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USN-2871-2: Linux kernel (Vivid HWE) vulnerability

19 January 2016

The system could be made to crash or run programs as an administrator.

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Releases

Packages

Details

Yevgeny Pats discovered that the session keyring implementation in the
Linux kernel did not properly reference count when joining an existing
session keyring. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code with
administrative privileges.

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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 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.

References

Related notices

  • USN-2872-2: linux-image-4.2.0-25-generic, linux-image-4.2.0-25-powerpc-e500mc, linux-image-4.2.0-25-generic-lpae, linux-image-4.2.0-25-powerpc64-emb, linux-image-extra-4.2.0-25-generic, linux-lts-wily, linux-image-4.2.0-25-powerpc64-smp, linux-image-4.2.0-25-powerpc-smp, linux-image-4.2.0-25-lowlatency
  • USN-2870-1: linux-image-3.13.0-76-generic, linux-image-3.13.0-76-powerpc-e500mc, linux-image-extra-3.13.0-76-generic, linux-image-3.13.0-76-powerpc-smp, linux-image-3.13.0-76-powerpc64-smp, linux-image-3.13.0-76-generic-lpae, linux-image-3.13.0-76-lowlatency, linux-image-3.13.0-76-powerpc64-emb, linux-image-3.13.0-76-powerpc-e500, linux
  • USN-2870-2: linux-image-3.13.0-76-generic, linux-lts-trusty, linux-image-3.13.0-76-generic-lpae
  • USN-2873-1: linux-image-3.16.0-59-powerpc-e500mc, linux-lts-utopic, linux-image-3.16.0-59-powerpc-smp, linux-image-3.16.0-59-generic, linux-image-3.16.0-59-generic-lpae, linux-image-3.16.0-59-powerpc64-smp, linux-image-3.16.0-59-powerpc64-emb, linux-image-3.16.0-59-lowlatency, linux-image-extra-3.16.0-59-generic
  • USN-2871-1: linux-image-3.19.0-47-generic, linux-image-3.19.0-47-powerpc-smp, linux-image-3.19.0-47-generic-lpae, linux-image-3.19.0-47-lowlatency, linux-image-3.19.0-47-powerpc64-emb, linux, linux-image-3.19.0-47-powerpc64-smp, linux-image-3.19.0-47-powerpc-e500mc
  • USN-2872-1: linux-image-4.2.0-25-generic, linux-image-4.2.0-25-powerpc-e500mc, linux-image-4.2.0-25-generic-lpae, linux-image-4.2.0-25-powerpc64-emb, linux-image-4.2.0-25-powerpc64-smp, linux-image-4.2.0-25-powerpc-smp, linux, linux-image-4.2.0-25-lowlatency
  • USN-2872-3: linux-raspi2, linux-image-4.2.0-1020-raspi2

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