USN-1405-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-1405-1

27th March, 2012

linux vulnerabilities

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

  • Ubuntu 11.10


Several security issues were fixed in the kernel.

Software description

  • linux - Linux kernel


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 version:

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

To update your system, please follow these instructions:

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


CVE-2011-4127, CVE-2012-2100