=========================================================================Ubuntu Security Notice USN-5086-1
September 22, 2021

linux, linux-hwe, linux-hwe-5.11, linux-hwe-5.4 vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM

Summary:

IBM s390x systems could be made to crash or run programs as an
administrator.

Software Description:
- linux: Linux kernel
- linux-hwe-5.11: Linux hardware enablement (HWE) kernel
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

Johan Almbladh discovered that the eBPF JIT implementation for IBM
s390x systems in the Linux kernel miscompiled operations in some
situations, allowing circumvention of the BPF verifier. A local
attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 21.04:
  linux-image-5.11.0-36-generic   5.11.0-36.40
  linux-image-5.11.0-36-generic-64k  5.11.0-36.40
  linux-image-5.11.0-36-generic-lpae  5.11.0-36.40
  linux-image-5.11.0-36-lowlatency  5.11.0-36.40
  linux-image-generic             5.11.0.36.38
  linux-image-generic-64k         5.11.0.36.38
  linux-image-generic-lpae        5.11.0.36.38
  linux-image-lowlatency          5.11.0.36.38
  linux-image-oem-20.04           5.11.0.36.38
  linux-image-virtual             5.11.0.36.38

Ubuntu 20.04 LTS:
  linux-image-5.11.0-36-generic   5.11.0-36.40~20.04.1
  linux-image-5.11.0-36-generic-64k  5.11.0-36.40~20.04.1
  linux-image-5.11.0-36-generic-lpae  5.11.0-36.40~20.04.1
  linux-image-5.11.0-36-lowlatency  5.11.0-36.40~20.04.1
  linux-image-5.4.0-86-generic    5.4.0-86.97
  linux-image-5.4.0-86-generic-lpae  5.4.0-86.97
  linux-image-5.4.0-86-lowlatency  5.4.0-86.97
  linux-image-generic             5.4.0.86.90
  linux-image-generic-64k-hwe-20.04  5.11.0.36.40~20.04.15
  linux-image-generic-hwe-20.04   5.11.0.36.40~20.04.15
  linux-image-generic-lpae        5.4.0.86.90
  linux-image-generic-lpae-hwe-20.04  5.11.0.36.40~20.04.15
  linux-image-lowlatency          5.4.0.86.90
  linux-image-lowlatency-hwe-20.04  5.11.0.36.40~20.04.15
  linux-image-oem                 5.4.0.86.90
  linux-image-oem-osp1            5.4.0.86.90
  linux-image-virtual             5.4.0.86.90
  linux-image-virtual-hwe-20.04   5.11.0.36.40~20.04.15

Ubuntu 18.04 LTS:
  linux-image-4.15.0-158-generic  4.15.0-158.166
  linux-image-4.15.0-158-generic-lpae  4.15.0-158.166
  linux-image-4.15.0-158-lowlatency  4.15.0-158.166
  linux-image-5.4.0-86-generic    5.4.0-86.97~18.04.1
  linux-image-5.4.0-86-generic-lpae  5.4.0-86.97~18.04.1
  linux-image-5.4.0-86-lowlatency  5.4.0-86.97~18.04.1
  linux-image-generic             4.15.0.158.147
  linux-image-generic-hwe-18.04   5.4.0.86.97~18.04.77
  linux-image-generic-lpae        4.15.0.158.147
  linux-image-generic-lpae-hwe-18.04  5.4.0.86.97~18.04.77
  linux-image-lowlatency          4.15.0.158.147
  linux-image-lowlatency-hwe-18.04  5.4.0.86.97~18.04.77
  linux-image-oem                 5.4.0.86.97~18.04.77
  linux-image-oem-osp1            5.4.0.86.97~18.04.77
  linux-image-snapdragon-hwe-18.04  5.4.0.86.97~18.04.77
  linux-image-virtual             4.15.0.158.147
  linux-image-virtual-hwe-18.04   5.4.0.86.97~18.04.77

Ubuntu 16.04 ESM:
  linux-image-4.15.0-158-generic  4.15.0-158.166~16.04.1
  linux-image-4.15.0-158-lowlatency  4.15.0-158.166~16.04.1
  linux-image-4.4.0-216-generic   4.4.0-216.249
  linux-image-4.4.0-216-lowlatency  4.4.0-216.249
  linux-image-generic             4.4.0.216.223
  linux-image-generic-hwe-16.04   4.15.0.158.151
  linux-image-lowlatency          4.4.0.216.223
  linux-image-lowlatency-hwe-16.04  4.15.0.158.151
  linux-image-oem                 4.15.0.158.151
  linux-image-virtual             4.4.0.216.223
  linux-image-virtual-hwe-16.04   4.15.0.158.151

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://ubuntu.com/security/notices/USN-5086-1
  https://launchpad.net/bugs/1943960

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.11.0-36.40
  https://launchpad.net/ubuntu/+source/linux/5.4.0-86.97
  https://launchpad.net/ubuntu/+source/linux-hwe-5.11/5.11.0-36.40~20.04.1
  https://launchpad.net/ubuntu/+source/linux/4.15.0-158.166
  https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-86.97~18.04.1

Ubuntu 5086-1: Linux kernel vulnerability

September 22, 2021
IBM s390x systems could be made to crash or run programs as an administrator.

