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USN-1389-1: Linux kernel vulnerabilities

6 March 2012

Several security issues were fixed in the kernel.

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Releases

Packages

Details

Paolo Bonzini discovered a flaw in Linux's handling of the SG_IO ioctl
command. A local user, or user in a VM could exploit this flaw to bypass
restrictions and gain read/write access to all data on the affected block
device. (CVE-2011-4127)

A flaw was found in KVM's Programmable Interval Timer (PIT). When a virtual
interrupt control is not available a local user could use this to cause a
denial of service by starting a timer. (CVE-2011-4622)

A flaw was discovered in the XFS filesystem. If a local user mounts a
specially crafted XFS image it could potential execute arbitrary code on
the system. (CVE-2012-0038)

A flaw was found in the Linux kernel's ext4 file system when mounting a
corrupt filesystem. A user-assisted remote attacker could exploit this flaw
to cause a denial of service. (CVE-2012-2100)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 10.04

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-1405-1: linux-image-3.0.0-16-server, linux, linux-image-3.0.0-16-generic, linux-image-3.0.0-16-powerpc-smp, linux-image-3.0.0-16-powerpc, linux-image-3.0.0-16-omap, linux-image-3.0.0-16-virtual, linux-image-3.0.0-16-powerpc64-smp, linux-image-3.0.0-16-generic-pae
  • USN-1388-1: linux-ec2, linux-image-2.6.32-343-ec2
  • USN-1384-1: linux-image-3.0.0-16-server, linux-image-3.0.0-16-generic, linux-lts-backport-oneiric, linux-image-3.0.0-16-virtual, linux-image-3.0.0-16-generic-pae
  • USN-1362-1: linux-image-2.6.38-13-generic, linux-image-2.6.38-13-powerpc64-smp, linux-image-2.6.38-13-omap, linux, linux-image-2.6.38-13-powerpc, linux-image-2.6.38-13-generic-pae, linux-image-2.6.38-13-versatile, linux-image-2.6.38-13-server, linux-image-2.6.38-13-virtual, linux-image-2.6.38-13-powerpc-smp
  • USN-1387-1: linux-image-2.6.35-32-generic-pae, linux-image-2.6.35-32-generic, linux-lts-backport-maverick, linux-image-2.6.35-32-virtual, linux-image-2.6.35-32-server
  • USN-1363-1: linux-image-3.0.0-16-server, linux, linux-image-3.0.0-16-generic, linux-image-3.0.0-16-powerpc-smp, linux-image-3.0.0-16-powerpc, linux-image-3.0.0-16-omap, linux-image-3.0.0-16-virtual, linux-image-3.0.0-16-powerpc64-smp, linux-image-3.0.0-16-generic-pae
  • USN-1361-1: linux-image-2.6.35-32-generic-pae, linux, linux-image-2.6.35-32-powerpc-smp, linux-image-2.6.35-32-generic, linux-image-2.6.35-32-versatile, linux-image-2.6.35-32-powerpc64-smp, linux-image-2.6.35-32-virtual, linux-image-2.6.35-32-omap, linux-image-2.6.35-32-powerpc, linux-image-2.6.35-32-server
  • USN-1386-1: linux-image-2.6.38-13-generic, linux-image-2.6.38-13-generic-pae, linux-lts-backport-natty, linux-image-2.6.38-13-server, linux-image-2.6.38-13-virtual
  • USN-1364-1: linux-image-3.0.0-1207-omap4, linux-ti-omap4
  • USN-1356-1: linux-image-2.6.38-1209-omap4, linux-ti-omap4
  • USN-1391-1: linux-image-2.6.32-423-dove, linux-mvl-dove
  • USN-1394-1: linux-ti-omap4, linux-image-2.6.35-903-omap4
  • USN-1440-1: linux-image-2.6.38-15-virtual, linux-image-2.6.38-15-server, linux-image-2.6.38-15-generic, linux-image-2.6.38-15-generic-pae, linux-lts-backport-natty
  • USN-1432-1: linux-image-2.6.38-15-virtual, linux, linux-image-2.6.38-15-server, linux-image-2.6.38-15-powerpc-smp, linux-image-2.6.38-15-generic, linux-image-2.6.38-15-generic-pae, linux-image-2.6.38-15-versatile, linux-image-2.6.38-15-omap, linux-image-2.6.38-15-powerpc, linux-image-2.6.38-15-powerpc64-smp
  • USN-1404-1: linux-ti-omap4, linux-image-3.0.0-1208-omap4
  • USN-1458-1: linux-image-2.6.38-1209-omap4, linux-ti-omap4