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USN-2017-1: Linux kernel vulnerabilities

8 November 2013

Several security issues were fixed in the kernel.




A denial of service flaw was discovered in the Btrfs file system in the
Linux kernel. A local user could cause a denial of service by creating a
large number of files with names that have the same CRC32 hash value.

A denial of service flaw was discovered in the Btrfs file system in the
Linux kernel. A local user could cause a denial of service (prevent file
creation) for a victim, by creating a file with a specific CRC32C hash
value in a directory important to the victim. (CVE-2012-5375)

Dan Carpenter discovered an information leak in the HP Smart Array and
Compaq SMART2 disk-array driver in the Linux kernel. A local user could
exploit this flaw to obtain sensitive information from kernel memory.

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.

Related notices

  • USN-1947-1: linux-lts-quantal, linux-image-3.5.0-40-generic
  • USN-1946-1: linux-ti-omap4, linux-image-3.5.0-232-omap4
  • USN-2018-1: linux-ti-omap4, linux-image-3.2.0-1440-omap4
  • USN-1944-1: linux-image-3.5.0-40-omap, linux, linux-image-3.5.0-40-highbank, linux-image-3.5.0-40-generic, linux-image-3.5.0-40-powerpc64-smp, linux-image-3.5.0-40-powerpc-smp
  • USN-1945-1: linux-ti-omap4, linux-image-3.5.0-232-omap4
  • USN-2023-1: linux, linux-image-3.8.0-33-generic
  • USN-2020-1: linux-image-3.8.0-33-generic, linux-lts-raring
  • USN-1999-1: linux-image-3.5.0-234-omap4, linux-ti-omap4
  • USN-1994-1: linux-lts-quantal, linux-image-3.5.0-42-generic
  • USN-1996-1: linux, linux-image-3.5.0-42-powerpc64-smp, linux-image-3.5.0-42-highbank, linux-image-3.5.0-42-omap, linux-image-3.5.0-42-powerpc-smp, linux-image-3.5.0-42-generic
  • USN-2016-1: linux-image-2.6.32-358-ec2, linux-ec2
  • USN-2015-1: linux-image-2.6.32-53-server, linux-image-2.6.32-53-sparc64, linux-image-2.6.32-53-generic-pae, linux, linux-image-2.6.32-53-preempt, linux-image-2.6.32-53-sparc64-smp, linux-image-2.6.32-53-generic, linux-image-2.6.32-53-lpia, linux-image-2.6.32-53-virtual, linux-image-2.6.32-53-powerpc-smp, linux-image-2.6.32-53-powerpc, linux-image-2.6.32-53-versatile, linux-image-2.6.32-53-ia64, linux-image-2.6.32-53-powerpc64-smp, linux-image-2.6.32-53-386
  • USN-2050-1: linux-ti-omap4, linux-image-3.5.0-236-omap4
  • USN-1997-1: linux-image-3.5.0-234-omap4, linux-ti-omap4