USN-1579-1: Linux kernel vulnerabilities

Releases

• Ubuntu 12.04

Packages

• linux - Linux kernel

Details

Ben Hutchings reported a flaw in the Linux kernel with some network drivers
that support TSO (TCP segment offload). A local or peer user could exploit
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 potentially
use this flaw to read privileged information from the kernel.
(CVE-2012-3430)

Mathias Krause discovered an information leak in the Linux kernel's TUN/TAP
device driver. A local user could exploit this flaw to examine part of the
kernel's stack memory. (CVE-2012-6547)

A flaw was discovered in the requeuing of futexes in the Linux kernel. A
local user could exploit this flaw to cause a denial of service (system
crash) or possibly have other unspecified impact. (CVE-2012-6647)

A flaw was found in Linux kernel's validation of CIPSO (Common IP Security
Option) options set from userspace. A local user that can set a socket's
CIPSO options could exploit this flaw to cause a denial of service (crash
the system). (CVE-2013-0310)

Update instructions

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

Ubuntu 12.04

• linux-image-3.2.0-31-highbank - 3.2.0-31.50
• linux-image-3.2.0-31-omap - 3.2.0-31.50
• linux-image-3.2.0-31-generic-pae - 3.2.0-31.50
• linux-image-3.2.0-31-powerpc64-smp - 3.2.0-31.50
• linux-image-3.2.0-31-virtual - 3.2.0-31.50
• linux-image-3.2.0-31-generic - 3.2.0-31.50
• linux-image-3.2.0-31-powerpc-smp - 3.2.0-31.50

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 automatically
perform this as well.

References

• CVE-2012-3412
• CVE-2012-3430
• CVE-2012-6547
• CVE-2012-6647
• CVE-2013-0310

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