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[USN-1473-1] Linux kernel vulnerabilities

Posted on 13 June 2012
Ubuntu Security

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Ubuntu Security Notice USN-1473-1
June 13, 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 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)

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)

Stephan Mueller reported a flaw in the Linux kernel's dl2k network driver=
's
handling of ioctls. An unprivileged local user could leverage this flaw t=
o
cause a denial of service. (CVE-2012-2313)

Timo Warns reported multiple flaws in the Linux kernel's hfsplus
filesystem. An unprivileged local user could exploit these flaws to gain
root system priviliges. (CVE-2012-2319)

Xi Wang discovered a flaw in the Linux kernel's i915 graphics driver
handling of cliprect on 32 bit systems. An unprivileged local attacker
could leverage this flaw to cause a denial of service or potentially gain=

root privileges. (CVE-2012-2383)

Xi Wang discovered a flaw in the Linux kernel's i915 graphics driver
handling of buffer_count on 32 bit systems. An unprivileged local attacke=
r
could leverage this flaw to cause a denial of service or potentially gain=

root privileges. (CVE-2012-2384)

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-25-generic 3.2.0-25.40
linux-image-3.2.0-25-generic-pae 3.2.0-25.40
linux-image-3.2.0-25-highbank 3.2.0-25.40
linux-image-3.2.0-25-omap 3.2.0-25.40
linux-image-3.2.0-25-powerpc-smp 3.2.0-25.40
linux-image-3.2.0-25-powerpc64-smp 3.2.0-25.40
linux-image-3.2.0-25-virtual 3.2.0-25.40

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-1473-1
CVE-2012-2121, CVE-2012-2133, CVE-2012-2313, CVE-2012-2319,
CVE-2012-2383, CVE-2012-2384

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-25.40


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