1. Ubuntu Security Notices
  2. USN-1311-1

USN-1311-1: Linux kernel vulnerabilities

Publication date

19 December 2011

Overview

Several security issues were fixed in the kernel.

Releases

Packages

Details

Peter Huewe discovered an information leak in the handling of reading
security-related TPM data. A local, unprivileged user could read the
results of a previous TPM command. (CVE-2011-1162)

Zheng Liu discovered a flaw in how the ext4 filesystem splits extents. A
local unprivileged attacker could exploit this to crash the system, leading
to a denial of service. (CVE-2011-3638)

A bug was discovered in the XFS filesystem's handling of pathnames. A local
attacker could exploit this to crash the system, leading to a denial of
service, or gain root privileges. (CVE-2011-4077)

Nick Bowler discovered the kernel GHASH message digest algorithm
incorrectly handled error conditions. A local attacker could exploit this
to cause a kernel oops. (CVE-2011-4081)

A flaw was found in the...

Peter Huewe discovered an information leak in the handling of reading
security-related TPM data. A local, unprivileged user could read the
results of a previous TPM command. (CVE-2011-1162)

Zheng Liu discovered a flaw in how the ext4 filesystem splits extents. A
local unprivileged attacker could exploit this to crash the system, leading
to a denial of service. (CVE-2011-3638)

A bug was discovered in the XFS filesystem's handling of pathnames. A local
attacker could exploit this to crash the system, leading to a denial of
service, or gain root privileges. (CVE-2011-4077)

Nick Bowler discovered the kernel GHASH message digest algorithm
incorrectly handled error conditions. A local attacker could exploit this
to cause a kernel oops. (CVE-2011-4081)

A flaw was found in the Journaling Block Device (JBD). A local attacker
able to mount ext3 or ext4 file systems could exploit this to crash the
system, leading to a denial of service. (CVE-2011-4132)

A bug was found in the way headroom check was performed in
udp6_ufo_fragment() function. A remote attacker could use this flaw to
crash the system. (CVE-2011-4326)

Clement Lecigne discovered a bug in the HFS file system bounds checking.
When a malformed HFS file system is mounted a local user could crash the
system or gain root privileges. (CVE-2011-4330)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
10.04 lucid linux-image-2.6.32-37-386 –  2.6.32-37.81
linux-image-2.6.32-37-powerpc –  2.6.32-37.81
linux-image-2.6.32-37-powerpc64-smp –  2.6.32-37.81
linux-image-2.6.32-37-generic-pae –  2.6.32-37.81
linux-image-2.6.32-37-sparc64 –  2.6.32-37.81
linux-image-2.6.32-37-generic –  2.6.32-37.81
linux-image-2.6.32-37-virtual –  2.6.32-37.81
linux-image-2.6.32-37-server –  2.6.32-37.81
linux-image-2.6.32-37-ia64 –  2.6.32-37.81
linux-image-2.6.32-37-sparc64-smp –  2.6.32-37.81
linux-image-2.6.32-37-preempt –  2.6.32-37.81
linux-image-2.6.32-37-powerpc-smp –  2.6.32-37.81
linux-image-2.6.32-37-lpia –  2.6.32-37.81
linux-image-2.6.32-37-versatile –  2.6.32-37.81

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References

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