[USN-4163-2] Linux kernel (Xenial HWE) vulnerabilities

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[USN-4163-2] Linux kernel (Xenial HWE) vulnerabilities

Steve Beattie
==========================================================================
Ubuntu Security Notice USN-4163-2
October 23, 2019

linux-lts-xenial, linux-aws vulnerabilities
==========================================================================

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

- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

USN-4163-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
14.04 ESM.

It was discovered that a race condition existed in the ARC EMAC ethernet
driver for the Linux kernel, resulting in a use-after-free vulnerability.
An attacker could use this to cause a denial of service (system crash).
(CVE-2016-10906)

It was discovered that a race condition existed in the Serial Attached SCSI
(SAS) implementation in the Linux kernel when handling certain error
conditions. A local attacker could use this to cause a denial of service
(kernel deadlock). (CVE-2017-18232)

It was discovered that the RSI 91x Wi-Fi driver in the Linux kernel did not
did not handle detach operations correctly, leading to a use-after-free
vulnerability. A physically proximate attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-21008)

Wen Huang discovered that the Marvell Wi-Fi device driver in the Linux
kernel did not properly perform bounds checking, leading to a heap
overflow. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2019-14814,
CVE-2019-14816)

Matt Delco discovered that the KVM hypervisor implementation in the Linux
kernel did not properly perform bounds checking when handling coalesced
MMIO write operations. A local attacker with write access to /dev/kvm could
use this to cause a denial of service (system crash). (CVE-2019-14821)

Hui Peng and Mathias Payer discovered that the USB audio driver for the
Linux kernel did not properly validate device meta data. A physically
proximate attacker could use this to cause a denial of service (system
crash). (CVE-2019-15117)

Hui Peng and Mathias Payer discovered that the USB audio driver for the
Linux kernel improperly performed recursion while handling device meta
data. A physically proximate attacker could use this to cause a denial of
service (system crash). (CVE-2019-15118)

It was discovered that the Technisat DVB-S/S2 USB device driver in the
Linux kernel contained a buffer overread. A physically proximate attacker
could use this to cause a denial of service (system crash) or possibly
expose sensitive information. (CVE-2019-15505)

Brad Spengler discovered that a Spectre mitigation was improperly
implemented in the ptrace susbsystem of the Linux kernel. A local attacker
could possibly use this to expose sensitive information. (CVE-2019-15902)

Update instructions:

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

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1056-aws      4.4.0-1056.60
  linux-image-4.4.0-166-generic   4.4.0-166.195~14.04.1
  linux-image-4.4.0-166-generic-lpae  4.4.0-166.195~14.04.1
  linux-image-4.4.0-166-lowlatency  4.4.0-166.195~14.04.1
  linux-image-4.4.0-166-powerpc-e500mc  4.4.0-166.195~14.04.1
  linux-image-4.4.0-166-powerpc-smp  4.4.0-166.195~14.04.1
  linux-image-4.4.0-166-powerpc64-emb  4.4.0-166.195~14.04.1
  linux-image-4.4.0-166-powerpc64-smp  4.4.0-166.195~14.04.1
  linux-image-aws                 4.4.0.1056.57
  linux-image-generic-lpae-lts-xenial  4.4.0.166.145
  linux-image-generic-lts-xenial  4.4.0.166.145
  linux-image-lowlatency-lts-xenial  4.4.0.166.145
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.166.145
  linux-image-powerpc-smp-lts-xenial  4.4.0.166.145
  linux-image-powerpc64-emb-lts-xenial  4.4.0.166.145
  linux-image-powerpc64-smp-lts-xenial  4.4.0.166.145
  linux-image-virtual-lts-xenial  4.4.0.166.145

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/4163-2
  https://usn.ubuntu.com/4163-1
  CVE-2016-10906, CVE-2017-18232, CVE-2018-21008, CVE-2019-14814,
  CVE-2019-14816, CVE-2019-14821, CVE-2019-15117, CVE-2019-15118,
  CVE-2019-15505, CVE-2019-15902


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