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[USN-1567-1] Linux kernel vulnerabilities

Posted on 14 September 2012
Ubuntu Security

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Ubuntu Security Notice USN-1567-1
September 14, 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:

A flaw was found in how the Linux kernel passed the replacement session
keyring to a child process. An unprivileged local user could exploit this=

flaw to cause a denial of service (panic). (CVE-2012-2745)

Ben Hutchings reported a flaw in the Linux kernel with some network drive=
rs
that support TSO (TCP segment offload). A local or peer user could exploi=
t
this flaw to to cause a denial of service. (CVE-2012-3412)

Jay Fenlason and Doug Ledford discovered a bug in the Linux kernel
implementation of RDS sockets. A local unprivileged user could potentiall=
y
use this flaw to read privileged information from the kernel.
(CVE-2012-3430)

A flaw was discovered in the madvise feature of the Linux kernel's memory=

subsystem. An unprivileged local use could exploit the flaw to cause a
denial of service (crash the system). (CVE-2012-3511)

Update instructions:

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

Ubuntu 11.04:
linux-image-2.6.38-16-generic 2.6.38-16.67
linux-image-2.6.38-16-generic-pae 2.6.38-16.67
linux-image-2.6.38-16-omap 2.6.38-16.67
linux-image-2.6.38-16-powerpc 2.6.38-16.67
linux-image-2.6.38-16-powerpc-smp 2.6.38-16.67
linux-image-2.6.38-16-powerpc64-smp 2.6.38-16.67
linux-image-2.6.38-16-server 2.6.38-16.67
linux-image-2.6.38-16-versatile 2.6.38-16.67
linux-image-2.6.38-16-virtual 2.6.38-16.67

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

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic=
,
linux-server, linux-powerpc), a standard system upgrade will automaticall=
y
perform this as well.

References:
http://www.ubuntu.com/usn/usn-1567-1
CVE-2012-2745, CVE-2012-3412, CVE-2012-3430, CVE-2012-3511

Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.38-16.67


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