USN-1935-1: Linux kernel vulnerabilities

20 August 2013

linux vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 13.04

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel

Details

Chanam Park reported a Null pointer flaw in the Linux kernel’s Ceph client. A remote attacker could exploit this flaw to cause a denial of service (system crash). (CVE-2013-1059)

An information leak was discovered in the Linux kernel’s fanotify interface. A local user could exploit this flaw to obtain sensitive information from kernel memory. (CVE-2013-2148)

Jonathan Salwan discovered an information leak in the Linux kernel’s cdrom driver. A local user can exploit this leak to obtain sensitive information from kernel memory if the CD-ROM drive is malfunctioning. (CVE-2013-2164)

Kees Cook discovered a format string vulnerability in the Linux kernel’s disk block layer. A local user with administrator privileges could exploit this flaw to gain kernel privileges. (CVE-2013-2851)

Hannes Frederic Sowa discovered that the Linux kernel’s IPv6 stack does not correctly handle Router Advertisement (RA) message in some cases. A remote attacker could exploit this flaw to cause a denial of service (system crash). (CVE-2013-4125)

A vulnerability was discovered in the Linux kernel’s vhost net driver. A local user could cause a denial of service (system crash) by powering on a virtual machine. (CVE-2013-4127)

Update instructions

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

Ubuntu 13.04
linux-image-3.8.0-29-generic - 3.8.0-29.42

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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