USN-1311-1: Linux kernel vulnerabilities

19 December 2011

linux vulnerabilities

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

  • Ubuntu 10.04 LTS


Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel


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

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

Ubuntu 10.04 LTS
linux-image-2.6.32-37-386 - 2.6.32-37.81
linux-image-2.6.32-37-generic - 2.6.32-37.81
linux-image-2.6.32-37-generic-pae - 2.6.32-37.81
linux-image-2.6.32-37-ia64 - 2.6.32-37.81
linux-image-2.6.32-37-lpia - 2.6.32-37.81
linux-image-2.6.32-37-powerpc - 2.6.32-37.81
linux-image-2.6.32-37-powerpc-smp - 2.6.32-37.81
linux-image-2.6.32-37-powerpc64-smp - 2.6.32-37.81
linux-image-2.6.32-37-preempt - 2.6.32-37.81
linux-image-2.6.32-37-server - 2.6.32-37.81
linux-image-2.6.32-37-sparc64 - 2.6.32-37.81
linux-image-2.6.32-37-sparc64-smp - 2.6.32-37.81
linux-image-2.6.32-37-versatile - 2.6.32-37.81
linux-image-2.6.32-37-virtual - 2.6.32-37.81

To update your system, please follow these instructions:

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.