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Ubuntu 16.04 LTS USN-3777-2 Critical: Kernel Denial Of Service

ubuntu
Calendar Grey October 1, 2018
Dist Ubuntu Esm H88
Multiple significant vulnerabilities resolved in the Linux kernel for Ubuntu 16.04 as per USN-3777-2 advisory. Update strongly suggested.
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-3777-1 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.

Jann Horn discovered that the vmacache subsystem did not properly handle

sequence number overflows, leading to a use-after-free vulnerability. A

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

or execute arbitrary code. (CVE-2018-17182)

It was discovered that the paravirtualization implementation in the Linux

kernel did not properly handle some indirect calls, reducing the

effectiveness of Spectre v2 mitigations for paravirtual guests. A local

attacker could use this to expose sensitive information. (CVE-2018-15594)

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu kernel system crash mitigation

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1021-gcp     4.15.0-1021.22~16.04.1
  linux-image-4.15.0-36-generic   4.15.0-36.39~16.04.1
  linux-image-4.15.0-36-generic-lpae  4.15.0-36.39~16.04.1
  linux-image-4.15.0-36-lowlatency  4.15.0-36.39~16.04.1
  linux-image-gcp                 4.15.0.1021.35
  linux-image-generic-hwe-16.04   4.15.0.36.59
  linux-image-generic-lpae-hwe-16.04  4.15.0.36.59
  linux-image-gke                 4.15.0.1021.35
  linux-image-lowlatency-hwe-16.04  4.15.0.36.59
  linux-image-oem                 4.15.0.36.59

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-3777-2

https://ubuntu.com/security/notices/USN-3777-1

CVE-2018-10853, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594,

CVE-2018-17182, CVE-2018-6554, CVE-2018-6555

Severity
critical
Lowest
Low
Medium
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Critical

October 01, 2018

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu kernel system crash mitigation

Package Information

https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1021.22~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-36.39~16.04.1

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