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Alerts This Week
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Ubuntu 12.04 LTS: USN-1971-1 Moderate Kernel Flaws Exploiting Threats

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Calendar Grey September 27, 2013
Scroller Ubuntu
Addressed issues in Ubuntu 12.04 LTS: linux-lts-quantal kernel impacting system integrity and user safety.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-raring: Linux hardware enablement kernel from Raring

Details:

Vince Weaver discovered a flaw in the perf subsystem of the Linux kernel on

ARM platforms. A local user could exploit this flaw to gain privileges or

cause a denial of service (system crash). (CVE-2013-4254)

A memory leak was discovered in the user namespace facility of the Linux

kernel. A local user could cause a denial of service (memory consumption)

via the CLONE_NEWUSER unshare call. (CVE-2013-4205)

Topics%20covered

Topics Covered

security advisory denial of service privilege escalation kernel flaw linux-lts-raring

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.8.0-31-generic    3.8.0-31.46~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-1971-1

CVE-2013-4205, CVE-2013-4254

September 27, 2013

Topics%20covered

Topics Covered

security advisory denial of service privilege escalation kernel flaw linux-lts-raring

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-raring/3.8.0-31.46~precise1

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