Ubuntu 18.04/16.04: USN-4144-1 Moderate: Kernel Denial Of Service Attacks

ubuntu

September 30, 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-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 dis...

Read the Full Advisory

Topics Covered

security advisory denial of service software fix kernel system update ubuntu XFS

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.