Ubuntu 18.04 LTS: USN-4115-1 Critical: Multiple Kernel Exploits

ubuntu

September 2, 2019

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-gke-4.15: Linux kernel for Google Container Engine (GKE) systems

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi2: Linux kernel for Raspberry Pi 2

- 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:

Hui Peng and Mathias Payer discovered that the Option USB High Speed driver

in the Linux kernel did not properly validate metadata received from the

device. A physically proximate attacker could use this to cause a denial of

service (system crash). (CVE-2018-19985)

Zhipeng Xie discovered that an infinite loop could triggered in the CFS

Linux kernel process scheduler. A local attacker could possibly use this to

cause a denial of service. (CVE-2018-20784)

It was discovered th...

Read the Full Advisory

Topics Covered

security advisory denial of service Ubuntu kernel input validation system crash protocol exploitation

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1022-oracle  4.15.0-1022.25
  linux-image-4.15.0-1041-gke     4.15.0-1041.43
  linux-image-4.15.0-1043-kvm     4.15.0-1043.43
  linux-image-4.15.0-1044-raspi2  4.15.0-1044.47
  linux-image-4.15.0-60-generic   4.15.0-60.67
  linux-image-4.15.0-60-generic-lpae  4.15.0-60.67
  linux-image-4.15.0-60-lowlatency  4.15.0-60.67
  linux-image-generic             4.15.0.60.62
  linux-image-generic-lpae        4.15.0.60.62
  linux-image-gke                 4.15.0.1041.44
  linux-image-gke-4.15            4.15.0.1041.44
  linux-image-kvm                 4.15.0.1043.43
  linux-image-lowlatency          4.15.0.60.62
  linux-image-oracle              4.15.0.1022.25
  linux-image-powerpc-e500mc      4.15.0.60.62
  linux-image-powerpc-smp         4.15.0.60.62
  linux-image-powerpc64-emb       4.15.0.60.62
  linux-image-powerpc64-smp       4.15.0.60.62
  linux-image-raspi2              4.15.0.1044.42
  linux-image-virtual             4.15.0.60.62

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1022-oracle  4.15.0-1022.25~16.04.1
  linux-image-4.15.0-1041-gcp     4.15.0-1041.43
  linux-image-4.15.0-1056-azure   4.15.0-1056.61
  linux-image-4.15.0-60-generic   4.15.0-60.67~16.04.1
  linux-image-4.15.0-60-generic-lpae  4.15.0-60.67~16.04.1
  linux-image-4.15.0-60-lowlatency  4.15.0-60.67~16.04.1
  linux-image-azure               4.15.0.1056.59
  linux-image-gcp                 4.15.0.1041.55
  linux-image-generic-hwe-16.04   4.15.0.60.81
  linux-image-generic-lpae-hwe-16.04  4.15.0.60.81
  linux-image-gke                 4.15.0.1041.55
  linux-image-lowlatency-hwe-16.04  4.15.0.60.81
  linux-image-oem                 4.15.0.60.81
  linux-image-oracle              4.15.0.1022.16
  linux-image-virtual-hwe-16.04   4.15.0.60.81

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.