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Ubuntu 12.04 LTS USN-2463-1 Critical: Kernel Denial of Service

ubuntu
Calendar Grey January 13, 2015
Dist Ubuntu Esm H88
Numerous vital system vulnerabilities were tackled in Fedora 20 to improve overall performance and reliability.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

A race condition with MMIO and PIO transactions in the KVM (Kernel Virtual

Machine) subsystem of the Linux kernel was discovered. A guest OS user

could exploit this flaw to cause a denial of service (guest OS crash) via a

specially crafted application. (CVE-2014-7842)

The KVM (kernel virtual machine) subsystem of the Linux kernel

miscalculates the number of memory pages during the handling of a mapping

failure. A guest OS user could exploit this to cause a denial of service

(host OS page unpinning) or possibly have unspecified other impact by

leveraging guest OS privileges. (CVE-2014-8369)

Topics%20covered

Topics Covered

security advisory critical Ubuntu kernel Denial of Service KVM

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-75-generic    3.2.0-75.110
  linux-image-3.2.0-75-generic-pae  3.2.0-75.110
  linux-image-3.2.0-75-highbank   3.2.0-75.110
  linux-image-3.2.0-75-omap       3.2.0-75.110
  linux-image-3.2.0-75-powerpc-smp  3.2.0-75.110
  linux-image-3.2.0-75-powerpc64-smp  3.2.0-75.110
  linux-image-3.2.0-75-virtual    3.2.0-75.110

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-2463-1

CVE-2014-7842, CVE-2014-8369

Severity
critical
Lowest
Low
Medium
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Critical

January 13, 2015

Topics%20covered

Topics Covered

security advisory critical Ubuntu kernel Denial of Service KVM

Package Information

https://launchpad.net/ubuntu/+source/linux/3.2.0-75.110

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