Ubuntu 20.04/21.04/21.10 USN-5208-1 Critical: Kernel Issues Fixed

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: Linux kernel for Microsoft Azure Cloud systems

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

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi: Linux kernel for Raspberry Pi systems

- linux-aws-5.11: Linux kernel for Amazon Web Services (AWS) systems

- linux-azure-5.11: Linux kernel for Microsoft Azure cloud systems

- linux-gcp-5.11: Linux kernel for Google Cloud Platform (GCP) systems

- linux-hwe-5.11: Linux hardware enablement (HWE) kernel

- linux-oracle-5.11: Linux kernel for Oracle Cloud systems

Details:

Nadav Amit discovered that the hugetlb implementation in the Linux kernel

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

could use this to leak or alter data from other processes that use h...

Read the Full Advisory

Topics Covered

security advisory denial of service critical kernel ubuntu data leak

Update Instructions

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

Ubuntu 21.10:
  linux-image-5.13.0-1007-kvm     5.13.0-1007.7
  linux-image-5.13.0-1008-aws     5.13.0-1008.9
  linux-image-5.13.0-1008-gcp     5.13.0-1008.9
  linux-image-5.13.0-1009-azure   5.13.0-1009.10
  linux-image-5.13.0-1011-oracle  5.13.0-1011.13
  linux-image-5.13.0-1012-raspi   5.13.0-1012.14
  linux-image-5.13.0-1012-raspi-nolpae  5.13.0-1012.14
  linux-image-5.13.0-23-generic   5.13.0-23.23
  linux-image-5.13.0-23-generic-64k  5.13.0-23.23
  linux-image-5.13.0-23-generic-lpae  5.13.0-23.23
  linux-image-5.13.0-23-lowlatency  5.13.0-23.23
  linux-image-aws                 5.13.0.1008.10
  linux-image-azure               5.13.0.1009.10
  linux-image-gcp                 5.13.0.1008.9
  linux-image-generic             5.13.0.23.34
  linux-image-generic-64k         5.13.0.23.34
  linux-image-generic-lpae        5.13.0.23.34
  linux-image-gke                 5.13.0.1008.9
  linux-image-kvm                 5.13.0.1007.7
  linux-image-lowlatency          5.13.0.23.34
  linux-image-oem-20.04           5.13.0.23.34
  linux-image-oracle              5.13.0.1011.13
  linux-image-raspi               5.13.0.1012.18
  linux-image-raspi-nolpae        5.13.0.1012.18
  linux-image-virtual             5.13.0.23.34

Ubuntu 21.04:
  linux-image-5.11.0-1021-kvm     5.11.0-1021.23
  linux-image-5.11.0-1023-aws     5.11.0-1023.24
  linux-image-5.11.0-1023-azure   5.11.0-1023.24
  linux-image-5.11.0-1023-oracle  5.11.0-1023.24
  linux-image-5.11.0-1024-gcp     5.11.0-1024.26
  linux-image-5.11.0-1024-raspi   5.11.0-1024.26
  linux-image-5.11.0-1024-raspi-nolpae  5.11.0-1024.26
  linux-image-5.11.0-44-generic   5.11.0-44.48
  linux-image-5.11.0-44-generic-64k  5.11.0-44.48
  linux-image-5.11.0-44-generic-lpae  5.11.0-44.48
  linux-image-5.11.0-44-lowlatency  5.11.0-44.48
  linux-image-aws                 5.11.0.1023.24
  linux-image-azure               5.11.0.1023.24
  linux-image-gcp                 5.11.0.1024.24
  linux-image-generic             5.11.0.44.44
  linux-image-generic-64k         5.11.0.44.44
  linux-image-generic-lpae        5.11.0.44.44
  linux-image-gke                 5.11.0.1024.24
  linux-image-kvm                 5.11.0.1021.22
  linux-image-lowlatency          5.11.0.44.44
  linux-image-oem-20.04           5.11.0.44.44
  linux-image-oracle              5.11.0.1023.24
  linux-image-raspi               5.11.0.1024.22
  linux-image-raspi-nolpae        5.11.0.1024.22
  linux-image-virtual             5.11.0.44.44

Ubuntu 20.04 LTS:
  linux-image-5.11.0-1023-aws     5.11.0-1023.24~20.04.1
  linux-image-5.11.0-1023-azure   5.11.0-1023.24~20.04.1
  linux-image-5.11.0-1023-oracle  5.11.0-1023.24~20.04.1
  linux-image-5.11.0-1024-gcp     5.11.0-1024.26~20.04.1
  linux-image-5.11.0-44-generic   5.11.0-44.48~20.04.2
  linux-image-5.11.0-44-generic-64k  5.11.0-44.48~20.04.2
  linux-image-5.11.0-44-generic-lpae  5.11.0-44.48~20.04.2
  linux-image-5.11.0-44-lowlatency  5.11.0-44.48~20.04.2
  linux-image-aws                 5.11.0.1023.24~20.04.23
  linux-image-azure               5.11.0.1023.24~20.04.23
  linux-image-gcp                 5.11.0.1024.26~20.04.24
  linux-image-generic-64k-hwe-20.04  5.11.0.44.48~20.04.22
  linux-image-generic-hwe-20.04   5.11.0.44.48~20.04.22
  linux-image-generic-lpae-hwe-20.04  5.11.0.44.48~20.04.22
  linux-image-lowlatency-hwe-20.04  5.11.0.44.48~20.04.22
  linux-image-oracle              5.11.0.1023.24~20.04.16
  linux-image-virtual-hwe-20.04   5.11.0.44.48~20.04.22

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.