Ubuntu 18.04 LTS: USN-4184-1 Moderate: Kernel Security Issues

ubuntu

November 12, 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-aws: Linux kernel for Amazon Web Services (AWS) systems

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

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) 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-gke-5.0: Linux kernel for Google Container Engine (GKE) systems

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

- linux-oem-osp1: Linux kernel for OEM processors

Details:

Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo,

Kaveh Razavi, Herbert Bos, Cristiano Giuffrida, Giorgi Maisuradze, Moritz

Lipp, Michael Schwarz, Daniel Gruss, and Jo Van Bulck discovered that Intel

processors using Transactional Synchronization Extensions (TSX) could

expose memory contents previously stored in microarchi...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel ubuntu memory exposure intel permissions check

Update Instructions

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

Ubuntu 19.04:
  linux-image-5.0.0-1007-oracle   5.0.0-1007.12
  linux-image-5.0.0-1021-aws      5.0.0-1021.24
  linux-image-5.0.0-1022-kvm      5.0.0-1022.24
  linux-image-5.0.0-1022-raspi2   5.0.0-1022.23
  linux-image-5.0.0-1025-azure    5.0.0-1025.27
  linux-image-5.0.0-1025-gcp      5.0.0-1025.26
  linux-image-5.0.0-35-generic    5.0.0-35.38
  linux-image-5.0.0-35-generic-lpae  5.0.0-35.38
  linux-image-5.0.0-35-lowlatency  5.0.0-35.38
  linux-image-aws                 5.0.0.1021.23
  linux-image-azure               5.0.0.1025.25
  linux-image-gcp                 5.0.0.1025.50
  linux-image-generic             5.0.0.35.37
  linux-image-generic-lpae        5.0.0.35.37
  linux-image-gke                 5.0.0.1025.50
  linux-image-kvm                 5.0.0.1022.23
  linux-image-lowlatency          5.0.0.35.37
  linux-image-oracle              5.0.0.1007.33
  linux-image-raspi2              5.0.0.1022.20
  linux-image-virtual             5.0.0.35.37

Ubuntu 18.04 LTS:
  linux-image-5.0.0-1025-azure    5.0.0-1025.27~18.04.1
  linux-image-5.0.0-1025-gcp      5.0.0-1025.26~18.04.1
  linux-image-5.0.0-1025-gke      5.0.0-1025.26~18.04.1
  linux-image-5.0.0-1027-oem-osp1  5.0.0-1027.31
  linux-image-5.0.0-35-generic    5.0.0-35.38~18.04.1
  linux-image-5.0.0-35-generic-lpae  5.0.0-35.38~18.04.1
  linux-image-5.0.0-35-lowlatency  5.0.0-35.38~18.04.1
  linux-image-azure               5.0.0.1025.36
  linux-image-gcp                 5.0.0.1025.29
  linux-image-generic-hwe-18.04   5.0.0.35.93
  linux-image-generic-lpae-hwe-18.04  5.0.0.35.93
  linux-image-gke-5.0             5.0.0.1025.14
  linux-image-lowlatency-hwe-18.04  5.0.0.35.93
  linux-image-oem-osp1            5.0.0.1027.31
  linux-image-snapdragon-hwe-18.04  5.0.0.35.93
  linux-image-virtual-hwe-18.04   5.0.0.35.93

Please note that mitigating the TSX (CVE-2019-11135) and i915
(CVE-2019-0154) issues requires corresponding microcode and graphics
firmware updates respectively.

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.