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[USN-1448-1] Linux kernel vulnerabilities

Posted on 22 May 2012
Ubuntu Security

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Ubuntu Security Notice USN-1448-1
May 21, 2012

linux vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

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)

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)

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-24-generic 3.2.0-24.38
linux-image-3.2.0-24-generic-pae 3.2.0-24.38
linux-image-3.2.0-24-omap 3.2.0-24.38
linux-image-3.2.0-24-powerpc-smp 3.2.0-24.38
linux-image-3.2.0-24-powerpc64-smp 3.2.0-24.38
linux-image-3.2.0-24-virtual 3.2.0-24.38

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-1448-1
CVE-2012-1601, CVE-2012-2123

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-24.38


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