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USN-3159-2: Linux kernel (OMAP4) vulnerability

20 December 2016

The system could be made to expose sensitive information.




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).

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-3160-2: linux-image-3.13.0-106-generic-lpae, linux-image-3.13.0-106-generic, linux-lts-trusty, linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty
  • USN-3159-1: linux-image-3.2.0-119-generic-pae, linux-image-3.2.0-119-omap, linux-image-virtual, linux-image-3.2.0-119-generic, linux-image-powerpc-smp, linux-image-3.2.0-119-highbank, linux-image-3.2.0-119-powerpc-smp, linux-image-highbank, linux-image-generic, linux-image-3.2.0-119-virtual, linux-image-omap, linux-image-3.2.0-119-powerpc64-smp, linux, linux-image-powerpc64-smp, linux-image-generic-pae
  • USN-3160-1: linux-image-3.13.0-106-powerpc-e500, linux-image-extra-3.13.0-106-generic, linux-image-3.13.0-106-generic-lpae, linux-image-3.13.0-106-powerpc64-smp, linux-image-3.13.0-106-generic, linux-image-3.13.0-106-powerpc-smp, linux-image-3.13.0-106-powerpc-e500mc, linux-image-3.13.0-106-powerpc64-emb, linux-image-3.13.0-106-lowlatency, linux