Ubuntu Security Notices
USN-1651-1

USN-1651-1: Linux kernel vulnerability

Publication date

30 November 2012

Overview

The system could be made to crash under certain conditions.

Releases

10.04

Packages

linux - Linux kernel

Details

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. (

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)

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.
(CVE-2013-1827)

Update instructions

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

Learn more about how to get the fixes.

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.

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

Ubuntu Release	Package Version
10.04 lucid	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

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References

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