=========================================================================
Ubuntu Security Notice USN-4144-1
October 01, 2019

linux, linux-aws, linux-aws-hwe, linux-azure, linux-hwe, linux-kvm,
linux-oem, linux-oracle, linux-raspi2, 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-kvm: Linux kernel for cloud environments
- linux-oem: Linux kernel for OEM processors
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon processors
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the XFS file system in the Linux kernel did not
properly handle mount failures in some situations. A local attacker could
possibly use this to cause a denial of service (system crash) or execute
arbitrary code. (CVE-2018-20976)

Benjamin Moody discovered that the XFS file system in the Linux kernel did
not properly handle an error condition when out of disk quota. A local
attacker could possibly use this to cause a denial of service.
(CVE-2019-15538)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1026-oracle  4.15.0-1026.29
  linux-image-4.15.0-1047-kvm     4.15.0-1047.47
  linux-image-4.15.0-1048-raspi2  4.15.0-1048.52
  linux-image-4.15.0-1051-aws     4.15.0-1051.53
  linux-image-4.15.0-1057-oem     4.15.0-1057.66
  linux-image-4.15.0-1065-snapdragon  4.15.0-1065.72
  linux-image-4.15.0-65-generic   4.15.0-65.74
  linux-image-4.15.0-65-generic-lpae  4.15.0-65.74
  linux-image-4.15.0-65-lowlatency  4.15.0-65.74
  linux-image-aws                 4.15.0.1051.50
  linux-image-generic             4.15.0.65.67
  linux-image-generic-lpae        4.15.0.65.67
  linux-image-kvm                 4.15.0.1047.47
  linux-image-lowlatency          4.15.0.65.67
  linux-image-oem                 4.15.0.1057.61
  linux-image-oracle              4.15.0.1026.29
  linux-image-powerpc-e500mc      4.15.0.65.67
  linux-image-powerpc-smp         4.15.0.65.67
  linux-image-powerpc64-emb       4.15.0.65.67
  linux-image-powerpc64-smp       4.15.0.65.67
  linux-image-raspi2              4.15.0.1048.46
  linux-image-snapdragon          4.15.0.1065.68
  linux-image-virtual             4.15.0.65.67

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1026-oracle  4.15.0-1026.29~16.04.1
  linux-image-4.15.0-1051-aws     4.15.0-1051.53~16.04.1
  linux-image-4.15.0-1060-azure   4.15.0-1060.65
  linux-image-4.15.0-65-generic   4.15.0-65.74~16.04.1
  linux-image-4.15.0-65-generic-lpae  4.15.0-65.74~16.04.1
  linux-image-4.15.0-65-lowlatency  4.15.0-65.74~16.04.1
  linux-image-aws-hwe             4.15.0.1051.51
  linux-image-azure               4.15.0.1060.63
  linux-image-generic-hwe-16.04   4.15.0.65.85
  linux-image-generic-lpae-hwe-16.04  4.15.0.65.85
  linux-image-lowlatency-hwe-16.04  4.15.0.65.85
  linux-image-oem                 4.15.0.65.85
  linux-image-oracle              4.15.0.1026.19
  linux-image-virtual-hwe-16.04   4.15.0.65.85

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://usn.ubuntu.com/4144-1
  CVE-2018-20976, CVE-2019-15538

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-65.74
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1051.53
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1047.47
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1057.66
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1026.29
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1048.52
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1065.72
  https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1051.53~16.04.1
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1060.65
  https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-65.74~16.04.1
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1026.29~16.04.1