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Ubuntu 16.04 LTS USN-3677-2 Critical: Linux Kernel Denial Of Service

ubuntu
Calendar Grey June 12, 2018
Dist Ubuntu Esm H88
Numerous vulnerabilities addressed in the Linux kernel for Ubuntu 20.04, improving total system reliability and efficiency.
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

- linux-oem: Linux kernel for OEM processors

Details:

USN-3677-1 fixed vulnerabilities in the Linux kernel for Ubuntu 17.10.

This update provides the corresponding updates for the Linux Hardware

Enablement (HWE) kernel from Ubuntu 17.10 for Ubuntu 16.04 LTS.

It was discovered that the netfilter subsystem of the Linux kernel did not

properly validate ebtables offsets. A local attacker could use this to

cause a denial of service (system crash) or possibly execute arbitrary

code. (CVE-2018-1068)

Wen Xu discovered that the ext4 filesystem implementation in the Linux

kernel did not properly handle corrupted meta data in some situations. An

attacker could use this to specially craft an ext4 file system that caused

a denial of service (system crash) when mounted. (CVE-2018-1092)

It was disco...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service update critical ubuntu linux kernel linux-gcp

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.13.0-1019-gcp     4.13.0-1019.23
  linux-image-4.13.0-1030-oem     4.13.0-1030.33
  linux-image-4.13.0-45-generic   4.13.0-45.50~16.04.1
  linux-image-4.13.0-45-generic-lpae  4.13.0-45.50~16.04.1
  linux-image-4.13.0-45-lowlatency  4.13.0-45.50~16.04.1
  linux-image-gcp                 4.13.0.1019.21
  linux-image-generic-hwe-16.04   4.13.0.45.64
  linux-image-generic-lpae-hwe-16.04  4.13.0.45.64
  linux-image-gke                 4.13.0.1019.21
  linux-image-lowlatency-hwe-16.04  4.13.0.45.64
  linux-image-oem                 4.13.0.1030.35

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-3677-2

https://ubuntu.com/security/notices/USN-3677-1

CVE-2018-1068, CVE-2018-1092, CVE-2018-7492, CVE-2018-8087,

CVE-2018-8781

Severity
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June 12, 2018

Topics%20covered

Topics Covered

security advisory denial of service update critical ubuntu linux kernel linux-gcp

Package Information

https://launchpad.net/ubuntu/+source/linux-gcp/4.13.0-1019.23
https://launchpad.net/ubuntu/+source/linux-hwe/4.13.0-45.50~16.04.1
https://launchpad.net/ubuntu/+source/linux-oem/4.13.0-1030.33

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