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USN-1972-1: Linux kernel vulnerabilities

27 September 2013

Several security issues were fixed in the kernel.




Vince Weaver discovered a flaw in the perf subsystem of the Linux kernel on
ARM platforms. A local user could exploit this flaw to gain privileges or
cause a denial of service (system crash). (CVE-2013-4254)

A failure to validate block numbers was discovered in the Linux kernel's
implementation of the XFS filesystem. A local user can cause a denial of
service (system crash) if they can mount, or cause to be mounted a
corrupted or special crafted XFS filesystem. (CVE-2013-1819)

An information leak was discovered in the Linux kernel when reading
broadcast messages from the notify_policy interface of the IPSec
key_socket. A local user could exploit this flaw to examine potentially
sensitive information in kernel memory.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 12.10

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-1968-1: linux-image-3.2.0-54-powerpc-smp, linux-image-3.2.0-54-highbank, linux-image-3.2.0-54-generic, linux-image-3.2.0-54-omap, linux-image-3.2.0-54-powerpc64-smp, linux-image-3.2.0-54-virtual, linux, linux-image-3.2.0-54-generic-pae
  • USN-1969-1: linux-image-3.2.0-1438-omap4, linux-ti-omap4
  • USN-1973-1: linux-ti-omap4, linux-image-3.5.0-233-omap4
  • USN-1970-1: linux-lts-quantal, linux-image-3.5.0-41-generic
  • USN-1975-1: linux-ti-omap4, linux-image-3.5.0-233-omap4
  • USN-1912-1: linux-image-2.6.32-50-virtual, linux-image-2.6.32-50-386, linux-image-2.6.32-50-powerpc-smp, linux-image-2.6.32-50-powerpc, linux-image-2.6.32-50-powerpc64-smp, linux-image-2.6.32-50-generic, linux-image-2.6.32-50-sparc64-smp, linux-image-2.6.32-50-versatile, linux-image-2.6.32-50-ia64, linux-image-2.6.32-50-generic-pae, linux-image-2.6.32-50-server, linux-image-2.6.32-50-sparc64, linux-image-2.6.32-50-preempt, linux, linux-image-2.6.32-50-lpia
  • USN-1992-1: linux-image-3.2.0-55-generic, linux-image-3.2.0-55-powerpc-smp, linux-image-3.2.0-55-powerpc64-smp, linux-image-3.2.0-55-virtual, linux-image-3.2.0-55-highbank, linux-image-3.2.0-55-generic-pae, linux, linux-image-3.2.0-55-omap
  • USN-1913-1: linux-ec2, linux-image-2.6.32-355-ec2
  • USN-1993-1: linux-image-3.2.0-1439-omap4, linux-ti-omap4
  • USN-1998-1: linux-image-3.8.0-32-generic, linux
  • USN-1995-1: linux-image-3.8.0-32-generic, linux-lts-raring
  • USN-1974-1: linux-image-3.8.0-31-generic, linux
  • USN-1971-1: linux-image-3.8.0-31-generic, linux-lts-raring