USN-1651-1: Linux kernel vulnerability

Ubuntu Security Notice USN-1651-1

30th November, 2012

linux vulnerability

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

  • Ubuntu 10.04 LTS


The system could be made to crash under certain conditions.

Software description

  • linux - Linux kernel


Rodrigo Freire discovered a flaw in the Linux kernel's TCP illinois
congestion control algorithm. A local attacker could use this to cause a
denial of service. (CVE-2012-4565)

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)

Denys Fedoryshchenko discovered a flaw in the Linux kernel's TCP receive
processing for IPv4. A remote attacker could exploit this flaw to cause a
denial of service (kernel resource consumption) via a flood of SYN+FIN TCP
packets. (CVE-2012-6638)

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)

Mathias Krause discover an error in Linux kernel's Datagram Congestion
Control Protocol (DCCP) Congestion Control Identifier (CCID) use. A local
attack could exploit this flaw to cause a denial of service (crash) and
potentially escalate privileges if the user can mmap page 0.

Update instructions

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

Ubuntu 10.04 LTS:
linux-image-2.6.32-45-generic 2.6.32-45.100
linux-image-2.6.32-45-powerpc-smp 2.6.32-45.100
linux-image-2.6.32-45-ia64 2.6.32-45.100
linux-image-2.6.32-45-lpia 2.6.32-45.100
linux-image-2.6.32-45-preempt 2.6.32-45.100
linux-image-2.6.32-45-sparc64-smp 2.6.32-45.100
linux-image-2.6.32-45-virtual 2.6.32-45.100
linux-image-2.6.32-45-sparc64 2.6.32-45.100
linux-image-2.6.32-45-generic-pae 2.6.32-45.100
linux-image-2.6.32-45-server 2.6.32-45.100
linux-image-2.6.32-45-powerpc 2.6.32-45.100
linux-image-2.6.32-45-386 2.6.32-45.100
linux-image-2.6.32-45-powerpc64-smp 2.6.32-45.100
linux-image-2.6.32-45-versatile 2.6.32-45.100

To update your system, please follow these instructions:

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.


CVE-2012-4565, CVE-2012-6547, CVE-2012-6638, CVE-2012-6647, CVE-2013-0310, CVE-2013-1827