Ubuntu: 1405-1: Linux kernel vulnerabilities
Posted by Benjamin D. Thomas   
Ubuntu Several security issues were fixed in the kernel.
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Ubuntu Security Notice USN-1405-1
March 27, 2012

linux vulnerabilities
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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:

Somnath Kotur discovered an error in the Linux kernel's VLAN (virtual lan)
and be2net drivers. An attacker on the local network could exploit this
flaw to cause a denial of service. (CVE-2011-3347)

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)

Sasha Levin discovered a flaw in the permission checking for device
assignments requested via the kvm ioctl in the Linux kernel. A local user
could use this flaw to crash the system causing a denial of service.
(CVE-2011-4347)

Stephan Bärwolf discovered a flaw in the KVM (kernel-based virtual
machine) subsystem of the Linux kernel. A local unprivileged user can crash
use this flaw to crash VMs causing a deny of service. (CVE-2012-0045)

A flaw was discovered in the Linux kernel's cifs file system. An
unprivileged local user could exploit this flaw to crash the system leading
to a denial of service. (CVE-2012-1090)

H. Peter Anvin reported a flaw in the Linux kernel that could crash the
system. A local user could exploit this flaw to crash the system.
(CVE-2012-1097)

A flaw was discovered in the Linux kernel's cgroups subset. A local
attacker could use this flaw to crash the system. (CVE-2012-1146)

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

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

References:
  http://www.ubuntu.com/usn/usn-1405-1
  CVE-2011-3347, CVE-2011-4127, CVE-2011-4347, CVE-2012-0045,
  CVE-2012-1090, CVE-2012-1097, CVE-2012-1146

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.0.0-16.29