=========================================================================
Ubuntu Security Notice USN-4713-2
February 10, 2021

linux, linux-gke-5.0, linux-gke-5.3, linux-hwe, linux-raspi2-5.3
vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 14.04 ESM

Summary:

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

Software Description:
- linux-gke-5.0: Linux kernel for Google Container Engine (GKE) systems
- linux-gke-5.3: Linux kernel for Google Container Engine (GKE) systems
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-raspi2-5.3: Linux kernel for Raspberry Pi (V8) systems
- linux: Linux kernel

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 18.04 LTS:
  linux-image-5.0.0-1051-gke      5.0.0-1051.53
  linux-image-5.3.0-1037-raspi2   5.3.0-1037.39
  linux-image-5.3.0-1040-gke      5.3.0-1040.43
  linux-image-5.3.0-70-generic    5.3.0-70.66
  linux-image-5.3.0-70-lowlatency  5.3.0-70.66
  linux-image-gke-5.0             5.0.0.1051.35
  linux-image-gke-5.3             5.3.0.1040.23
  linux-image-gkeop-5.3           5.3.0.70.127
  linux-image-raspi2-hwe-18.04    5.3.0.1037.26

Ubuntu 14.04 ESM:
  linux-image-3.13.0-184-generic  3.13.0-184.235
  linux-image-3.13.0-184-generic-lpae  3.13.0-184.235
  linux-image-3.13.0-184-lowlatency  3.13.0-184.235
  linux-image-3.13.0-184-powerpc-e500  3.13.0-184.235
  linux-image-3.13.0-184-powerpc-e500mc  3.13.0-184.235
  linux-image-3.13.0-184-powerpc-smp  3.13.0-184.235
  linux-image-3.13.0-184-powerpc64-emb  3.13.0-184.235
  linux-image-3.13.0-184-powerpc64-smp  3.13.0-184.235
  linux-image-generic             3.13.0.184.193
  linux-image-generic-lpae        3.13.0.184.193
  linux-image-generic-pae         3.13.0.184.193
  linux-image-highbank            3.13.0.184.193
  linux-image-lowlatency          3.13.0.184.193
  linux-image-lowlatency-pae      3.13.0.184.193
  linux-image-omap                3.13.0.184.193
  linux-image-powerpc-e500        3.13.0.184.193
  linux-image-powerpc-e500mc      3.13.0.184.193
  linux-image-powerpc-smp         3.13.0.184.193
  linux-image-powerpc64-emb       3.13.0.184.193
  linux-image-powerpc64-smp       3.13.0.184.193
  linux-image-server              3.13.0.184.193
  linux-image-virtual             3.13.0.184.193

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/4713-2
  https://usn.ubuntu.com/4713-1
  CVE-2020-28374

Package Information:
  https://launchpad.net/ubuntu/+source/linux-gke-5.0/5.0.0-1051.53
  https://launchpad.net/ubuntu/+source/linux-gke-5.3/5.3.0-1040.43
  https://launchpad.net/ubuntu/+source/linux-hwe/5.3.0-70.66
  https://launchpad.net/ubuntu/+source/linux-raspi2-5.3/5.3.0-1037.39