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Ubuntu 16.04 LTS Security Advisory: USN-4068-2 Critical Kernel Issues

ubuntu
Calendar Grey July 23, 2019
Dist Ubuntu Esm H88
=========================================================================Ubuntu Security Notice USN-
Several security issues were fixed in the Linux kernel.

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

Details:

USN-4068-1 fixed vulnerabilities in the Linux kernel for Ubuntu

18.04 LTS. This update provides the corresponding updates for the

Linux Hardware Enablement (HWE) kernel from Ubuntu 18.04 for Ubuntu

16.04 LTS.

Adam Zabrocki discovered that the Intel i915 kernel mode graphics driver in

the Linux kernel did not properly restrict mmap() ranges in some

situations. A local attacker could use this to cause a denial of service

(system crash) or possibly execute arbitrary code. (CVE-2019-11085)

It was discovered that a race condition leading to a use-after-free existed

in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux

kernel. The RDS protocol is blacklisted by default in Ubuntu. If enabled, a

local attacker could use this to cause a denial of service (system ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service arbitrary code execution system update ubuntu linux kernel

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1037-gcp     4.15.0-1037.39~16.04.1
  linux-image-4.15.0-55-generic   4.15.0-55.60~16.04.2
  linux-image-4.15.0-55-generic-lpae  4.15.0-55.60~16.04.2
  linux-image-4.15.0-55-lowlatency  4.15.0-55.60~16.04.2
  linux-image-gcp                 4.15.0.1037.51
  linux-image-generic-hwe-16.04   4.15.0.55.76
  linux-image-generic-lpae-hwe-16.04  4.15.0.55.76
  linux-image-gke                 4.15.0.1037.51
  linux-image-lowlatency-hwe-16.04  4.15.0.55.76
  linux-image-oem                 4.15.0.55.76
  linux-image-virtual-hwe-16.04   4.15.0.55.76

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://ubuntu.com/security/notices/USN-4068-2

https://ubuntu.com/security/notices/USN-4068-1

CVE-2019-11085, CVE-2019-11815, CVE-2019-11833, CVE-2019-11884

Severity
critical
Lowest
Low
Medium
High
Critical

July 23, 2019

Topics%20covered

Topics Covered

security advisory denial of service arbitrary code execution system update ubuntu linux kernel

Package Information

https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1037.39~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-55.60~16.04.2

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