Summary

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04: linux-image-5.11.0-36-generic 5.11.0-36.40 linux-image-5.11.0-36-generic-64k 5.11.0-36.40 linux-image-5.11.0-36-generic-lpae 5.11.0-36.40 linux-image-5.11.0-36-lowlatency 5.11.0-36.40 linux-image-generic 5.11.0.36.38 linux-image-generic-64k 5.11.0.36.38 linux-image-generic-lpae 5.11.0.36.38 linux-image-lowlatency 5.11.0.36.38 linux-image-oem-20.04 5.11.0.36.38 linux-image-virtual 5.11.0.36.38 Ubuntu 20.04 LTS: linux-image-5.11.0-36-generic 5.11.0-36.40~20.04.1 linux-image-5.11.0-36-generic-64k 5.11.0-36.40~20.04.1 linux-image-5.11.0-36-generic-lpae 5.11.0-36.40~20.04.1 linux-image-5.11.0-36-lowlatency 5.11.0-36.40~20.04.1 linux-image-5.4.0-86-generic 5.4.0-86.97 linux-image-5.4.0-86-generic-lpae 5.4.0-86.97 linux-image-5.4.0-86-lowlatency 5.4.0-86.97 linux-image-generic 5.4.0.86.90 linux-image-generic-64k-hwe-20.04 5.11.0.36.40~20.04.15 linux-image-generic-hwe-20.04 5.11.0.36.40~20.04.15 linux-image-generic-lpae 5.4.0.86.90 linux-image-generic-lpae-hwe-20.04 5.11.0.36.40~20.04.15 linux-image-lowlatency 5.4.0.86.90 linux-image-lowlatency-hwe-20.04 5.11.0.36.40~20.04.15 linux-image-oem 5.4.0.86.90 linux-image-oem-osp1 5.4.0.86.90 linux-image-virtual 5.4.0.86.90 linux-image-virtual-hwe-20.04 5.11.0.36.40~20.04.15 Ubuntu 18.04 LTS: linux-image-4.15.0-158-generic 4.15.0-158.166 linux-image-4.15.0-158-generic-lpae 4.15.0-158.166 linux-image-4.15.0-158-lowlatency 4.15.0-158.166 linux-image-5.4.0-86-generic 5.4.0-86.97~18.04.1 linux-image-5.4.0-86-generic-lpae 5.4.0-86.97~18.04.1 linux-image-5.4.0-86-lowlatency 5.4.0-86.97~18.04.1 linux-image-generic 4.15.0.158.147 linux-image-generic-hwe-18.04 5.4.0.86.97~18.04.77 linux-image-generic-lpae 4.15.0.158.147 linux-image-generic-lpae-hwe-18.04 5.4.0.86.97~18.04.77 linux-image-lowlatency 4.15.0.158.147 linux-image-lowlatency-hwe-18.04 5.4.0.86.97~18.04.77 linux-image-oem 5.4.0.86.97~18.04.77 linux-image-oem-osp1 5.4.0.86.97~18.04.77 linux-image-snapdragon-hwe-18.04 5.4.0.86.97~18.04.77 linux-image-virtual 4.15.0.158.147 linux-image-virtual-hwe-18.04 5.4.0.86.97~18.04.77 Ubuntu 16.04 ESM: linux-image-4.15.0-158-generic 4.15.0-158.166~16.04.1 linux-image-4.15.0-158-lowlatency 4.15.0-158.166~16.04.1 linux-image-4.4.0-216-generic 4.4.0-216.249 linux-image-4.4.0-216-lowlatency 4.4.0-216.249 linux-image-generic 4.4.0.216.223 linux-image-generic-hwe-16.04 4.15.0.158.151 linux-image-lowlatency 4.4.0.216.223 linux-image-lowlatency-hwe-16.04 4.15.0.158.151 linux-image-oem 4.15.0.158.151 linux-image-virtual 4.4.0.216.223 linux-image-virtual-hwe-16.04 4.15.0.158.151 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://ubuntu.com/security/notices/USN-5086-1

https://launchpad.net/bugs/1943960

Severity
September 22, 2021

Package Information

https://launchpad.net/ubuntu/+source/linux/5.11.0-36.40 https://launchpad.net/ubuntu/+source/linux/5.4.0-86.97 https://launchpad.net/ubuntu/+source/linux-hwe-5.11/5.11.0-36.40~20.04.1 https://launchpad.net/ubuntu/+source/linux/4.15.0-158.166 https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-86.97~18.04.1

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