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USN-3160-1: Linux kernel vulnerabilities

20 December 2016

Several security issues were fixed in the kernel.

Releases

Packages

Details

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)

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