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USN-2840-1: Linux kernel vulnerabilities

17 December 2015

Several security issues were fixed in the kernel.

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Releases

Packages

Details

Dmitry Vyukov discovered that the Linux kernel's keyring handler attempted
to garbage collect incompletely instantiated keys. A local unprivileged
attacker could use this to cause a denial of service (system crash).
(CVE-2015-7872)

Jan Beulich discovered that the KVM svm hypervisor implementation in the
Linux kernel did not properly catch Debug exceptions on AMD processors. An
attacker in a guest virtual machine could use this to cause a denial of
service (system crash) in the host OS. (CVE-2015-8104)

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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 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.

References

Related notices

  • USN-2823-1: linux-image-3.13.0-71-lowlatency, linux-image-3.13.0-71-powerpc-smp, linux-image-3.13.0-71-generic-lpae, linux-image-extra-3.13.0-71-generic, linux-image-3.13.0-71-powerpc64-emb, linux-image-3.13.0-71-powerpc-e500mc, linux-image-3.13.0-71-powerpc-e500, linux, linux-image-3.13.0-71-powerpc64-smp, linux-image-3.13.0-71-generic
  • USN-2843-2: linux-image-4.2.0-21-powerpc64-emb, linux-image-4.2.0-21-powerpc-e500mc, linux-lts-wily, linux-image-extra-4.2.0-21-generic, linux-image-4.2.0-21-powerpc-smp, linux-image-4.2.0-21-generic-lpae, linux-image-4.2.0-21-powerpc64-smp, linux-image-4.2.0-21-lowlatency, linux-image-4.2.0-21-generic
  • USN-2824-1: linux-image-extra-3.16.0-55-generic, linux-image-3.16.0-55-powerpc-e500mc, linux-image-3.16.0-55-powerpc64-emb, linux-image-3.16.0-55-generic, linux-lts-utopic, linux-image-3.16.0-55-generic-lpae, linux-image-3.16.0-55-lowlatency, linux-image-3.16.0-55-powerpc-smp, linux-image-3.16.0-55-powerpc64-smp
  • USN-2840-2: linux-ti-omap4, linux-image-3.2.0-1475-omap4
  • USN-2829-1: linux-image-3.19.0-39-powerpc64-smp, linux-image-3.19.0-39-powerpc-smp, linux-image-3.19.0-39-generic-lpae, linux-image-3.19.0-39-lowlatency, linux, linux-image-3.19.0-39-generic, linux-image-3.19.0-39-powerpc64-emb, linux-image-3.19.0-39-powerpc-e500mc
  • USN-2826-1: linux-image-3.13.0-71-generic-lpae, linux-lts-trusty, linux-image-3.13.0-71-generic
  • USN-2829-2: linux-image-3.19.0-39-powerpc64-smp, linux-lts-vivid, linux-image-3.19.0-39-powerpc-smp, linux-image-3.19.0-39-generic-lpae, linux-image-3.19.0-39-lowlatency, linux-image-3.19.0-39-generic, linux-image-extra-3.19.0-39-generic, linux-image-3.19.0-39-powerpc64-emb, linux-image-3.19.0-39-powerpc-e500mc
  • USN-2843-1: linux-image-4.2.0-21-powerpc64-emb, linux-image-4.2.0-21-powerpc-e500mc, linux-image-4.2.0-21-powerpc-smp, linux-image-4.2.0-21-generic-lpae, linux, linux-image-4.2.0-21-powerpc64-smp, linux-image-4.2.0-21-lowlatency, linux-image-4.2.0-21-generic
  • USN-2843-3: linux-raspi2, linux-image-4.2.0-1016-raspi2
  • USN-2842-2: linux-lts-vivid, linux-image-3.19.0-41-powerpc64-smp, linux-image-extra-3.19.0-41-generic, linux-image-3.19.0-41-lowlatency, linux-image-3.19.0-41-powerpc-e500mc, linux-image-3.19.0-41-powerpc-smp, linux-image-3.19.0-41-generic-lpae, linux-image-3.19.0-41-powerpc64-emb, linux-image-3.19.0-41-generic
  • USN-2844-1: linux-image-3.16.0-56-powerpc-smp, linux-image-3.16.0-56-generic-lpae, linux-image-3.16.0-56-lowlatency, linux-image-3.16.0-56-powerpc-e500mc, linux-lts-utopic, linux-image-extra-3.16.0-56-generic, linux-image-3.16.0-56-powerpc64-emb, linux-image-3.16.0-56-powerpc64-smp, linux-image-3.16.0-56-generic
  • USN-2841-1: linux-image-3.13.0-73-generic-lpae, linux-image-3.13.0-73-powerpc-e500, linux-image-extra-3.13.0-73-generic, linux-image-3.13.0-73-generic, linux-image-3.13.0-73-powerpc-smp, linux-image-3.13.0-73-lowlatency, linux, linux-image-3.13.0-73-powerpc64-smp, linux-image-3.13.0-73-powerpc64-emb, linux-image-3.13.0-73-powerpc-e500mc
  • USN-2841-2: linux-image-3.13.0-73-generic, linux-lts-trusty, linux-image-3.13.0-73-generic-lpae
  • USN-2842-1: linux-image-3.19.0-41-powerpc64-smp, linux, linux-image-3.19.0-41-lowlatency, linux-image-3.19.0-41-powerpc-e500mc, linux-image-3.19.0-41-powerpc-smp, linux-image-3.19.0-41-generic-lpae, linux-image-3.19.0-41-powerpc64-emb, linux-image-3.19.0-41-generic

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