==========================================================================
Ubuntu Security Notice USN-3485-1
November 21, 2017

linux, linux-aws, linux-gke, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-kvm: Linux kernel for cloud environments
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

It was discovered that a race condition existed in the ALSA subsystem of
the Linux kernel when creating and deleting a port via ioctl(). A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2017-15265)

Eric Biggers discovered that the key management subsystem in the Linux
kernel did not properly restrict adding a key that already exists but is
uninstantiated. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2017-15299)

It was discovered that a race condition existed in the packet fanout
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2017-15649)

Eric Biggers discovered a race condition in the key management subsystem of
the Linux kernel around keys in a negative state. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2017-15951)

Andrey Konovalov discovered a use-after-free vulnerability in the USB
serial console driver in the Linux kernel. A physically proximate attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2017-16525)

Andrey Konovalov discovered that the Ultra Wide Band driver in the Linux
kernel did not properly check for an error condition. A physically
proximate attacker could use this to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2017-16526)

Andrey Konovalov discovered that the ALSA subsystem in the Linux kernel
contained a use-after-free vulnerability. A local attacker could use this
to cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2017-16527)

Andrey Konovalov discovered that the ALSA subsystem in the Linux kernel did
not properly validate USB audio buffer descriptors. A physically proximate
attacker could use this cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2017-16529)

Andrey Konovalov discovered that the USB unattached storage driver in the
Linux kernel contained out-of-bounds error when handling alternative
settings. A physically proximate attacker could use to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2017-16530)

Andrey Konovalov discovered that the USB subsystem in the Linux kernel did
not properly validate USB interface association descriptors. A physically
proximate attacker could use this to cause a denial of service (system
crash). (CVE-2017-16531)

Andrey Konovalov discovered that the USB subsystem in the Linux kernel did
not properly validate USB HID descriptors. A physically proximate attacker
could use this to cause a denial of service (system crash).
(CVE-2017-16533)

Andrey Konovalov discovered that the USB subsystem in the Linux kernel did
not properly validate CDC metadata. A physically proximate attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2017-16534)

Andrey Konovalov discovered that the USB subsystem in the Linux kernel did
not properly validate USB BOS metadata. A physically proximate attacker
could use this to cause a denial of service (system crash).
(CVE-2017-16535)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-101-generic   4.4.0-101.124
  linux-image-4.4.0-101-generic-lpae  4.4.0-101.124
  linux-image-4.4.0-101-lowlatency  4.4.0-101.124
  linux-image-4.4.0-101-powerpc-e500mc  4.4.0-101.124
  linux-image-4.4.0-101-powerpc-smp  4.4.0-101.124
  linux-image-4.4.0-101-powerpc64-emb  4.4.0-101.124
  linux-image-4.4.0-101-powerpc64-smp  4.4.0-101.124
  linux-image-4.4.0-1010-kvm      4.4.0-1010.15
  linux-image-4.4.0-1034-gke      4.4.0-1034.34
  linux-image-4.4.0-1041-aws      4.4.0-1041.50
  linux-image-4.4.0-1077-raspi2   4.4.0-1077.85
  linux-image-4.4.0-1079-snapdragon  4.4.0-1079.84
  linux-image-aws                 4.4.0.1041.43
  linux-image-generic             4.4.0.101.106
  linux-image-generic-lpae        4.4.0.101.106
  linux-image-gke                 4.4.0.1034.35
  linux-image-kvm                 4.4.0.1010.10
  linux-image-lowlatency          4.4.0.101.106
  linux-image-powerpc-e500mc      4.4.0.101.106
  linux-image-powerpc-smp         4.4.0.101.106
  linux-image-powerpc64-emb       4.4.0.101.106
  linux-image-powerpc64-smp       4.4.0.101.106
  linux-image-raspi2              4.4.0.1077.77
  linux-image-snapdragon          4.4.0.1079.71

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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
  https://www.ubuntu.com/usn/usn-3485-1
  CVE-2017-15265, CVE-2017-15299, CVE-2017-15649, CVE-2017-15951,
  CVE-2017-16525, CVE-2017-16526, CVE-2017-16527, CVE-2017-16529,
  CVE-2017-16530, CVE-2017-16531, CVE-2017-16533, CVE-2017-16534,
  CVE-2017-16535

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-101.124
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1041.50
  https://launchpad.net/ubuntu/+source/linux-gke/4.4.0-1034.34
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1010.15
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1077.85
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1079.84