USN-4163-1: Linux kernel vulnerabilities

linux, linux-aws, 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-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 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 16.04 LTS: linux-image-4.4.0-1060-kvm – 4.4.0-1060.67; linux-image-4.4.0-1096-aws – 4.4.0-1096.107; linux-image-4.4.0-1124-raspi2 – 4.4.0-1124.133; linux-image-4.4.0-1128-snapdragon – 4.4.0-1128.136; linux-image-4.4.0-166-generic – 4.4.0-166.195; linux-image-4.4.0-166-generic-lpae – 4.4.0-166.195; linux-image-4.4.0-166-lowlatency – 4.4.0-166.195; linux-image-4.4.0-166-powerpc-e500mc – 4.4.0-166.195; linux-image-4.4.0-166-powerpc-smp – 4.4.0-166.195; linux-image-4.4.0-166-powerpc64-emb – 4.4.0-166.195; linux-image-4.4.0-166-powerpc64-smp – 4.4.0-166.195; linux-image-aws – 4.4.0.1096.100; linux-image-generic – 4.4.0.166.174; linux-image-generic-lpae – 4.4.0.166.174; linux-image-kvm – 4.4.0.1060.60; linux-image-lowlatency – 4.4.0.166.174; linux-image-powerpc-e500mc – 4.4.0.166.174; linux-image-powerpc-smp – 4.4.0.166.174; linux-image-powerpc64-emb – 4.4.0.166.174; linux-image-powerpc64-smp – 4.4.0.166.174; linux-image-raspi2 – 4.4.0.1124.124; linux-image-snapdragon – 4.4.0.1128.120; linux-image-virtual – 4.4.0.166.174

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

Source: USN-4163-1: Linux kernel vulnerabilities

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