USN-1448-1: Linux kernel vulnerabilities

21 May 2012

Several security issues were fixed in the kernel.

Releases

Packages

  • linux - Linux kernel

Details

A flaw was found in the Linux kernel's KVM (Kernel Virtual Machine) virtual
cpu setup. An unprivileged local user could exploit this flaw to crash the
system leading to a denial of service. (CVE-2012-1601)

Steve Grubb reported a flaw with Linux fscaps (file system base
capabilities) when used to increase the permissions of a process. For
application on which fscaps are in use a local attacker can disable address
space randomization to make attacking the process with raised privileges
easier. (CVE-2012-2123)

A flaw was found in how the Linux kernel passed the replacement session
keyring to a child process. An unprivileged local user could exploit this
flaw to cause a denial of service (panic). (CVE-2012-2745)

Update instructions

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

Ubuntu 12.04

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-1457-1: linux-image-2.6.38-15-virtual, linux-image-2.6.38-15-versatile, linux, linux-image-2.6.38-15-powerpc-smp, linux-image-2.6.38-15-powerpc, linux-image-2.6.38-15-omap, linux-image-2.6.38-15-generic-pae, linux-image-2.6.38-15-generic, linux-image-2.6.38-15-server, linux-image-2.6.38-15-powerpc64-smp
  • USN-1459-1: linux-ti-omap4, linux-image-3.0.0-1210-omap4
  • USN-1567-1: linux-image-2.6.38-16-generic, linux-image-2.6.38-16-virtual, linux-image-2.6.38-16-omap, linux-image-2.6.38-16-generic-pae, linux-image-2.6.38-16-server, linux, linux-image-2.6.38-16-powerpc-smp, linux-image-2.6.38-16-powerpc64-smp, linux-image-2.6.38-16-versatile, linux-image-2.6.38-16-powerpc
  • USN-1455-1: linux-image-3.0.0-20-virtual, linux-image-3.0.0-20-generic, linux-image-3.0.0-20-generic-pae, linux-image-3.0.0-20-server, linux-lts-backport-oneiric
  • USN-1574-1: linux-image-2.6.38-16-generic, linux-lts-backport-natty, linux-image-2.6.38-16-virtual, linux-image-2.6.38-16-generic-pae, linux-image-2.6.38-16-server
  • USN-1597-1: linux-image-2.6.32-349-ec2, linux-ec2
  • USN-1507-1: linux-image-2.6.24-32-hppa64, linux-image-2.6.24-32-virtual, linux-image-2.6.24-32-sparc64, linux-image-2.6.24-32-hppa32, linux-image-2.6.24-32-generic, linux-image-2.6.24-32-386, linux-image-2.6.24-32-sparc64-smp, linux-image-2.6.24-32-mckinley, linux-image-2.6.24-32-openvz, linux, linux-image-2.6.24-32-powerpc64-smp, linux-image-2.6.24-32-rt, linux-image-2.6.24-32-lpiacompat, linux-image-2.6.24-32-powerpc, linux-image-2.6.24-32-powerpc-smp, linux-image-2.6.24-32-itanium, linux-image-2.6.24-32-xen, linux-image-2.6.24-32-server, linux-image-2.6.24-32-lpia
  • USN-1470-1: linux-image-2.6.38-15-virtual, linux-lts-backport-natty, linux-image-2.6.38-15-generic-pae, linux-image-2.6.38-15-generic, linux-image-2.6.38-15-server
  • USN-1445-1: linux-image-2.6.32-41-generic-pae, linux-image-2.6.32-41-lpia, linux-image-2.6.32-41-preempt, linux-image-2.6.32-41-sparc64-smp, linux-image-2.6.32-41-powerpc-smp, linux-image-2.6.32-41-generic, linux-image-2.6.32-41-server, linux-image-2.6.32-41-sparc64, linux, linux-image-2.6.32-41-powerpc, linux-image-2.6.32-41-versatile, linux-image-2.6.32-41-powerpc64-smp, linux-image-2.6.32-41-virtual, linux-image-2.6.32-41-386, linux-image-2.6.32-41-ia64
  • USN-1460-1: linux-ti-omap4, linux-image-3.2.0-1413-omap4
  • USN-1452-1: linux-image-3.0.0-20-virtual, linux, linux-image-3.0.0-20-server, linux-image-3.0.0-20-powerpc, linux-image-3.0.0-20-generic, linux-image-3.0.0-20-generic-pae, linux-image-3.0.0-20-omap, linux-image-3.0.0-20-powerpc-smp, linux-image-3.0.0-20-powerpc64-smp
  • USN-1530-1: linux-ti-omap4, linux-image-2.6.38-1209-omap4
  • USN-1606-1: linux-image-2.6.32-44-server, linux-image-2.6.32-44-generic-pae, linux-image-2.6.32-44-lpia, linux-image-2.6.32-44-powerpc, linux-image-2.6.32-44-versatile, linux-image-2.6.32-44-ia64, linux-image-2.6.32-44-sparc64, linux-image-2.6.32-44-powerpc64-smp, linux-image-2.6.32-44-virtual, linux, linux-image-2.6.32-44-386, linux-image-2.6.32-44-sparc64-smp, linux-image-2.6.32-44-generic, linux-image-2.6.32-44-powerpc-smp, linux-image-2.6.32-44-preempt
  • USN-1453-1: linux-ec2, linux-image-2.6.32-345-ec2