USN-1421-1: Linux kernel (Maverick backport) vulnerabilities

Ubuntu Security Notice USN-1421-1

12th April, 2012

linux-lts-backport-maverick 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-lts-backport-maverick - Linux kernel backport from Maverick

Details

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)

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 version:

Ubuntu 10.04 LTS:
linux-image-2.6.35-32-virtual 2.6.35-32.68~lucid1
linux-image-2.6.35-32-server 2.6.35-32.68~lucid1
linux-image-2.6.35-32-generic-pae 2.6.35-32.68~lucid1
linux-image-2.6.35-32-generic 2.6.35-32.68~lucid1

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

CVE-2011-4347, CVE-2012-0045, CVE-2012-1097, CVE-2012-1146