==========================================================================
Ubuntu Security Notice USN-3617-2
April 03, 2018

linux-hwe, linux-gcp, linux-oem 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-oem: Linux kernel for OEM processors

Details:

USN-3617-1 fixed vulnerabilities in the Linux kernel for Ubuntu 17.10.
This update provides the corresponding updates for the Linux Hardware
Enablement (HWE) kernel from Ubuntu 17.10 for Ubuntu 16.04 LTS.

It was discovered that a race condition leading to a use-after-free
vulnerability existed in the ALSA PCM subsystem of the Linux kernel. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2017-0861)

It was discovered that the KVM implementation in the Linux kernel allowed
passthrough of the diagnostic I/O port 0x80. An attacker in a guest VM
could use this to cause a denial of service (system crash) in the host OS.
(CVE-2017-1000407)

It was discovered that a use-after-free vulnerability existed in the
network namespaces 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-2017-15129)

Andrey Konovalov discovered that the usbtest device driver in the Linux
kernel did not properly validate endpoint metadata. A physically proximate
attacker could use this to cause a denial of service (system crash).
(CVE-2017-16532)

Andrey Konovalov discovered that the SoundGraph iMON USB driver in the
Linux kernel did not properly validate device metadata. A physically
proximate attacker could use this to cause a denial of service (system
crash). (CVE-2017-16537)

Andrey Konovalov discovered that the IMS Passenger Control Unit USB driver
in the Linux kernel did not properly validate device descriptors. A
physically proximate attacker could use this to cause a denial of service
(system crash). (CVE-2017-16645)

Andrey Konovalov discovered that the DiBcom DiB0700 USB DVB driver in the
Linux kernel did not properly handle detach events. A physically proximate
attacker could use this to cause a denial of service (system crash).
(CVE-2017-16646)

Andrey Konovalov discovered that the ASIX Ethernet USB driver in the Linux
kernel did not properly handle suspend and resume events. A physically
proximate attacker could use this to cause a denial of service (system
crash). (CVE-2017-16647)

Andrey Konovalov discovered that the CDC USB Ethernet driver did not
properly validate device descriptors. A physically proximate attacker could
use this to cause a denial of service (system crash). (CVE-2017-16649)

Andrey Konovalov discovered that the QMI WWAN USB driver did not properly
validate device descriptors. A physically proximate attacker could use this
to cause a denial of service (system crash). (CVE-2017-16650)

It was discovered that the HugeTLB component of the Linux kernel did not
properly handle holes in hugetlb ranges. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2017-16994)

It was discovered that the netfilter component of the Linux did not
properly restrict access to the connection tracking helpers list. A local
attacker could use this to bypass intended access restrictions.
(CVE-2017-17448)

It was discovered that the netfilter passive OS fingerprinting (xt_osf)
module did not properly perform access control checks. A local attacker
could improperly modify the system-wide OS fingerprint list.
(CVE-2017-17450)

Dmitry Vyukov discovered that the KVM implementation in the Linux kernel
contained an out-of-bounds read when handling memory-mapped I/O. A local
attacker could use this to expose sensitive information. (CVE-2017-17741)

It was discovered that the Salsa20 encryption algorithm implementations in
the Linux kernel did not properly handle zero-length inputs. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2017-17805)

It was discovered that the HMAC implementation did not validate the state
of the underlying cryptographic hash algorithm. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2017-17806)

It was discovered that the keyring implementation in the Linux kernel did
not properly check permissions when a key request was performed on a tasks'
default keyring. A local attacker could use this to add keys to
unauthorized keyrings. (CVE-2017-17807)

It was discovered that a race condition existed in the OCFS2 file system
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service (kernel deadlock). (CVE-2017-18204)

It was discovered that the Broadcom NetXtremeII ethernet driver in the
Linux kernel did not properly validate Generic Segment Offload (GSO) packet
sizes. An attacker could use this to cause a denial of service (interface
unavailability). (CVE-2018-1000026)

It was discovered that the Reliable Datagram Socket (RDS) implementation in
the Linux kernel contained an out-of-bounds during RDMA page allocation. An
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2018-5332)

Mohamed Ghannam discovered a null pointer dereference in the RDS (Reliable
Datagram Sockets) protocol implementation of the Linux kernel. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2018-5333)

ee3/4ePS discovered that a race condition existed in loop block device
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-2018-5344)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.13.0-1012-gcp     4.13.0-1012.16
  linux-image-4.13.0-1022-oem     4.13.0-1022.24
  linux-image-4.13.0-38-generic   4.13.0-38.43~16.04.1
  linux-image-4.13.0-38-generic-lpae  4.13.0-38.43~16.04.1
  linux-image-4.13.0-38-lowlatency  4.13.0-38.43~16.04.1
  linux-image-gcp                 4.13.0.1012.14
  linux-image-generic-hwe-16.04   4.13.0.38.57
  linux-image-generic-lpae-hwe-16.04  4.13.0.38.57
  linux-image-gke                 4.13.0.1012.14
  linux-image-lowlatency-hwe-16.04  4.13.0.38.57
  linux-image-oem                 4.13.0.1022.26

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://usn.ubuntu.com/usn/usn-3617-2
  https://usn.ubuntu.com/usn/usn-3617-1
  CVE-2017-0861, CVE-2017-1000407, CVE-2017-15129, CVE-2017-16532,
  CVE-2017-16537, CVE-2017-16645, CVE-2017-16646, CVE-2017-16647,
  CVE-2017-16649, CVE-2017-16650, CVE-2017-16994, CVE-2017-17448,
  CVE-2017-17450, CVE-2017-17741, CVE-2017-17805, CVE-2017-17806,
  CVE-2017-17807, CVE-2017-18204, CVE-2018-1000026, CVE-2018-5332,
  CVE-2018-5333, CVE-2018-5344

Package Information:
  https://launchpad.net/ubuntu/+source/linux-gcp/4.13.0-1012.16
  https://launchpad.net/ubuntu/+source/linux-hwe/4.13.0-38.43~16.04.1
  https://launchpad.net/ubuntu/+source/linux-oem/4.13.0-1022.24