[USN-4879-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
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

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