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Ubuntu 11.10 USN-1405-1 Moderate: Kernel DoS and Local Exploits

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Calendar Grey March 27, 2012
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Security fixes in the Ubuntu kernel address vulnerabilities and their potential exploit paths for better protection.
Several security issues were fixed in the kernel.

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 servi...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu local exploit kernel fix

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

https://ubuntu.com/security/notices/USN-1405-1

CVE-2011-3347, CVE-2011-4127, CVE-2011-4347, CVE-2012-0045,

CVE-2012-1090, CVE-2012-1097, CVE-2012-1146

March 27, 2012

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu local exploit kernel fix

Package Information

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

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