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USN-2463-1: Linux kernel vulnerabilities

13 January 2015

Several security issues were fixed in the kernel.

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A race condition with MMIO and PIO transactions in the KVM (Kernel Virtual
Machine) subsystem of the Linux kernel was discovered. A guest OS user
could exploit this flaw to cause a denial of service (guest OS crash) via a
specially crafted application. (CVE-2014-7842)

The KVM (kernel virtual machine) subsystem of the Linux kernel
miscalculates the number of memory pages during the handling of a mapping
failure. A guest OS user could exploit this to cause a denial of service
(host OS page unpinning) or possibly have unspecified other impact by
leveraging guest OS privileges. (CVE-2014-8369)

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. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

Related notices

  • USN-2468-1: linux-image-3.16.0-29-powerpc-e500mc, linux, linux-image-3.16.0-29-powerpc64-emb, linux-image-3.16.0-29-lowlatency, linux-image-3.16.0-29-powerpc-smp, linux-image-3.16.0-29-generic-lpae, linux-image-3.16.0-29-generic, linux-image-3.16.0-29-powerpc64-smp
  • USN-2467-1: linux-image-3.16.0-29-powerpc-e500mc, linux-image-3.16.0-29-powerpc64-emb, linux-image-extra-3.16.0-29-generic, linux-lts-utopic, linux-image-3.16.0-29-powerpc-smp, linux-image-3.16.0-29-lowlatency, linux-image-3.16.0-29-generic-lpae, linux-image-3.16.0-29-generic, linux-image-3.16.0-29-powerpc64-smp
  • USN-2465-1: linux-lts-trusty, linux-image-3.13.0-44-generic-lpae, linux-image-3.13.0-44-generic
  • USN-2464-1: linux-ti-omap4, linux-image-3.2.0-1458-omap4
  • USN-2466-1: linux-image-3.13.0-44-generic-lpae, linux, linux-image-3.13.0-44-powerpc-e500, linux-image-3.13.0-44-powerpc64-smp, linux-image-3.13.0-44-powerpc64-emb, linux-image-extra-3.13.0-44-generic, linux-image-3.13.0-44-lowlatency, linux-image-3.13.0-44-generic, linux-image-3.13.0-44-powerpc-smp, linux-image-3.13.0-44-powerpc-e500mc
  • USN-2445-1: linux-image-3.13.0-43-generic, linux-lts-trusty, linux-image-3.13.0-43-generic-lpae
  • USN-2447-1: linux-image-3.16.0-28-lowlatency, linux-image-3.16.0-28-generic-lpae, linux-lts-utopic, linux-image-3.16.0-28-powerpc-smp, linux-image-3.16.0-28-powerpc64-smp, linux-image-3.16.0-28-powerpc64-emb, linux-image-extra-3.16.0-28-generic, linux-image-3.16.0-28-generic, linux-image-3.16.0-28-powerpc-e500mc
  • USN-2448-1: linux-image-3.16.0-28-lowlatency, linux, linux-image-3.16.0-28-generic-lpae, linux-image-3.16.0-28-powerpc-smp, linux-image-3.16.0-28-powerpc64-smp, linux-image-3.16.0-28-powerpc64-emb, linux-image-3.16.0-28-generic, linux-image-3.16.0-28-powerpc-e500mc
  • USN-2446-1: linux-image-extra-3.13.0-43-generic, linux-image-3.13.0-43-powerpc-smp, linux-image-3.13.0-43-powerpc64-emb, linux-image-3.13.0-43-lowlatency, linux, linux-image-3.13.0-43-powerpc-e500, linux-image-3.13.0-43-generic, linux-image-3.13.0-43-powerpc64-smp, linux-image-3.13.0-43-generic-lpae, linux-image-3.13.0-43-powerpc-e500mc