Ubuntu Security Notice USN-1457-1
31st May, 2012
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.04
Several security issues were fixed in the kernel.
- linux - Linux kernel
Andy Adamson discovered a flaw in the Linux kernel's NFSv4 implementation.
A remote NFS server (attacker) could exploit this flaw to cause a denial of
A flaw was found in the Linux kernel's KVM (Kernel Virtual Machine) virtual
cpu setup. An unprivileged local user could exploit this flaw to crash the
system leading to a denial of service. (CVE-2012-1601)
A flaw was discovered in the Linux kernel's KVM (kernel virtual machine).
An administrative user in the guest OS could leverage this flaw to cause a
denial of service in the host OS. (CVE-2012-2121)
Steve Grubb reported a flaw with Linux fscaps (file system base
capabilities) when used to increase the permissions of a process. For
application on which fscaps are in use a local attacker can disable address
space randomization to make attacking the process with raised privileges
Schacher Raindel discovered a flaw in the Linux kernel's memory handling
when hugetlb is enabled. An unprivileged local attacker could exploit this
flaw to cause a denial of service and potentially gain higher privileges.
The problem can be corrected by updating your system to the following package version:
- Ubuntu 11.04:
- linux-image-2.6.38-15-powerpc 2.6.38-15.60
- linux-image-2.6.38-15-omap 2.6.38-15.60
- linux-image-2.6.38-15-generic-pae 2.6.38-15.60
- linux-image-2.6.38-15-server 2.6.38-15.60
- linux-image-2.6.38-15-powerpc64-smp 2.6.38-15.60
- linux-image-2.6.38-15-virtual 2.6.38-15.60
- linux-image-2.6.38-15-versatile 2.6.38-15.60
- linux-image-2.6.38-15-generic 2.6.38-15.60
- linux-image-2.6.38-15-powerpc-smp 2.6.38-15.60
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.