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Ubuntu 12.04 LTS: 2175-1 Critical: Kernel Denial of Service Exploit

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Calendar Grey April 26, 2014
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Several concerns in Ubuntu Linux LTS Quantal demand prompt resolution. It's recommended to perform updates for maintaining system stability and safeguarding security.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-quantal: Linux hardware enablement kernel from Quantal

Details:

A flaw was discovered in the Kernel Virtual Machine (KVM) subsystem of the

Linux kernel. A guest OS user could exploit this flaw to execute arbitrary

code on the host OS. (CVE-2014-0049)

Al Viro discovered an error in how CIFS in the Linux kernel handles

uncached write operations. An unprivileged local user could exploit this

flaw to cause a denial of service (system crash), obtain sensitive

information from kernel memory, or possibly gain privileges.

(CVE-2014-0069)

Topics%20covered

Topics Covered

security advisory denial of service ubuntu kernel exploit linux-lts-quantal

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.5.0-49-generic    3.5.0-49.73~precise1

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-2175-1

CVE-2014-0049, CVE-2014-0069

Severity
critical
Lowest
Low
Medium
High
Critical

April 26, 2014

Topics%20covered

Topics Covered

security advisory denial of service ubuntu kernel exploit linux-lts-quantal

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-quantal/3.5.0-49.73~precise1

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