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USN-2752-1: Linux kernel vulnerabilities

29 September 2015

Several security issues were fixed in the kernel.

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Details

Benjamin Randazzo discovered an information leak in the md (multiple
device) driver when the bitmap_info.file is disabled. A local privileged
attacker could use this to obtain sensitive information from the kernel.
(CVE-2015-5697)

Marc-André Lureau discovered that the vhost driver did not properly
release the userspace provided log file descriptor. A privileged attacker
could use this to cause a denial of service (resource exhaustion).
(CVE-2015-6252)

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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 15.04

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-2777-1: linux-image-3.16.0-51-generic, linux-image-3.16.0-51-generic-lpae, linux-image-3.16.0-51-powerpc64-smp, linux-image-3.16.0-51-powerpc-smp, linux-image-3.16.0-51-lowlatency, linux-image-3.16.0-51-powerpc64-emb, linux-image-extra-3.16.0-51-generic, linux-lts-utopic, linux-image-3.16.0-51-powerpc-e500mc
  • USN-2732-1: linux-ti-omap4, linux-image-3.2.0-1470-omap4
  • USN-2748-1: linux, linux-image-3.13.0-65-powerpc64-emb, linux-image-3.13.0-65-generic-lpae, linux-image-extra-3.13.0-65-generic, linux-image-3.13.0-65-powerpc-e500mc, linux-image-3.13.0-65-generic, linux-image-3.13.0-65-lowlatency, linux-image-3.13.0-65-powerpc64-smp, linux-image-3.13.0-65-powerpc-e500, linux-image-3.13.0-65-powerpc-smp
  • USN-2751-1: linux-image-3.19.0-30-generic, linux-image-3.19.0-30-powerpc64-smp, linux-image-3.19.0-30-powerpc64-emb, linux-image-3.19.0-30-powerpc-smp, linux-image-3.19.0-30-generic-lpae, linux-image-3.19.0-30-lowlatency, linux-image-extra-3.19.0-30-generic, linux-lts-vivid, linux-image-3.19.0-30-powerpc-e500mc
  • USN-2749-1: linux-image-3.13.0-65-generic, linux-lts-trusty, linux-image-3.13.0-65-generic-lpae
  • USN-2731-1: linux-image-3.2.0-90-powerpc64-smp, linux, linux-image-3.2.0-90-generic-pae, linux-image-3.2.0-90-generic, linux-image-3.2.0-90-omap, linux-image-3.2.0-90-virtual, linux-image-3.2.0-90-powerpc-smp, linux-image-3.2.0-90-highbank
  • USN-2759-1: linux, linux-image-3.2.0-91-virtual, linux-image-3.2.0-91-powerpc-smp, linux-image-3.2.0-91-powerpc64-smp, linux-image-3.2.0-91-generic, linux-image-3.2.0-91-highbank, linux-image-3.2.0-91-generic-pae, linux-image-3.2.0-91-omap
  • USN-2760-1: linux-ti-omap4, linux-image-3.2.0-1471-omap4

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