts in a mount namespace
exponentially added entries without restriction to the Linux kernel's mount
table. A local attacker could use this to cause a denial of service (system
crash). (CVE-2016-6213)

It was discovered that a race condition existed in the procfs
environ_read function in the Linux kernel, leading to an integer
underflow. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2016-7916)

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.

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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-3162-2: linux-image-4.8.0-1021-raspi2, linux-raspi2, linux-image-raspi2
  • USN-3162-1: linux-image-generic, linux-image-4.8.0-32-powerpc-smp, linux-image-lowlatency, linux-image-powerpc-e500mc, linux-image-generic-lpae, linux-image-powerpc-smp, linux-image-4.8.0-32-powerpc-e500mc, linux-image-4.8.0-32-generic-lpae, linux-image-4.8.0-32-lowlatency, linux-image-4.8.0-32-generic, linux-image-powerpc64-emb, linux-image-4.8.0-32-powerpc64-emb, linux
  • USN-3161-4: linux-image-4.4.0-1042-snapdragon, linux-snapdragon
  • USN-3161-1: linux-image-4.4.0-57-lowlatency, linux-image-4.4.0-57-powerpc-smp, linux-image-4.4.0-57-generic, linux-image-4.4.0-57-powerpc64-smp, linux-image-4.4.0-57-powerpc-e500mc, linux-image-4.4.0-57-powerpc64-emb, linux-image-extra-4.4.0-57-generic, linux-image-4.4.0-57-generic-lpae, linux
  • USN-3161-3: linux-raspi2, linux-image-4.4.0-1038-raspi2
  • USN-3161-2: linux-image-4.4.0-57-lowlatency, linux-image-4.4.0-57-powerpc-smp, linux-image-4.4.0-57-generic, linux-lts-xenial, linux-image-4.4.0-57-powerpc64-smp, linux-image-4.4.0-57-powerpc-e500mc, linux-image-4.4.0-57-powerpc64-emb, linux-image-extra-4.4.0-57-generic, linux-image-4.4.0-57-generic-lpae
  • USN-3160-1: linux-image-extra-3.13.0-106-generic, linux-image-3.13.0-106-generic-lpae, linux-image-3.13.0-106-powerpc-e500mc, linux-image-3.13.0-106-powerpc-e500, linux-image-3.13.0-106-powerpc64-emb, linux-image-3.13.0-106-powerpc64-smp, linux-image-3.13.0-106-generic, linux, linux-image-3.13.0-106-powerpc-smp, linux-image-3.13.0-106-lowlatency
  • USN-3159-2: linux-image-omap4, linux-ti-omap4, linux-image-3.2.0-1497-omap4
  • USN-3159-1: linux-image-generic, linux-image-highbank, linux-image-powerpc64-smp, linux-image-3.2.0-119-powerpc64-smp, linux-image-3.2.0-119-virtual, linux-image-3.2.0-119-omap, linux-image-3.2.0-119-highbank, linux-image-3.2.0-119-generic-pae, linux-image-powerpc-smp, linux-image-omap, linux-image-3.2.0-119-powerpc-smp, linux-image-generic-pae, linux-image-virtual, linux, linux-image-3.2.0-119-generic