[USN-2446-1] Linux kernel vulnerabilities

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iQIcBAEBCgAGBQJUip8rAAoJEAUvNnAY1cPYpYYQALg3Y/71Nfp456ZE/Qik+jrZ
RJT5ip2UfDGu9wCIbyjp1WY03tzZo5kaF70sP+C3JiDR4VcU3wxgjm+pvnx9u0rv
IpdDUVouKi+LD0Rvyi879danXPaxzSv93CYuhVschr7XolVXEvj56dmYOh1qzB1/
LmMDuscLARVp6Ny00sY9Z+LPpeQc4sTZNqsPPbFPktF5eA5qxgdEFmGqYkSoiOTE
IIxpUbMOJyw0i44QTz4oXKeMlqSmligkHCx8WHizgxJeqEKQpLj08W4KYwdxvzsj
EvHJW085S5zL6Ezi3uIDJY+SqAS7cZfHCJ+NXiJEhrKTtMo1YsZ6xdQEJ6DFgScA
66NZqIg17QGUTkrAP3R2ai9qT7Ioe0l04B1xEhQHd35aJMWFL4rVWKAr0qRRZbqH
YM5yA/dh5TyFXPTug+4ZN36P7SUB2JNWEif3P85CnHSYynfHhRZmcywU/s5RLnD+
qT0+1Pan+JggosRgCftVhMCmPM4tLyvxY5uyoI3sL7CoUshOnWaD20DptEFWR2FU
2PcFYXz2qNGo+5Joe7uMXxw9Vk4L+hRYOxHII+7c3ln/lsaRmvsuyQrAlECO5JAe
mYJBnN8D4/DWEpfblA8QYK5FRp9fjhc2b2hm/iG1Gvkd7qahOiFXMJAZqxeTZlI+
nn3XPiTpwc7835t5dzZ5
=BYNy
-----END PGP SIGNATURE-----
==========================================================================
Ubuntu Security Notice USN-2446-1
December 12, 2014

linux vulnerabilities
==========================================================================

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

- Ubuntu 14.04 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)

A flaw in the handling of malformed ASCONF chunks by SCTP (Stream Control
Transmission Protocol) implementation in the Linux kernel was discovered. A
remote attacker could exploit this flaw to cause a denial of service
(system crash). (CVE-2014-3673)

A flaw in the handling of duplicate ASCONF chunks by SCTP (Stream Control
Transmission Protocol) implementation in the Linux kernel was discovered. A
remote attacker could exploit this flaw to cause a denial of service
(panic). (CVE-2014-3687)

It was discovered that excessive queuing by SCTP (Stream Control
Transmission Protocol) implementation in the Linux kernel can cause memory
pressure. A remote attacker could exploit this flaw to cause a denial of
service. (CVE-2014-3688)

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)

The KVM (kernel virtual machine) subsystem of the Linux kernel
miscalculates the number of memory pages during the handling of a mapping
failure. A guest OS user could exploit this to cause a denial of service
(host OS page unpinning) or possibly have unspecified other impact by
leveraging guest OS privileges. (CVE-2014-8369)

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 14.04 LTS:
linux-image-3.13.0-43-generic 3.13.0-43.72
linux-image-3.13.0-43-generic-lpae 3.13.0-43.72
linux-image-3.13.0-43-lowlatency 3.13.0-43.72
linux-image-3.13.0-43-powerpc-e500 3.13.0-43.72
linux-image-3.13.0-43-powerpc-e500mc 3.13.0-43.72
linux-image-3.13.0-43-powerpc-smp 3.13.0-43.72
linux-image-3.13.0-43-powerpc64-emb 3.13.0-43.72
linux-image-3.13.0-43-powerpc64-smp 3.13.0-43.72

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-2446-1
CVE-2014-3673, CVE-2014-3687, CVE-2014-3688, CVE-2014-7825,
CVE-2014-7826, CVE-2014-8134, CVE-2014-8369, CVE-2014-9090

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.13.0-43.72