Ubuntu 18.04 LTS: USN-5209-1 High: Kernel Issues Affecting Security

ubuntu

January 5, 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-dell300x: Linux kernel for Dell 300x platforms

- 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-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:

Nadav Amit discovered that the hugetlb implementation in the Linux kernel

did not perform TLB flushes under certain conditions. A local attacker

could ...

Read the Full Advisory

Topics Covered

security advisory denial of service security issue kernel high ubuntu local attacker

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1033-dell300x  4.15.0-1033.38
  linux-image-4.15.0-1085-oracle  4.15.0-1085.93
  linux-image-4.15.0-1101-raspi2  4.15.0-1101.108
  linux-image-4.15.0-1105-kvm     4.15.0-1105.107
  linux-image-4.15.0-1114-gcp     4.15.0-1114.128
  linux-image-4.15.0-1118-aws     4.15.0-1118.125
  linux-image-4.15.0-1118-snapdragon  4.15.0-1118.127
  linux-image-4.15.0-1129-azure   4.15.0-1129.142
  linux-image-4.15.0-166-generic  4.15.0-166.174
  linux-image-4.15.0-166-generic-lpae  4.15.0-166.174
  linux-image-4.15.0-166-lowlatency  4.15.0-166.174
  linux-image-aws-lts-18.04       4.15.0.1118.121
  linux-image-azure-lts-18.04     4.15.0.1129.102
  linux-image-dell300x            4.15.0.1033.35
  linux-image-gcp-lts-18.04       4.15.0.1114.133
  linux-image-generic             4.15.0.166.155
  linux-image-generic-lpae        4.15.0.166.155
  linux-image-kvm                 4.15.0.1105.101
  linux-image-lowlatency          4.15.0.166.155
  linux-image-oracle-lts-18.04    4.15.0.1085.95
  linux-image-raspi2              4.15.0.1101.99
  linux-image-snapdragon          4.15.0.1118.121
  linux-image-virtual             4.15.0.166.155

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1085-oracle  4.15.0-1085.93~16.04.1
  linux-image-4.15.0-1114-gcp     4.15.0-1114.128~16.04.1
  linux-image-4.15.0-1118-aws     4.15.0-1118.125~16.04.1
  linux-image-4.15.0-1129-azure   4.15.0-1129.142~16.04.1
  linux-image-4.15.0-166-generic  4.15.0-166.174~16.04.1
  linux-image-4.15.0-166-lowlatency  4.15.0-166.174~16.04.1
  linux-image-aws-hwe             4.15.0.1118.108
  linux-image-azure               4.15.0.1129.120
  linux-image-gcp                 4.15.0.1114.115
  linux-image-generic-hwe-16.04   4.15.0.166.158
  linux-image-gke                 4.15.0.1114.115
  linux-image-lowlatency-hwe-16.04  4.15.0.166.158
  linux-image-oem                 4.15.0.166.158
  linux-image-oracle              4.15.0.1085.73
  linux-image-virtual-hwe-16.04   4.15.0.166.158

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1129-azure   4.15.0-1129.142~14.04.1
  linux-image-azure               4.15.0.1129.102

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.