Ubuntu 16.04 LTS USN-4657-1 Critical: Multiple Kernel Flaws

ubuntu

December 1, 2020

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-kvm: Linux kernel for cloud environments

- linux-raspi2: Linux kernel for Raspberry Pi (V8) systems

- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

Elena Petrova discovered that the pin controller device tree implementation

in the Linux kernel did not properly handle string references. A local

attacker could use this to expose sensitive information (kernel memory).

(CVE-2020-0427)

Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen discovered

that legacy pairing and secure-connections pairing authentication in the

Bluetooth protocol could allow an unauthenticated user to complete

authentication without pairing credentials via adjacent access. A

physically proximate attacker could use this to imper...

Read the Full Advisory

Topics Covered

security advisory privilege escalation kernel ubuntu system crash memory exposure bluetooth

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1084-kvm      4.4.0-1084.93
  linux-image-4.4.0-1118-aws      4.4.0-1118.132
  linux-image-4.4.0-1142-raspi2   4.4.0-1142.152
  linux-image-4.4.0-1146-snapdragon  4.4.0-1146.156
  linux-image-4.4.0-197-generic   4.4.0-197.229
  linux-image-4.4.0-197-generic-lpae  4.4.0-197.229
  linux-image-4.4.0-197-lowlatency  4.4.0-197.229
  linux-image-4.4.0-197-powerpc-e500mc  4.4.0-197.229
  linux-image-4.4.0-197-powerpc-smp  4.4.0-197.229
  linux-image-4.4.0-197-powerpc64-emb  4.4.0-197.229
  linux-image-4.4.0-197-powerpc64-smp  4.4.0-197.229
  linux-image-aws                 4.4.0.1118.123
  linux-image-generic             4.4.0.197.203
  linux-image-generic-lpae        4.4.0.197.203
  linux-image-kvm                 4.4.0.1084.82
  linux-image-lowlatency          4.4.0.197.203
  linux-image-powerpc-e500mc      4.4.0.197.203
  linux-image-powerpc-smp         4.4.0.197.203
  linux-image-powerpc64-emb       4.4.0.197.203
  linux-image-powerpc64-smp       4.4.0.197.203
  linux-image-raspi2              4.4.0.1142.142
  linux-image-snapdragon          4.4.0.1146.138
  linux-image-virtual             4.4.0.197.203

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1082-aws      4.4.0-1082.86
  linux-image-4.4.0-197-generic   4.4.0-197.229~14.04.1
  linux-image-4.4.0-197-generic-lpae  4.4.0-197.229~14.04.1
  linux-image-4.4.0-197-lowlatency  4.4.0-197.229~14.04.1
  linux-image-4.4.0-197-powerpc-e500mc  4.4.0-197.229~14.04.1
  linux-image-4.4.0-197-powerpc-smp  4.4.0-197.229~14.04.1
  linux-image-4.4.0-197-powerpc64-emb  4.4.0-197.229~14.04.1
  linux-image-4.4.0-197-powerpc64-smp  4.4.0-197.229~14.04.1
  linux-image-aws                 4.4.0.1082.79
  linux-image-generic-lpae-lts-xenial  4.4.0.197.172
  linux-image-generic-lts-xenial  4.4.0.197.172
  linux-image-lowlatency-lts-xenial  4.4.0.197.172
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.197.172
  linux-image-powerpc-smp-lts-xenial  4.4.0.197.172
  linux-image-powerpc64-emb-lts-xenial  4.4.0.197.172
  linux-image-powerpc64-smp-lts-xenial  4.4.0.197.172
  linux-image-virtual-lts-xenial  4.4.0.197.172

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.