==========================================================================
Ubuntu Security Notice USN-4694-1
January 14, 2021

linux, linux-hwe, linux-hwe-5.4, linux-hwe-5.8, linux-lts-xenial
vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 ESM

Summary:

The system could allow unintended access to data in some environments.

Software Description:
- linux: Linux kernel
- linux-hwe-5.8: Linux hardware enablement (HWE) kernel
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

It was discovered that the LIO SCSI target implementation in the Linux
kernel performed insufficient identifier checking in certain XCOPY
requests. An attacker with access to at least one LUN in a multiple
backstore environment could use this to expose sensitive information or
modify data.

Update instructions:

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

Ubuntu 20.10:
  linux-image-5.8.0-38-generic    5.8.0-38.43
  linux-image-5.8.0-38-generic-64k  5.8.0-38.43
  linux-image-5.8.0-38-generic-lpae  5.8.0-38.43
  linux-image-5.8.0-38-lowlatency  5.8.0-38.43
  linux-image-generic             5.8.0.38.42
  linux-image-generic-64k         5.8.0.38.42
  linux-image-generic-lpae        5.8.0.38.42
  linux-image-lowlatency          5.8.0.38.42
  linux-image-virtual             5.8.0.38.42

Ubuntu 20.04 LTS:
  linux-image-5.4.0-62-generic    5.4.0-62.70
  linux-image-5.4.0-62-generic-lpae  5.4.0-62.70
  linux-image-5.4.0-62-lowlatency  5.4.0-62.70
  linux-image-5.8.0-38-generic    5.8.0-38.43~20.04.1
  linux-image-5.8.0-38-generic-lpae  5.8.0-38.43~20.04.1
  linux-image-5.8.0-38-lowlatency  5.8.0-38.43~20.04.1
  linux-image-generic             5.4.0.62.65
  linux-image-generic-hwe-20.04   5.8.0.38.43~20.04.23
  linux-image-generic-lpae        5.4.0.62.65
  linux-image-generic-lpae-hwe-20.04  5.8.0.38.43~20.04.23
  linux-image-lowlatency          5.4.0.62.65
  linux-image-lowlatency-hwe-20.04  5.8.0.38.43~20.04.23
  linux-image-oem                 5.4.0.62.65
  linux-image-oem-osp1            5.4.0.62.65
  linux-image-virtual             5.4.0.62.65
  linux-image-virtual-hwe-20.04   5.8.0.38.43~20.04.23

Ubuntu 18.04 LTS:
  linux-image-4.15.0-132-generic  4.15.0-132.136
  linux-image-4.15.0-132-generic-lpae  4.15.0-132.136
  linux-image-4.15.0-132-lowlatency  4.15.0-132.136
  linux-image-5.4.0-62-generic    5.4.0-62.70~18.04.1
  linux-image-5.4.0-62-generic-lpae  5.4.0-62.70~18.04.1
  linux-image-5.4.0-62-lowlatency  5.4.0-62.70~18.04.1
  linux-image-generic             4.15.0.132.119
  linux-image-generic-hwe-18.04   5.4.0.62.70~18.04.57
  linux-image-generic-lpae        4.15.0.132.119
  linux-image-generic-lpae-hwe-18.04  5.4.0.62.70~18.04.57
  linux-image-lowlatency          4.15.0.132.119
  linux-image-lowlatency-hwe-18.04  5.4.0.62.70~18.04.57
  linux-image-oem                 5.4.0.62.70~18.04.57
  linux-image-oem-osp1            5.4.0.62.70~18.04.57
  linux-image-powerpc-e500mc      4.15.0.132.119
  linux-image-powerpc-smp         4.15.0.132.119
  linux-image-powerpc64-emb       4.15.0.132.119
  linux-image-powerpc64-smp       4.15.0.132.119
  linux-image-snapdragon-hwe-18.04  5.4.0.62.70~18.04.57
  linux-image-virtual             4.15.0.132.119
  linux-image-virtual-hwe-18.04   5.4.0.62.70~18.04.57

Ubuntu 16.04 LTS:
  linux-image-4.15.0-132-generic  4.15.0-132.136~16.04.1
  linux-image-4.15.0-132-generic-lpae  4.15.0-132.136~16.04.1
  linux-image-4.15.0-132-lowlatency  4.15.0-132.136~16.04.1
  linux-image-4.4.0-200-generic   4.4.0-200.232
  linux-image-4.4.0-200-generic-lpae  4.4.0-200.232
  linux-image-4.4.0-200-lowlatency  4.4.0-200.232
  linux-image-4.4.0-200-powerpc-e500mc  4.4.0-200.232
  linux-image-4.4.0-200-powerpc-smp  4.4.0-200.232
  linux-image-4.4.0-200-powerpc64-emb  4.4.0-200.232
  linux-image-4.4.0-200-powerpc64-smp  4.4.0-200.232
  linux-image-generic             4.4.0.200.206
  linux-image-generic-hwe-16.04   4.15.0.132.130
  linux-image-generic-lpae        4.4.0.200.206
  linux-image-generic-lpae-hwe-16.04  4.15.0.132.130
  linux-image-lowlatency          4.4.0.200.206
  linux-image-lowlatency-hwe-16.04  4.15.0.132.130
  linux-image-oem                 4.15.0.132.130
  linux-image-powerpc-e500mc      4.4.0.200.206
  linux-image-powerpc-smp         4.4.0.200.206
  linux-image-powerpc64-emb       4.4.0.200.206
  linux-image-powerpc64-smp       4.4.0.200.206
  linux-image-virtual             4.4.0.200.206
  linux-image-virtual-hwe-16.04   4.15.0.132.130

Ubuntu 14.04 ESM:
  linux-image-4.4.0-200-generic   4.4.0-200.232~14.04.1
  linux-image-4.4.0-200-generic-lpae  4.4.0-200.232~14.04.1
  linux-image-4.4.0-200-lowlatency  4.4.0-200.232~14.04.1
  linux-image-4.4.0-200-powerpc-e500mc  4.4.0-200.232~14.04.1
  linux-image-4.4.0-200-powerpc-smp  4.4.0-200.232~14.04.1
  linux-image-4.4.0-200-powerpc64-emb  4.4.0-200.232~14.04.1
  linux-image-4.4.0-200-powerpc64-smp  4.4.0-200.232~14.04.1
  linux-image-generic-lpae-lts-xenial  4.4.0.200.175
  linux-image-generic-lts-xenial  4.4.0.200.175
  linux-image-lowlatency-lts-xenial  4.4.0.200.175
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.200.175
  linux-image-powerpc-smp-lts-xenial  4.4.0.200.175
  linux-image-powerpc64-emb-lts-xenial  4.4.0.200.175
  linux-image-powerpc64-smp-lts-xenial  4.4.0.200.175
  linux-image-virtual-lts-xenial  4.4.0.200.175

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.

References:
  https://usn.ubuntu.com/4694-1
  CVE-2020-28374

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.8.0-38.43
  https://launchpad.net/ubuntu/+source/linux/5.4.0-62.70
  https://launchpad.net/ubuntu/+source/linux-hwe-5.8/5.8.0-38.43~20.04.1
  https://launchpad.net/ubuntu/+source/linux/4.15.0-132.136
  https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-62.70~18.04.1
  https://launchpad.net/ubuntu/+source/linux/4.4.0-200.232
  https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-132.136~16.04.1