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USN-1432-1: Linux kernel vulnerabilities

8 May 2012

Several security issues were fixed in the kernel.

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Releases

Packages

Details

A flaw was found in the Linux's kernels ext4 file system when mounted with
a journal. A local, unprivileged user could exploit this flaw to cause a
denial of service. (CVE-2011-4086)

A flaw was discovered in the Linux kernel's cifs file system. An
unprivileged local user could exploit this flaw to crash the system leading
to a denial of service. (CVE-2012-1090)

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)

Tetsuo Handa reported a flaw in the OOM (out of memory) killer of the Linux
kernel. A local unprivileged user can exploit this flaw to cause system
unstability and denial of services. (CVE-2012-4398)

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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.

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Update instructions

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

Ubuntu 11.04

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.

References

Related notices

  • USN-1453-1: linux-ec2, linux-image-2.6.32-345-ec2
  • USN-1440-1: linux-image-2.6.38-15-virtual, linux-image-2.6.38-15-generic-pae, linux-lts-backport-natty, linux-image-2.6.38-15-server, linux-image-2.6.38-15-generic
  • USN-1433-1: linux-image-3.0.0-19-virtual, linux-image-3.0.0-19-server, linux-lts-backport-oneiric, linux-image-3.0.0-19-generic-pae, linux-image-3.0.0-19-generic
  • USN-1446-1: linux-ti-omap4, linux-image-3.0.0-1209-omap4
  • USN-1454-1: linux-image-2.6.24-31-powerpc, linux-image-2.6.24-31-mckinley, linux-image-2.6.24-31-openvz, linux-image-2.6.24-31-sparc64, linux-image-2.6.24-31-generic, linux-image-2.6.24-31-hppa64, linux-image-2.6.24-31-server, linux-image-2.6.24-31-powerpc-smp, linux-image-2.6.24-31-lpia, linux-image-2.6.24-31-rt, linux-image-2.6.24-31-sparc64-smp, linux-image-2.6.24-31-lpiacompat, linux-image-2.6.24-31-itanium, linux-image-2.6.24-31-386, linux-image-2.6.24-31-hppa32, linux-image-2.6.24-31-xen, linux-image-2.6.24-31-powerpc64-smp, linux, linux-image-2.6.24-31-virtual
  • USN-1431-1: linux-image-3.0.0-19-omap, linux-image-3.0.0-19-virtual, linux-image-3.0.0-19-server, linux-image-3.0.0-19-generic-pae, linux-image-3.0.0-19-powerpc64-smp, linux, linux-image-3.0.0-19-powerpc, linux-image-3.0.0-19-generic, linux-image-3.0.0-19-powerpc-smp
  • USN-1458-1: linux-image-2.6.38-1209-omap4, linux-ti-omap4
  • USN-1445-1: linux-image-2.6.32-41-sparc64, linux-image-2.6.32-41-sparc64-smp, linux-image-2.6.32-41-powerpc, linux-image-2.6.32-41-generic, linux-image-2.6.32-41-powerpc-smp, linux-image-2.6.32-41-server, linux-image-2.6.32-41-virtual, linux-image-2.6.32-41-versatile, linux-image-2.6.32-41-lpia, linux-image-2.6.32-41-powerpc64-smp, linux, linux-image-2.6.32-41-generic-pae, linux-image-2.6.32-41-ia64, linux-image-2.6.32-41-386, linux-image-2.6.32-41-preempt
  • USN-1425-1: linux-image-2.6.32-41-sparc64, linux-image-2.6.32-41-sparc64-smp, linux-image-2.6.32-41-powerpc, linux-image-2.6.32-41-generic, linux-image-2.6.32-41-powerpc-smp, linux-image-2.6.32-41-server, linux-image-2.6.32-41-virtual, linux-image-2.6.32-41-versatile, linux-image-2.6.32-41-lpia, linux-image-2.6.32-41-powerpc64-smp, linux, linux-image-2.6.32-41-generic-pae, linux-image-2.6.32-41-ia64, linux-image-2.6.32-41-386, linux-image-2.6.32-41-preempt
  • USN-1426-1: linux-ec2, linux-image-2.6.32-345-ec2
  • USN-1405-1: linux-image-3.0.0-16-powerpc64-smp, linux-image-3.0.0-16-virtual, 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-generic-pae, linux-image-3.0.0-16-server, linux, linux-image-3.0.0-16-omap
  • USN-1388-1: linux-ec2, linux-image-2.6.32-343-ec2
  • USN-1384-1: linux-lts-backport-oneiric, linux-image-3.0.0-16-virtual, linux-image-3.0.0-16-generic, linux-image-3.0.0-16-generic-pae, linux-image-3.0.0-16-server
  • USN-1389-1: linux-image-2.6.32-39-386, linux-image-2.6.32-39-ia64, linux-image-2.6.32-39-lpia, linux-image-2.6.32-39-powerpc, linux-image-2.6.32-39-versatile, linux-image-2.6.32-39-sparc64, linux-image-2.6.32-39-server, linux-image-2.6.32-39-virtual, linux, linux-image-2.6.32-39-powerpc64-smp, linux-image-2.6.32-39-generic, linux-image-2.6.32-39-preempt, linux-image-2.6.32-39-sparc64-smp, linux-image-2.6.32-39-powerpc-smp, linux-image-2.6.32-39-generic-pae
  • USN-1404-1: linux-ti-omap4, linux-image-3.0.0-1208-omap4

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Further reading