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USN-2588-1: Linux kernel vulnerabilities

30 April 2015

Several security issues were fixed in the kernel.




A stack overflow was discovered in the the microcode loader for the intel
x86 platform. A local attacker could exploit this flaw to cause a denial of
service (kernel crash) or to potentially execute code with kernel
privileges. (CVE-2015-2666)

It was discovered that the Linux kernel's IPv6 networking stack has a flaw
that allows using route advertisement (RA) messages to set the 'hop_limit'
to values that are too low. An unprivileged attacker on a local network
could exploit this flaw to cause a denial of service (IPv6 messages
dropped). (CVE-2015-2922)

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. 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-2587-1: linux-image-3.13.0-51-generic-lpae, linux-lts-trusty, linux-image-3.13.0-51-generic
  • USN-2590-1: linux-image-3.16.0-36-powerpc64-emb, linux-image-3.16.0-36-generic, linux-image-3.16.0-36-powerpc-e500mc, linux-image-3.16.0-36-generic-lpae, linux-image-3.16.0-36-powerpc64-smp, linux-image-3.16.0-36-lowlatency, linux-image-3.16.0-36-powerpc-smp, linux
  • USN-2589-1: linux-image-3.16.0-36-powerpc64-emb, linux-image-3.16.0-36-generic, linux-image-3.16.0-36-powerpc-e500mc, linux-image-3.16.0-36-generic-lpae, linux-image-extra-3.16.0-36-generic, linux-lts-utopic, linux-image-3.16.0-36-powerpc64-smp, linux-image-3.16.0-36-lowlatency, linux-image-3.16.0-36-powerpc-smp
  • USN-2586-1: linux-ti-omap4, linux-image-3.2.0-1463-omap4
  • USN-2585-1: linux-image-3.2.0-82-virtual, linux-image-3.2.0-82-omap, linux-image-3.2.0-82-highbank, linux-image-3.2.0-82-powerpc64-smp, linux-image-3.2.0-82-generic, linux-image-3.2.0-82-powerpc-smp, linux-image-3.2.0-82-generic-pae, linux