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Ubuntu Security Notice USN-2443-1
December 12, 2014

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:

An information leak in the Linux kernel was discovered that could leak the
high 16 bits of the kernel stack address on 32-bit Kernel Virtual Machine
(KVM) paravirt guests. A user in the guest OS could exploit this leak to
obtain information that could potentially be used to aid in attacking the
kernel. (CVE-2014-8134)

Rabin Vincent, Robert Swiecki, Russell King discovered that the ftrace
subsystem of the Linux kernel does not properly handle private syscall
numbers. A local user could exploit this flaw to cause a denial of service
(OOPS). (CVE-2014-7826)

Rabin Vincent, Robert Swiecki, Russell Kinglaw discovered a flaw in how the
perf subsystem of the Linux kernel handles private systecall numbers. A
local user could exploit this to cause a denial of service (OOPS) or bypass
ASLR protections via a crafted application. (CVE-2014-7825)

A null pointer dereference flaw was discovered in the the Linux kernel’s
SCTP implementation when ASCONF is used. A remote attacker could exploit
this flaw to cause a denial of service (system crash) via a malformed INIT
chunk. (CVE-2014-7841)

A stack buffer overflow was discovered in the ioctl command handling for
the Technotrend/Hauppauge USB DEC devices driver. A local user could
exploit this flaw to cause a denial of service (system crash) or possibly
gain privileges. (CVE-2014-8884)

Andy Lutomirski discovered that the Linux kernel does not properly handle
faults associated with the Stack Segment (SS) register on the x86
architecture. A local attacker could exploit this flaw to cause a denial of
service (panic). (CVE-2014-9090)

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-74-generic 3.2.0-74.109
linux-image-3.2.0-74-generic-pae 3.2.0-74.109
linux-image-3.2.0-74-highbank 3.2.0-74.109
linux-image-3.2.0-74-omap 3.2.0-74.109
linux-image-3.2.0-74-powerpc-smp 3.2.0-74.109
linux-image-3.2.0-74-powerpc64-smp 3.2.0-74.109
linux-image-3.2.0-74-virtual 3.2.0-74.109

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:
http://www.ubuntu.com/usn/usn-2443-1
CVE-2014-7825, CVE-2014-7826, CVE-2014-7841, CVE-2014-8134,
CVE-2014-8884, CVE-2014-9090

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-74.109

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