Ubuntu 20.04 LTS USN-4658-1 Critical: Linux Kernel Security Issues

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-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-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems

- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems

- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems

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

- linux-oracle-5.4: Linux kernel for Oracle Cloud systems

Details:

It was discovered that a race condition existed in the binder IPC

implementation in the Linux kernel, leading to a use-after-free

vulnerability. A local attacker could use this to cause a denial of service

(system crash) or possibly execute arbitrary code. (CVE-2020-0423)

...

Read the Full Advisory

Topics Covered

security advisory remote access Ubuntu system crash kernel issues

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.4.0-1028-kvm      5.4.0-1028.29
  linux-image-5.4.0-1030-aws      5.4.0-1030.31
  linux-image-5.4.0-1030-gcp      5.4.0-1030.32
  linux-image-5.4.0-1030-oracle   5.4.0-1030.32
  linux-image-5.4.0-1032-azure    5.4.0-1032.33
  linux-image-5.4.0-56-generic    5.4.0-56.62
  linux-image-5.4.0-56-generic-lpae  5.4.0-56.62
  linux-image-5.4.0-56-lowlatency  5.4.0-56.62
  linux-image-aws                 5.4.0.1030.31
  linux-image-azure               5.4.0.1032.30
  linux-image-gcp                 5.4.0.1030.38
  linux-image-generic             5.4.0.56.59
  linux-image-generic-hwe-20.04   5.4.0.56.59
  linux-image-generic-lpae        5.4.0.56.59
  linux-image-generic-lpae-hwe-20.04  5.4.0.56.59
  linux-image-gke                 5.4.0.1030.38
  linux-image-kvm                 5.4.0.1028.26
  linux-image-lowlatency          5.4.0.56.59
  linux-image-lowlatency-hwe-20.04  5.4.0.56.59
  linux-image-oem                 5.4.0.56.59
  linux-image-oem-osp1            5.4.0.56.59
  linux-image-oracle              5.4.0.1030.27
  linux-image-virtual             5.4.0.56.59
  linux-image-virtual-hwe-20.04   5.4.0.56.59

Ubuntu 18.04 LTS:
  linux-image-5.4.0-1030-aws      5.4.0-1030.31~18.04.1
  linux-image-5.4.0-1030-gcp      5.4.0-1030.32~18.04.1
  linux-image-5.4.0-1030-oracle   5.4.0-1030.32~18.04.1
  linux-image-5.4.0-1032-azure    5.4.0-1032.33~18.04.1
  linux-image-5.4.0-56-generic    5.4.0-56.62~18.04.1
  linux-image-5.4.0-56-generic-lpae  5.4.0-56.62~18.04.1
  linux-image-5.4.0-56-lowlatency  5.4.0-56.62~18.04.1
  linux-image-aws                 5.4.0.1030.15
  linux-image-azure               5.4.0.1032.14
  linux-image-gcp                 5.4.0.1030.18
  linux-image-generic-hwe-18.04   5.4.0.56.62~18.04.50
  linux-image-generic-lpae-hwe-18.04  5.4.0.56.62~18.04.50
  linux-image-lowlatency-hwe-18.04  5.4.0.56.62~18.04.50
  linux-image-oem-osp1            5.4.0.56.62~18.04.50
  linux-image-oracle              5.4.0.1030.14
  linux-image-snapdragon-hwe-18.04  5.4.0.56.62~18.04.50
  linux-image-virtual-hwe-18.04   5.4.0.56.62~18.04.50

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.