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USN-3159-1: Linux kernel vulnerability

20 December 2016

The system could be made to expose sensitive information.

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Releases

Packages

Details

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).

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 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.

References

Related notices

  • USN-3160-2: linux-image-generic-lts-trusty, linux-lts-trusty, linux-image-3.13.0-106-generic, linux-image-3.13.0-106-generic-lpae, linux-image-generic-lpae-lts-trusty
  • USN-3159-2: linux-image-omap4, linux-ti-omap4, linux-image-3.2.0-1497-omap4
  • USN-3160-1: linux-image-3.13.0-106-powerpc64-smp, linux-image-3.13.0-106-powerpc64-emb, linux-image-3.13.0-106-powerpc-e500, linux-image-3.13.0-106-generic, linux-image-3.13.0-106-generic-lpae, linux-image-3.13.0-106-powerpc-smp, linux-image-3.13.0-106-lowlatency, linux, linux-image-extra-3.13.0-106-generic, linux-image-3.13.0-106-powerpc-e500mc

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Further reading