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Ubuntu 12.04 LTS USN-2417-1 Critical Denial Of Service Risk

ubuntu
Calendar Grey November 25, 2014
Dist Ubuntu Esm H88
Several kernel problems addressed in Ubuntu, impacting overall system performance. Upgrade advised to ensure safety.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Nadav Amit reported that the KVM (Kernel Virtual Machine) mishandles

noncanonical addresses when emulating instructions that change the rip

(Instruction Pointer). A guest user with access to I/O or the MMIO can use

this flaw to cause a denial of service (system crash) of the guest.

(CVE-2014-3647)

A flaw was discovered with the handling of the invept instruction in the

KVM (Kernel Virtual Machine) subsystem of the Linux kernel. An unprivileged

guest user could exploit this flaw to cause a denial of service (system

crash) on the guest. (CVE-2014-3646)

A flaw was discovered with invept instruction support when using nested EPT

in the KVM (Kernel Virtual Machine). An unprivileged guest user could

exploit this flaw to cause a denial of service (system crash) on the guest.

(CVE-2014-3645)

Lars Bull reported a race condition in the PIT (programmable interru...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical Ubuntu patch kernel Denial of Service system crash

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-72-generic    3.2.0-72.107
  linux-image-3.2.0-72-generic-pae  3.2.0-72.107
  linux-image-3.2.0-72-highbank   3.2.0-72.107
  linux-image-3.2.0-72-omap       3.2.0-72.107
  linux-image-3.2.0-72-powerpc-smp  3.2.0-72.107
  linux-image-3.2.0-72-powerpc64-smp  3.2.0-72.107
  linux-image-3.2.0-72-virtual    3.2.0-72.107

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

https://ubuntu.com/security/notices/USN-2417-1

CVE-2014-3610, CVE-2014-3611, CVE-2014-3645, CVE-2014-3646,

CVE-2014-3647, CVE-2014-3673, CVE-2014-3687, CVE-2014-3688,

CVE-2014-3690, CVE-2014-4608, CVE-2014-7207, CVE-2014-7975

Severity
critical
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Critical

November 25, 2014

Topics%20covered

Topics Covered

security advisory critical Ubuntu patch kernel Denial of Service system crash

Package Information

https://launchpad.net/ubuntu/+source/linux/3.2.0-72.107

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