A Linux kernel security update has been released for Ubuntu Linux 20.04 LTS and 20.10.

USN-4879-1: Linux kernel vulnerabilities

=========================================================================
Ubuntu Security Notice USN-4879-1
March 16, 2021

linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm,
linux-oracle, linux-raspi vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS

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-2021-20194)

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.

References:
  https://ubuntu.com/security/notices/USN-4879-1
CVE-2020-36158, CVE-2021-20194

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.8.0-45.51
  https://launchpad.net/ubuntu/+source/linux-aws/5.8.0-1025.27
  https://launchpad.net/ubuntu/+source/linux-azure/5.8.0-1024.26
  https://launchpad.net/ubuntu/+source/linux-gcp/5.8.0-1024.25
  https://launchpad.net/ubuntu/+source/linux-kvm/5.8.0-1020.22
  https://launchpad.net/ubuntu/+source/linux-oracle/5.8.0-1022.23
  https://launchpad.net/ubuntu/+source/linux-raspi/5.8.0-1017.20
  https://launchpad.net/ubuntu/+source/linux-hwe-5.8/5.8.0-45.51~20.04.1