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Ubuntu 16.04 LTS USN-3762-2 Critical Security Notice: Kernel Leak

ubuntu
Calendar Grey September 11, 2018
Dist Ubuntu Esm H88
Ubuntu 16.04 LTS encounters significant vulnerabilities within the HWE kernel; patching instructions released.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-3762-1 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 LTS for Ubuntu

16.04 LTS.

It was discovered that the VirtIO subsystem in the Linux kernel did not

properly initialize memory in some situations. A local attacker could use

this to possibly expose sensitive information (kernel memory).

(CVE-2018-1118)

Seunghun Han discovered an information leak in the ACPI handling code in

the Linux kernel when handling early termination of ACPI table loading. A

local attacker could use this to expose sensitive informal (kernel address

locations). (CVE-2017-13695)

Topics%20covered

Topics Covered

security advisory information leak critical Ubuntu kernel

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1019-gcp     4.15.0-1019.20~16.04.1
  linux-image-4.15.0-1023-azure   4.15.0-1023.24~16.04.1
  linux-image-4.15.0-34-generic   4.15.0-34.37~16.04.1
  linux-image-4.15.0-34-generic-lpae  4.15.0-34.37~16.04.1
  linux-image-4.15.0-34-lowlatency  4.15.0-34.37~16.04.1
  linux-image-azure               4.15.0.1023.29
  linux-image-gcp                 4.15.0.1019.33
  linux-image-generic-hwe-16.04   4.15.0.34.56
  linux-image-generic-lpae-hwe-16.04  4.15.0.34.56
  linux-image-gke                 4.15.0.1019.33
  linux-image-lowlatency-hwe-16.04  4.15.0.34.56

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-3762-2

https://ubuntu.com/security/notices/USN-3762-1

CVE-2017-13695, CVE-2018-1118

Severity
critical
Lowest
Low
Medium
High
Critical

September 11, 2018

Topics%20covered

Topics Covered

security advisory information leak critical Ubuntu kernel

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1023.24~16.04.1
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1019.20~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-34.37~16.04.1

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