1. Ubuntu Security Notices
  2. USN-1971-1

USN-1971-1: Linux kernel (Raring HWE) vulnerabilities

Publication date

27 September 2013

Overview

Several security issues were fixed in the kernel.

Releases

Packages

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)

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)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
12.04 precise linux-image-3.8.0-31-generic –  3.8.0-31.46~precise1

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References

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