Ubuntu 18.04 LTS USN-5515-1 Critical: Kernel Crash Threats

ubuntu

July 13, 2022

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 systems

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

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

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

Details:

Eric Biederman discovered that the cgroup process migration implementation

in the Linux kernel did not perform permission checks correctly in some

situations. A local attacker could possibly use this to gain administrative

privileges. (CVE-2021-4197)

Jann Horn discovered...

Read the Full Advisory

Topics Covered

security advisory denial of service local attack kernel issue ubuntu

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1102-oracle  4.15.0-1102.113
  linux-image-4.15.0-1115-raspi2  4.15.0-1115.123
  linux-image-4.15.0-1123-kvm     4.15.0-1123.128
  linux-image-4.15.0-1131-gcp     4.15.0-1131.147
  linux-image-4.15.0-1133-snapdragon  4.15.0-1133.143
  linux-image-4.15.0-1137-aws     4.15.0-1137.148
  linux-image-4.15.0-1146-azure   4.15.0-1146.161
  linux-image-4.15.0-189-generic  4.15.0-189.200
  linux-image-4.15.0-189-generic-lpae  4.15.0-189.200
  linux-image-4.15.0-189-lowlatency  4.15.0-189.200
  linux-image-aws-lts-18.04       4.15.0.1137.137
  linux-image-azure-lts-18.04     4.15.0.1146.116
  linux-image-gcp-lts-18.04       4.15.0.1131.147
  linux-image-generic             4.15.0.189.174
  linux-image-generic-lpae        4.15.0.189.174
  linux-image-kvm                 4.15.0.1123.116
  linux-image-lowlatency          4.15.0.189.174
  linux-image-oracle-lts-18.04    4.15.0.1102.109
  linux-image-raspi2              4.15.0.1115.112
  linux-image-snapdragon          4.15.0.1133.134
  linux-image-virtual             4.15.0.189.174

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1137-aws-hwe  4.15.0-1137.148~16.04.1
  linux-image-4.15.0-189-generic  4.15.0-189.200~16.04.1
  linux-image-4.15.0-189-lowlatency  4.15.0-189.200~16.04.1
  linux-image-aws-hwe             4.15.0.1137.124
  linux-image-generic-hwe-16.04   4.15.0.189.176
  linux-image-lowlatency-hwe-16.04  4.15.0.189.176
  linux-image-oem                 4.15.0.189.176
  linux-image-virtual-hwe-16.04   4.15.0.189.176

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1146-azure   4.15.0-1146.161~14.04.1
  linux-image-azure               4.15.0.1146.115

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.