Ubuntu 20.10 & 20.04 LTS: USN-4879-1 Critical: Kernel Fixes

ubuntu

March 16, 2021

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-raspi: Linux kernel for Raspberry Pi (V8) systems

- linux-hwe-5.8: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the Marvell WiFi-Ex device driver in the Linux

kernel did not properly validate ad-hoc SSIDs. A local attacker could use

this to cause a denial of service (system crash) or possibly execute

arbitrary code. (CVE-2020-36158)

Loris Reiff discovered that the BPF implementation in the Linux kernel did

not properly validate attributes in the getsockopt BPF hook. A local

attacker could possibly use this to cause a denial of service (system

crash). (CVE-2...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel fix ubuntu linux

Update Instructions

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

Ubuntu 20.10:
  linux-image-5.8.0-1017-raspi    5.8.0-1017.20
  linux-image-5.8.0-1017-raspi-nolpae  5.8.0-1017.20
  linux-image-5.8.0-1020-kvm      5.8.0-1020.22
  linux-image-5.8.0-1022-oracle   5.8.0-1022.23
  linux-image-5.8.0-1024-azure    5.8.0-1024.26
  linux-image-5.8.0-1024-gcp      5.8.0-1024.25
  linux-image-5.8.0-1025-aws      5.8.0-1025.27
  linux-image-5.8.0-45-generic    5.8.0-45.51
  linux-image-5.8.0-45-generic-64k  5.8.0-45.51
  linux-image-5.8.0-45-generic-lpae  5.8.0-45.51
  linux-image-5.8.0-45-lowlatency  5.8.0-45.51
  linux-image-aws                 5.8.0.1025.27
  linux-image-azure               5.8.0.1024.24
  linux-image-gcp                 5.8.0.1024.24
  linux-image-generic             5.8.0.45.50
  linux-image-generic-64k         5.8.0.45.50
  linux-image-generic-lpae        5.8.0.45.50
  linux-image-gke                 5.8.0.1024.24
  linux-image-kvm                 5.8.0.1020.22
  linux-image-lowlatency          5.8.0.45.50
  linux-image-oem-20.04           5.8.0.45.50
  linux-image-oracle              5.8.0.1022.21
  linux-image-raspi               5.8.0.1017.20
  linux-image-raspi-nolpae        5.8.0.1017.20
  linux-image-virtual             5.8.0.45.50

Ubuntu 20.04 LTS:
  linux-image-5.8.0-45-generic    5.8.0-45.51~20.04.1+1
  linux-image-5.8.0-45-generic-64k  5.8.0-45.51~20.04.1+1
  linux-image-5.8.0-45-generic-lpae  5.8.0-45.51~20.04.1
  linux-image-5.8.0-45-lowlatency  5.8.0-45.51~20.04.1+1
  linux-image-generic-64k-hwe-20.04  5.8.0.45.51~20.04.31
  linux-image-generic-hwe-20.04   5.8.0.45.51~20.04.31
  linux-image-generic-lpae-hwe-20.04  5.8.0.45.51~20.04.31
  linux-image-lowlatency-hwe-20.04  5.8.0.45.51~20.04.31
  linux-image-virtual-hwe-20.04   5.8.0.45.51~20.04.31

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.