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USN-2779-1: Linux kernel vulnerabilities

20 October 2015

Several security issues were fixed in the kernel.




It was discovered that the Linux kernel did not check if a new IPv6 MTU set
by a user space application was valid. A remote attacker could forge a
route advertisement with an invalid MTU that a user space daemon like
NetworkManager would honor and apply to the kernel, causing a denial of
service. (CVE-2015-0272)

It was discovered that virtio networking in the Linux kernel did not handle
fragments correctly, leading to kernel memory corruption. A remote attacker
could use this to cause a denial of service (system crash) or possibly
execute code with administrative privileges. (CVE-2015-5156)

It was discovered that the Reliable Datagram Sockets (RDS) implementation
in the Linux kernel did not verify sockets were properly bound before
attempting to send a message, which could cause a NULL pointer dereference.
An attacker could use this to cause a denial of service (system crash).

Ben Hutchings discovered that the Advanced Union Filesystem (aufs) for the
Linux kernel did not correctly handle references of memory mapped files
from an aufs mount. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code with
administrative privileges. (CVE-2015-7312)

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.

Related notices

  • USN-2776-1: linux-image-3.13.0-66-powerpc64-smp, linux-image-3.13.0-66-powerpc-e500mc, linux-image-3.13.0-66-powerpc-smp, linux-image-3.13.0-66-powerpc64-emb, linux-image-3.13.0-66-generic-lpae, linux, linux-image-3.13.0-66-generic, linux-image-extra-3.13.0-66-generic, linux-image-3.13.0-66-powerpc-e500, linux-image-3.13.0-66-lowlatency
  • USN-2797-1: linux-image-3.16.0-52-powerpc-smp, linux-image-3.16.0-52-generic, linux-image-3.16.0-52-powerpc64-emb, linux-image-3.16.0-52-powerpc64-smp, linux-image-3.16.0-52-lowlatency, linux-image-3.16.0-52-generic-lpae, linux-lts-utopic, linux-image-extra-3.16.0-52-generic, linux-image-3.16.0-52-powerpc-e500mc
  • USN-2796-1: linux-ti-omap4, linux-image-3.2.0-1473-omap4
  • USN-2778-1: linux-image-3.19.0-31-powerpc64-smp, linux-image-extra-3.19.0-31-generic, linux-image-3.19.0-31-generic, linux-image-3.19.0-31-lowlatency, linux-image-3.19.0-31-powerpc-smp, linux-image-3.19.0-31-powerpc-e500mc, linux-image-3.19.0-31-powerpc64-emb, linux-lts-vivid, linux-image-3.19.0-31-generic-lpae
  • USN-2775-1: linux-image-3.13.0-66-generic, linux-image-3.13.0-66-generic-lpae, linux-lts-trusty
  • USN-2792-1: linux-image-3.2.0-93-highbank, linux-image-3.2.0-93-generic, linux-image-3.2.0-93-powerpc-smp, linux-image-3.2.0-93-powerpc64-smp, linux-image-3.2.0-93-generic-pae, linux, linux-image-3.2.0-93-omap, linux-image-3.2.0-93-virtual
  • USN-2777-1: linux-image-3.16.0-51-powerpc64-emb, linux-image-extra-3.16.0-51-generic, linux-image-3.16.0-51-generic-lpae, linux-image-3.16.0-51-generic, linux-image-3.16.0-51-lowlatency, linux-image-3.16.0-51-powerpc-e500mc, linux-lts-utopic, linux-image-3.16.0-51-powerpc-smp, linux-image-3.16.0-51-powerpc64-smp
  • USN-2773-1: linux-image-3.2.0-92-powerpc-smp, linux-image-3.2.0-92-powerpc64-smp, linux-image-3.2.0-92-generic, linux-image-3.2.0-92-highbank, linux-image-3.2.0-92-virtual, linux, linux-image-3.2.0-92-generic-pae, linux-image-3.2.0-92-omap
  • USN-2774-1: linux-ti-omap4, linux-image-3.2.0-1472-omap4