USN-1453-1: Linux kernel (EC2) vulnerabilities

25 May 2012

linux-ec2 vulnerabilities

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

  • Ubuntu 10.04 LTS

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux-ec2 - Linux kernel for EC2

Details

A flaw was found in the Linux’s kernels ext4 file system when mounted with a journal. A local, unprivileged user could exploit this flaw to cause a denial of service. (CVE-2011-4086)

A flaw was found in the Linux kernel’s KVM (Kernel Virtual Machine) virtual cpu setup. An unprivileged local user could exploit this flaw to crash the system leading to a denial of service. (CVE-2012-1601)

Steve Grubb reported a flaw with Linux fscaps (file system base capabilities) when used to increase the permissions of a process. For application on which fscaps are in use a local attacker can disable address space randomization to make attacking the process with raised privileges easier. (CVE-2012-2123)

Update instructions

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

Ubuntu 10.04 LTS
linux-image-2.6.32-345-ec2 - 2.6.32-345.48

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.

References