Ubuntu: 5018-1 Critical: Kernel Security Threats and Denial of Service

ubuntu

July 20, 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-raspi2: Linux kernel for Raspberry Pi (V8) 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:

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

kernel contained an unsigned to signed integer conversion error. A local

attacker could use this to caus...

Read the Full Advisory

Topics Covered

security advisory denial of service security issue critical code execution Ubuntu kernel

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1078-oracle  4.15.0-1078.86
  linux-image-4.15.0-1092-raspi2  4.15.0-1092.98
  linux-image-4.15.0-1097-kvm     4.15.0-1097.99
  linux-image-4.15.0-1106-gcp     4.15.0-1106.120
  linux-image-4.15.0-1109-aws     4.15.0-1109.116
  linux-image-4.15.0-1109-snapdragon  4.15.0-1109.118
  linux-image-4.15.0-1121-azure   4.15.0-1121.134
  linux-image-4.15.0-151-generic  4.15.0-151.157
  linux-image-4.15.0-151-generic-lpae  4.15.0-151.157
  linux-image-4.15.0-151-lowlatency  4.15.0-151.157
  linux-image-aws-lts-18.04       4.15.0.1109.112
  linux-image-azure-lts-18.04     4.15.0.1121.94
  linux-image-gcp-lts-18.04       4.15.0.1106.125
  linux-image-generic             4.15.0.151.139
  linux-image-generic-lpae        4.15.0.151.139
  linux-image-kvm                 4.15.0.1097.93
  linux-image-lowlatency          4.15.0.151.139
  linux-image-oracle-lts-18.04    4.15.0.1078.88
  linux-image-raspi2              4.15.0.1092.90
  linux-image-snapdragon          4.15.0.1109.112
  linux-image-virtual             4.15.0.151.139

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1078-oracle  4.15.0-1078.86~16.04.1
  linux-image-4.15.0-1106-gcp     4.15.0-1106.120~16.04.1
  linux-image-4.15.0-1109-aws     4.15.0-1109.116~16.04.1
  linux-image-4.15.0-1121-azure   4.15.0-1121.134~16.04.1
  linux-image-4.15.0-151-generic  4.15.0-151.157~16.04.1
  linux-image-4.15.0-151-lowlatency  4.15.0-151.157~16.04.1
  linux-image-aws-hwe             4.15.0.1109.100
  linux-image-azure               4.15.0.1121.112
  linux-image-gcp                 4.15.0.1106.107
  linux-image-generic-hwe-16.04   4.15.0.151.146
  linux-image-gke                 4.15.0.1106.107
  linux-image-lowlatency-hwe-16.04  4.15.0.151.146
  linux-image-oem                 4.15.0.151.146
  linux-image-oracle              4.15.0.1078.66
  linux-image-virtual-hwe-16.04   4.15.0.151.146

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1121-azure   4.15.0-1121.134~14.04.1
  linux-image-azure               4.15.0.1121.94

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.