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[USN-1457-1] Linux kernel vulnerabilities

Posted on 31 May 2012
Ubuntu Security

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Ubuntu Security Notice USN-1457-1
May 31, 2012

linux vulnerabilities
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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:

Andy Adamson discovered a flaw in the Linux kernel's NFSv4 implementation=
=2E
A remote NFS server (attacker) could exploit this flaw to cause a denial =
of
service. (CVE-2011-4131)

A flaw was found in the Linux kernel's KVM (Kernel Virtual Machine) virtu=
al
cpu setup. An unprivileged local user could exploit this flaw to crash th=
e
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 addre=
ss
space randomization to make attacking the process with raised privileges
easier. (CVE-2012-2123)

Schacher Raindel discovered a flaw in the Linux kernel's memory handling
when hugetlb is enabled. An unprivileged local attacker could exploit thi=
s
flaw to cause a denial of service and potentially gain higher privileges.=

(CVE-2012-2133)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 11.04:
linux-image-2.6.38-15-generic 2.6.38-15.60
linux-image-2.6.38-15-generic-pae 2.6.38-15.60
linux-image-2.6.38-15-omap 2.6.38-15.60
linux-image-2.6.38-15-powerpc 2.6.38-15.60
linux-image-2.6.38-15-powerpc-smp 2.6.38-15.60
linux-image-2.6.38-15-powerpc64-smp 2.6.38-15.60
linux-image-2.6.38-15-server 2.6.38-15.60
linux-image-2.6.38-15-versatile 2.6.38-15.60
linux-image-2.6.38-15-virtual 2.6.38-15.60

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

References:
http://www.ubuntu.com/usn/usn-1457-1
CVE-2011-4131, CVE-2012-1601, CVE-2012-2121, CVE-2012-2123,
CVE-2012-2133

Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.38-15.60


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