=========================================================================Ubuntu Security Notice USN-4363-1
May 18, 2020

linux, linux-aws, linux-aws-hwe, linux-gcp, linux-gke-4.15, linux-hwe,
linux-oem, linux-oracle, linux-snapdragon vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

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 options could use this to cause a denial
of service (system crash). (CVE-2020-11565)

David Gibson discovered that the Linux kernel on Power9 CPUs did not
properly save and restore Authority Mask registers state in some
situations. A local attacker in a guest VM could use this to cause a denial
of service (host system crash). (CVE-2020-11669)

It was discovered that the block layer in the Linux kernel contained a race
condition leading to a use-after-free vulnerability. A local attacker could
possibly use this to cause a denial of service (system crash) or execute
arbitrary code. (CVE-2020-12657)

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.

References:
  https://ubuntu.com/security/notices/USN-4363-1
  CVE-2020-11494, CVE-2020-11565, CVE-2020-11669, CVE-2020-12657

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-101.102
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1067.71
  https://launchpad.net/ubuntu/+source/linux-gke-4.15/4.15.0-1059.62
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1081.91
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1039.43
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1079.86
  https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1067.71~16.04.1
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1071.81~16.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-101.102~16.04.1
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1039.43~16.04.1

Ubuntu 4363-1: Linux kernel vulnerabilities

May 18, 2020
Several security issues were fixed in the Linux kernel.

Summary

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.

References

https://ubuntu.com/security/notices/USN-4363-1

CVE-2020-11494, CVE-2020-11565, CVE-2020-11669, CVE-2020-12657

Severity
May 18, 2020

Package Information

https://launchpad.net/ubuntu/+source/linux/4.15.0-101.102 https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1067.71 https://launchpad.net/ubuntu/+source/linux-gke-4.15/4.15.0-1059.62 https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1081.91 https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1039.43 https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1079.86 https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1067.71~16.04.1 https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1071.81~16.04.1 https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-101.102~16.04.1 https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1039.43~16.04.1

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