1. Ubuntu Security Notices
  2. USN-4163-2

USN-4163-2: Linux kernel (Xenial HWE) vulnerabilities

Publication date

23 October 2019

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • 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...

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

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
14.04 trusty linux-image-powerpc-smp-lts-xenial –  4.4.0.166.145
linux-image-generic-lpae-lts-xenial –  4.4.0.166.145
linux-image-virtual-lts-xenial –  4.4.0.166.145
linux-image-4.4.0-1056-aws –  4.4.0-1056.60
linux-image-4.4.0-166-generic-lpae –  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-lowlatency-lts-xenial –  4.4.0.166.145
linux-image-powerpc64-smp-lts-xenial –  4.4.0.166.145
linux-image-4.4.0-166-powerpc64-emb –  4.4.0-166.195~14.04.1
linux-image-powerpc64-emb-lts-xenial –  4.4.0.166.145
linux-image-4.4.0-166-generic –  4.4.0-166.195~14.04.1
linux-image-generic-lts-xenial –  4.4.0.166.145
linux-image-aws –  4.4.0.1056.57
linux-image-4.4.0-166-lowlatency –  4.4.0-166.195~14.04.1
linux-image-powerpc-e500mc-lts-xenial –  4.4.0.166.145
linux-image-4.4.0-166-powerpc-smp –  4.4.0-166.195~14.04.1
linux-image-4.4.0-166-powerpc-e500mc –  4.4.0-166.195~14.04.1

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References

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