Ubuntu 18.04 LTS: USN-4390-1 Severe: Linux Kernel Denial of Service

ubuntu

June 9, 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-azure-4.15: Linux kernel for Microsoft Azure Cloud systems

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

- linux-kvm: Linux kernel for cloud environments

- linux-oem: Linux kernel for OEM systems

- linux-oracle: Linux kernel for Oracle Cloud systems

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

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

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

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

Details:

It was discovered that the F2FS file system implementation in the Linux

kernel did not properly perform bounds checking on xattrs in some

situations. A local attacker could possibly use this to expose sensitive

information (kernel memory). (CVE-2020-0067)

It was discovered that mem...

Read the Full Advisory

Topics Covered

security advisory denial of service Ubuntu system crash linux kernel

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1045-oracle  4.15.0-1045.49
  linux-image-4.15.0-106-generic  4.15.0-106.107
  linux-image-4.15.0-106-generic-lpae  4.15.0-106.107
  linux-image-4.15.0-106-lowlatency  4.15.0-106.107
  linux-image-4.15.0-1063-gke     4.15.0-1063.66
  linux-image-4.15.0-1067-kvm     4.15.0-1067.68
  linux-image-4.15.0-1073-aws     4.15.0-1073.77
  linux-image-4.15.0-1087-oem     4.15.0-1087.97
  linux-image-4.15.0-1089-azure   4.15.0-1089.99
  linux-image-aws-lts-18.04       4.15.0.1073.76
  linux-image-azure-lts-18.04     4.15.0.1089.60
  linux-image-generic             4.15.0.106.94
  linux-image-generic-lpae        4.15.0.106.94
  linux-image-gke                 4.15.0.1063.65
  linux-image-gke-4.15            4.15.0.1063.65
  linux-image-kvm                 4.15.0.1067.63
  linux-image-lowlatency          4.15.0.106.94
  linux-image-oem                 4.15.0.1087.91
  linux-image-oracle-lts-18.04    4.15.0.1045.54
  linux-image-powerpc-e500mc      4.15.0.106.94
  linux-image-powerpc-smp         4.15.0.106.94
  linux-image-powerpc64-emb       4.15.0.106.94
  linux-image-powerpc64-smp       4.15.0.106.94
  linux-image-virtual             4.15.0.106.94

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1045-oracle  4.15.0-1045.49~16.04.1
  linux-image-4.15.0-106-generic  4.15.0-106.107~16.04.1
  linux-image-4.15.0-106-generic-lpae  4.15.0-106.107~16.04.1
  linux-image-4.15.0-106-lowlatency  4.15.0-106.107~16.04.1
  linux-image-4.15.0-1073-aws     4.15.0-1073.77~16.04.1
  linux-image-4.15.0-1077-gcp     4.15.0-1077.87~16.04.1
  linux-image-4.15.0-1089-azure   4.15.0-1089.99~16.04.1
  linux-image-aws-hwe             4.15.0.1073.73
  linux-image-azure               4.15.0.1089.84
  linux-image-azure-edge          4.15.0.1089.84
  linux-image-gcp                 4.15.0.1077.79
  linux-image-generic-hwe-16.04   4.15.0.106.111
  linux-image-generic-lpae-hwe-16.04  4.15.0.106.111
  linux-image-gke                 4.15.0.1077.79
  linux-image-lowlatency-hwe-16.04  4.15.0.106.111
  linux-image-oem                 4.15.0.106.111
  linux-image-oracle              4.15.0.1045.38
  linux-image-virtual-hwe-16.04   4.15.0.106.111

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1089-azure   4.15.0-1089.99~14.04.1
  linux-image-azure               4.15.0.1089.66

Please note that the mitigation for CVE-2020-0543 requires a processor
microcode update to be applied, either from your system manufacturer
or via the intel-microcode package. The kernel update for this
issue provides the ability to disable the mitigation and to report
vulnerability status.

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.