Ubuntu 18.04 LTS USN-3752-1 Critical: Kernel Security Flaws

ubuntu

August 24, 2018

Several security issues were fixed in the Linux kernel.

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

- linux-kvm: Linux kernel for cloud environments

- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

It was discovered that, when attempting to handle an out-of-memory

situation, a null pointer dereference could be triggered in the Linux

kernel in some circumstances. A local attacker could use this to cause a

denial of service (system crash). (CVE-2018-1000200)

Wen Xu discovered that the XFS filesystem implementation in the Linux

kernel did not properly validate meta-data information. An attacker could

use this to construct a malicious xfs image that, when mounted, could cause

a denial of service (system crash). (CVE-2018-10323)

Wen Xu discovered that the XFS filesystem implementation in the Linux

kernel did not properly validate xattr informatio...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel update critical system update ubuntu linux kernel

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1018-gcp     4.15.0-1018.19
  linux-image-4.15.0-1020-aws     4.15.0-1020.20
  linux-image-4.15.0-1020-kvm     4.15.0-1020.20
  linux-image-4.15.0-1021-raspi2  4.15.0-1021.23
  linux-image-4.15.0-33-generic   4.15.0-33.36
  linux-image-4.15.0-33-generic-lpae  4.15.0-33.36
  linux-image-4.15.0-33-lowlatency  4.15.0-33.36
  linux-image-4.15.0-33-snapdragon  4.15.0-33.36
  linux-image-aws                 4.15.0.1020.20
  linux-image-gcp                 4.15.0.1018.20
  linux-image-generic             4.15.0.33.35
  linux-image-generic-lpae        4.15.0.33.35
  linux-image-gke                 4.15.0.1018.20
  linux-image-kvm                 4.15.0.1020.20
  linux-image-lowlatency          4.15.0.33.35
  linux-image-raspi2              4.15.0.1021.19
  linux-image-snapdragon          4.15.0.33.35

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.