USN-2017-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-2017-1

8th November, 2013

linux vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 12.04 LTS

Summary

Several security issues were fixed in the kernel.

Software description

  • linux - Linux kernel

Details

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.
(CVE-2012-5374)

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.
(CVE-2013-2147)

Update instructions

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-56-generic-pae 3.2.0-56.86
linux-image-3.2.0-56-omap 3.2.0-56.86
linux-image-3.2.0-56-powerpc-smp 3.2.0-56.86
linux-image-3.2.0-56-powerpc64-smp 3.2.0-56.86
linux-image-3.2.0-56-generic 3.2.0-56.86
linux-image-3.2.0-56-highbank 3.2.0-56.86
linux-image-3.2.0-56-virtual 3.2.0-56.86

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

CVE-2012-5374, CVE-2012-5375, CVE-2013-2147