Ubuntu 18.04 LTS: USN-4363-1 Significant Kernel Fixes for Security

ubuntu

May 18, 2020

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

- linux-oem: Linux kernel for OEM systems

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems

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

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

Details:

It was discovered that the Serial CAN interface driver in the Linux kernel

did not properly initialize data. A local attacker could use this to expose

sensitive information (kernel memory). (CVE-2020-11494)

It was discovered that the linux kernel did not properly validate certain

mount options to the tmpfs virtual memory file system. A local attacker

with the ability to specify mount option...

Read the Full Advisory

Topics Covered

security advisory DoS Ubuntu kernel local attack information exposure system crash

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-101-generic  4.15.0-101.102
  linux-image-4.15.0-101-generic-lpae  4.15.0-101.102
  linux-image-4.15.0-101-lowlatency  4.15.0-101.102
  linux-image-4.15.0-1039-oracle  4.15.0-1039.43
  linux-image-4.15.0-1059-gke     4.15.0-1059.62
  linux-image-4.15.0-1067-aws     4.15.0-1067.71
  linux-image-4.15.0-1079-snapdragon  4.15.0-1079.86
  linux-image-4.15.0-1081-oem     4.15.0-1081.91
  linux-image-aws-lts-18.04       4.15.0.1067.70
  linux-image-generic             4.15.0.101.91
  linux-image-generic-lpae        4.15.0.101.91
  linux-image-gke                 4.15.0.1059.63
  linux-image-gke-4.15            4.15.0.1059.63
  linux-image-lowlatency          4.15.0.101.91
  linux-image-oem                 4.15.0.1081.85
  linux-image-oracle-lts-18.04    4.15.0.1039.48
  linux-image-powerpc-e500mc      4.15.0.101.91
  linux-image-powerpc-smp         4.15.0.101.91
  linux-image-powerpc64-emb       4.15.0.101.91
  linux-image-powerpc64-smp       4.15.0.101.91
  linux-image-snapdragon          4.15.0.1079.82
  linux-image-virtual             4.15.0.101.91

Ubuntu 16.04 LTS:
  linux-image-4.15.0-101-generic  4.15.0-101.102~16.04.1
  linux-image-4.15.0-101-generic-lpae  4.15.0-101.102~16.04.1
  linux-image-4.15.0-101-lowlatency  4.15.0-101.102~16.04.1
  linux-image-4.15.0-1039-oracle  4.15.0-1039.43~16.04.1
  linux-image-4.15.0-1067-aws     4.15.0-1067.71~16.04.1
  linux-image-4.15.0-1071-gcp     4.15.0-1071.81~16.04.1
  linux-image-aws-hwe             4.15.0.1067.67
  linux-image-gcp                 4.15.0.1071.77
  linux-image-generic-hwe-16.04   4.15.0.101.108
  linux-image-generic-lpae-hwe-16.04  4.15.0.101.108
  linux-image-gke                 4.15.0.1071.77
  linux-image-lowlatency-hwe-16.04  4.15.0.101.108
  linux-image-oem                 4.15.0.101.108
  linux-image-oracle              4.15.0.1039.32
  linux-image-virtual-hwe-16.04   4.15.0.101.108

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.