==========================================================================
Ubuntu Security Notice USN-1380-1
February 29, 2012
linux vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.04
Summary:
Several security issues were fixed in the kernel.
Software Description:
- linux: Linux kernel
Details:
The linux kernel did not properly account for PTE pages when deciding which
task to kill in out of memory conditions. A local, unprivileged could
exploit this flaw to cause a denial of service. (CVE-2011-2498)
A flaw was discovered in the TOMOYO LSM's handling of mount system calls.
An unprivileged user could oops the system causing a denial of service.
(CVE-2011-2518)
A bug was discovered in the Linux kernel's calculation of OOM (Out of
memory) scores, that would result in the wrong process being killed. A user
could use this to kill the process with the highest OOM score, even if that
process belongs to another user or the system. (CVE-2011-4097)
A flaw was found in the linux kernels IPv4 IGMP query processing. A remote
attacker could exploit this to cause a denial of service. (CVE-2012-0207)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 11.04:
linux-image-2.6.38-13-generic 2.6.38-13.56
linux-image-2.6.38-13-generic-pae 2.6.38-13.56
linux-image-2.6.38-13-omap 2.6.38-13.56
linux-image-2.6.38-13-powerpc 2.6.38-13.56
linux-image-2.6.38-13-powerpc-smp 2.6.38-13.56
linux-image-2.6.38-13-powerpc64-smp 2.6.38-13.56
linux-image-2.6.38-13-server 2.6.38-13.56
linux-image-2.6.38-13-versatile 2.6.38-13.56
linux-image-2.6.38-13-virtual 2.6.38-13.56
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1380-1
CVE-2011-2498, CVE-2011-2518, CVE-2011-4097, CVE-2012-0207
Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.38-13.56
