USN-1388-1: Linux kernel (EC2) vulnerabilities

06 March 2012

Several security issues were fixed in the kernel.

Releases

Packages

  • linux-ec2 - Linux kernel for EC2

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)

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-1391-1: linux-mvl-dove, linux-image-2.6.32-423-dove
  • USN-1389-1: linux-image-2.6.32-39-generic-pae, linux-image-2.6.32-39-powerpc, linux-image-2.6.32-39-powerpc64-smp, linux-image-2.6.32-39-386, linux-image-2.6.32-39-virtual, linux-image-2.6.32-39-sparc64, linux-image-2.6.32-39-preempt, linux-image-2.6.32-39-generic, linux-image-2.6.32-39-ia64, linux-image-2.6.32-39-versatile, linux, linux-image-2.6.32-39-lpia, linux-image-2.6.32-39-powerpc-smp, linux-image-2.6.32-39-server, linux-image-2.6.32-39-sparc64-smp
  • USN-1440-1: linux-image-2.6.38-15-generic-pae, linux-image-2.6.38-15-virtual, linux-image-2.6.38-15-generic, linux-lts-backport-natty, linux-image-2.6.38-15-server
  • USN-1404-1: linux-ti-omap4, linux-image-3.0.0-1208-omap4
  • USN-1387-1: linux-lts-backport-maverick, linux-image-2.6.35-32-server, linux-image-2.6.35-32-generic-pae, linux-image-2.6.35-32-generic, linux-image-2.6.35-32-virtual
  • USN-1394-1: linux-ti-omap4, linux-image-2.6.35-903-omap4
  • USN-1356-1: linux-ti-omap4, linux-image-2.6.38-1209-omap4
  • USN-1364-1: linux-image-3.0.0-1207-omap4, linux-ti-omap4
  • USN-1361-1: linux-image-2.6.35-32-server, linux-image-2.6.35-32-powerpc, linux-image-2.6.35-32-powerpc64-smp, linux-image-2.6.35-32-omap, linux-image-2.6.35-32-versatile, linux-image-2.6.35-32-generic-pae, linux-image-2.6.35-32-generic, linux, linux-image-2.6.35-32-powerpc-smp, linux-image-2.6.35-32-virtual
  • USN-1432-1: linux-image-2.6.38-15-omap, linux-image-2.6.38-15-generic-pae, linux-image-2.6.38-15-powerpc, linux-image-2.6.38-15-virtual, linux-image-2.6.38-15-generic, linux-image-2.6.38-15-powerpc64-smp, linux-image-2.6.38-15-versatile, linux, linux-image-2.6.38-15-powerpc-smp, linux-image-2.6.38-15-server
  • USN-1405-1: linux-image-3.0.0-16-server, linux-image-3.0.0-16-omap, linux-image-3.0.0-16-powerpc-smp, linux-image-3.0.0-16-powerpc, linux, linux-image-3.0.0-16-powerpc64-smp, linux-image-3.0.0-16-generic, linux-image-3.0.0-16-virtual, linux-image-3.0.0-16-generic-pae
  • USN-1458-1: linux-ti-omap4, linux-image-2.6.38-1209-omap4
  • USN-1384-1: linux-image-3.0.0-16-server, linux-lts-backport-oneiric, linux-image-3.0.0-16-generic, linux-image-3.0.0-16-virtual, linux-image-3.0.0-16-generic-pae
  • USN-1386-1: linux-image-2.6.38-13-server, linux-image-2.6.38-13-generic-pae, linux-image-2.6.38-13-generic, linux-lts-backport-natty, linux-image-2.6.38-13-virtual
  • USN-1362-1: linux-image-2.6.38-13-omap, linux-image-2.6.38-13-server, linux-image-2.6.38-13-versatile, linux-image-2.6.38-13-generic-pae, linux-image-2.6.38-13-generic, linux-image-2.6.38-13-powerpc64-smp, linux, linux-image-2.6.38-13-powerpc-smp, linux-image-2.6.38-13-powerpc, linux-image-2.6.38-13-virtual
  • USN-1363-1: linux-image-3.0.0-16-server, linux-image-3.0.0-16-omap, linux-image-3.0.0-16-powerpc-smp, linux-image-3.0.0-16-powerpc, linux, linux-image-3.0.0-16-powerpc64-smp, linux-image-3.0.0-16-generic, linux-image-3.0.0-16-virtual, linux-image-3.0.0-16-generic-pae