[USN-3469-1] Linux kernel vulnerabilities

Tue Oct 31 10:37:06 UTC 2017

==========================================================================
Ubuntu Security Notice USN-3469-1
October 31, 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:

Anthony Perard discovered that the Xen virtual block driver did not
properly initialize some data structures before passing them to user space.
A local attacker in a guest VM could use this to expose sensitive
information from the host OS or other guest VMs. (CVE-2017-10911)

Bo Zhang discovered that the netlink wireless configuration interface in
the Linux kernel did not properly validate attributes when handling certain
requests. A local attacker with the CAP_NET_ADMIN could use this to cause a
denial of service (system crash). (CVE-2017-12153)

It was discovered that the nested KVM implementation in the Linux
kernel in some situations did not properly prevent second level guests
from reading and writing the hardware CR8 register. A local attacker
in a guest could use this to cause a denial of service (system crash).

It was discovered that the key management subsystem in the Linux kernel
did not properly restrict key reads on negatively instantiated keys. A
local attacker could use this to cause a denial of service (system crash).
(CVE-2017-12192)

It was discovered that an integer overflow existed in the sysfs interface
for the QLogic 24xx+ series SCSI driver in the Linux kernel. A local
privileged attacker could use this to cause a denial of service (system
crash). (CVE-2017-14051)

It was discovered that the ATI Radeon framebuffer driver in the Linux
kernel did not properly initialize a data structure returned to user space.
A local attacker could use this to expose sensitive information (kernel
memory). (CVE-2017-14156)

Dave Chinner discovered that the XFS filesystem did not enforce that the
realtime inode flag was settable only on filesystems on a realtime device.
A local attacker could use this to cause a denial of service (system
crash). (CVE-2017-14340)

ChunYu Wang discovered that the iSCSI transport implementation in the Linux
kernel did not properly validate data structures. A local attacker could
use this to cause a denial of service (system crash). (CVE-2017-14489)

It was discovered that the generic SCSI driver in the Linux kernel did not
properly initialize data returned to user space in some situations. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2017-14991)

Dmitry Vyukov discovered that the Floating Point Unit (fpu) subsystem in
the Linux kernel did not properly handle attempts to set reserved bits in a
task's extended state (xstate) area. A local attacker could use this to
cause a denial of service (system crash). (CVE-2017-15537)

Pengfei Wang discovered that the Turtle Beach MultiSound audio device
driver in the Linux kernel contained race conditions when fetching
from the ring-buffer. A local attacker could use this to cause a
denial of service (infinite loop). (CVE-2017-9984, CVE-2017-9985)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1009-kvm      4.4.0-1009.14
  linux-image-4.4.0-1033-gke      4.4.0-1033.33
  linux-image-4.4.0-1039-aws      4.4.0-1039.48
  linux-image-4.4.0-1076-raspi2   4.4.0-1076.84
  linux-image-4.4.0-1078-snapdragon  4.4.0-1078.83
  linux-image-4.4.0-98-generic    4.4.0-98.121
  linux-image-4.4.0-98-generic-lpae  4.4.0-98.121
  linux-image-4.4.0-98-lowlatency  4.4.0-98.121
  linux-image-4.4.0-98-powerpc-e500mc  4.4.0-98.121
  linux-image-4.4.0-98-powerpc-smp  4.4.0-98.121
  linux-image-4.4.0-98-powerpc64-emb  4.4.0-98.121
  linux-image-4.4.0-98-powerpc64-smp  4.4.0-98.121
  linux-image-aws                 4.4.0.1039.41
  linux-image-generic             4.4.0.98.103
  linux-image-generic-lpae        4.4.0.98.103
  linux-image-gke                 4.4.0.1033.34
  linux-image-kvm                 4.4.0.1009.9
  linux-image-lowlatency          4.4.0.98.103
  linux-image-powerpc-e500mc      4.4.0.98.103
  linux-image-powerpc-smp         4.4.0.98.103
  linux-image-powerpc64-emb       4.4.0.98.103
  linux-image-powerpc64-smp       4.4.0.98.103
  linux-image-raspi2              4.4.0.1076.76
  linux-image-snapdragon          4.4.0.1078.70

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-3469-1
  CVE-2017-10911, CVE-2017-12153, CVE-2017-12154, CVE-2017-12192,
  CVE-2017-14051, CVE-2017-14156, CVE-2017-14340, CVE-2017-14489,
  CVE-2017-14991, CVE-2017-15537, CVE-2017-9984, CVE-2017-9985

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-98.121
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1039.48
  https://launchpad.net/ubuntu/+source/linux-gke/4.4.0-1033.33
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1009.14
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1076.84
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1078.83

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