Ubuntu 18.04 LTS USN-4979-1 Critical Denial of Service Issues

ubuntu

June 2, 2021

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-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems

- linux-kvm: Linux kernel for cloud environments

- 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-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:

Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the

Linux kernel contained a reference counting error. A local attacker could

use this to cause a denial of service (system crash). (CVE-2020-25670)

Kiyin (尹亮) d...

Read the Full Advisory

Topics Covered

security advisory ubuntu system crash cloud security kernel denials

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1072-oracle  4.15.0-1072.80
  linux-image-4.15.0-1092-kvm     4.15.0-1092.94
  linux-image-4.15.0-1100-gcp     4.15.0-1100.113
  linux-image-4.15.0-1103-aws     4.15.0-1103.110
  linux-image-4.15.0-1103-snapdragon  4.15.0-1103.112
  linux-image-4.15.0-1115-azure   4.15.0-1115.128
  linux-image-4.15.0-144-generic  4.15.0-144.148
  linux-image-4.15.0-144-generic-lpae  4.15.0-144.148
  linux-image-4.15.0-144-lowlatency  4.15.0-144.148
  linux-image-aws-lts-18.04       4.15.0.1103.106
  linux-image-azure-lts-18.04     4.15.0.1115.88
  linux-image-gcp-lts-18.04       4.15.0.1100.118
  linux-image-generic             4.15.0.144.131
  linux-image-generic-lpae        4.15.0.144.131
  linux-image-kvm                 4.15.0.1092.88
  linux-image-lowlatency          4.15.0.144.131
  linux-image-oracle-lts-18.04    4.15.0.1072.82
  linux-image-snapdragon          4.15.0.1103.106
  linux-image-virtual             4.15.0.144.131

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1072-oracle  4.15.0-1072.80~16.04.1
  linux-image-4.15.0-1100-gcp     4.15.0-1100.113~16.04.1
  linux-image-4.15.0-1103-aws     4.15.0-1103.110~16.04.1
  linux-image-4.15.0-1115-azure   4.15.0-1115.128~16.04.1
  linux-image-4.15.0-144-generic  4.15.0-144.148~16.04.1
  linux-image-4.15.0-144-lowlatency  4.15.0-144.148~16.04.1
  linux-image-aws-hwe             4.15.0.1103.94
  linux-image-azure               4.15.0.1115.106
  linux-image-gcp                 4.15.0.1100.101
  linux-image-generic-hwe-16.04   4.15.0.144.140
  linux-image-gke                 4.15.0.1100.101
  linux-image-lowlatency-hwe-16.04  4.15.0.144.140
  linux-image-oem                 4.15.0.144.140
  linux-image-oracle              4.15.0.1072.60
  linux-image-virtual-hwe-16.04   4.15.0.144.140

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1115-azure   4.15.0-1115.128~14.04.1
  linux-image-azure               4.15.0.1115.88

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.