USN-1405-1: Linux kernel vulnerabilities

27 March 2012

linux vulnerabilities

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

  • Ubuntu 11.10

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel

Details

Paolo Bonzini discovered a flaw in Linux’s handling of the SG_IO ioctl command. A local user, or user in a VM could exploit this flaw to bypass restrictions and gain read/write access to all data on the affected block device. (CVE-2011-4127)

A flaw was found in the Linux kernel’s ext4 file system when mounting a corrupt filesystem. A user-assisted remote attacker could exploit this flaw to cause a denial of service. (CVE-2012-2100)

Update instructions

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

Ubuntu 11.10
linux-image-3.0.0-16-generic - 3.0.0-16.29
linux-image-3.0.0-16-generic-pae - 3.0.0-16.29
linux-image-3.0.0-16-omap - 3.0.0-16.29
linux-image-3.0.0-16-powerpc - 3.0.0-16.29
linux-image-3.0.0-16-powerpc-smp - 3.0.0-16.29
linux-image-3.0.0-16-powerpc64-smp - 3.0.0-16.29
linux-image-3.0.0-16-server - 3.0.0-16.29
linux-image-3.0.0-16-virtual - 3.0.0-16.29

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