==========================================================================
Ubuntu Security Notice USN-5267-2
February 08, 2022

linux, linux-aws, linux-aws-5.4, linux-gcp, linux-gcp-5.4, linux-hwe-5.4,
linux-ibm, linux-kvm, linux-oracle, linux-oracle-5.4 regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-ibm: Linux kernel for IBM cloud 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-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:

USN-5267-1 fixed vulnerabilities in the Linux kernel. Unfortunately,
that update introduced a regression that caused the kernel to freeze
when accessing CIFS shares in some situations.  This update fixes
the problem.

We apologize for the inconvenience.

Original advisory details:

 It was discovered that the Bluetooth subsystem in the Linux kernel
 contained 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-2021-3640)

 Likang Luo discovered that a race condition existed in the Bluetooth
 subsystem of 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-2021-3752)

 Luo Likang discovered that the FireDTV Firewire driver in the Linux kernel
 did not properly perform bounds checking in some situations. A local
 attacker could use this to cause a denial of service (system crash) or
 possibly execute arbitrary code. (CVE-2021-42739)

Update instructions:

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

Ubuntu 20.04 LTS:
  linux-image-5.4.0-1014-ibm      5.4.0-1014.15
  linux-image-5.4.0-1055-kvm      5.4.0-1055.57
  linux-image-5.4.0-1063-oracle   5.4.0-1063.67
  linux-image-5.4.0-1064-gcp      5.4.0-1064.68
  linux-image-5.4.0-1065-aws      5.4.0-1065.68
  linux-image-5.4.0-99-generic    5.4.0-99.112
  linux-image-5.4.0-99-generic-lpae  5.4.0-99.112
  linux-image-5.4.0-99-lowlatency  5.4.0-99.112
  linux-image-aws-lts-20.04       5.4.0.1065.67
  linux-image-gcp-lts-20.04       5.4.0.1064.74
  linux-image-generic             5.4.0.99.103
  linux-image-generic-lpae        5.4.0.99.103
  linux-image-ibm                 5.4.0.1014.15
  linux-image-ibm-lts-20.04       5.4.0.1014.15
  linux-image-kvm                 5.4.0.1055.54
  linux-image-lowlatency          5.4.0.99.103
  linux-image-oem                 5.4.0.99.103
  linux-image-oem-osp1            5.4.0.99.103
  linux-image-oracle-lts-20.04    5.4.0.1063.63
  linux-image-virtual             5.4.0.99.103

Ubuntu 18.04 LTS:
  linux-image-5.4.0-1063-oracle   5.4.0-1063.67~18.04.1
  linux-image-5.4.0-1064-gcp      5.4.0-1064.68~18.04.1
  linux-image-5.4.0-99-generic    5.4.0-99.112~18.04.1
  linux-image-5.4.0-99-generic-lpae  5.4.0-99.112~18.04.1
  linux-image-5.4.0-99-lowlatency  5.4.0-99.112~18.04.1
  linux-image-aws                 5.4.0.1065.47
  linux-image-gcp                 5.4.0.1064.49
  linux-image-generic-hwe-18.04   5.4.0.99.112~18.04.86
  linux-image-generic-lpae-hwe-18.04  5.4.0.99.112~18.04.86
  linux-image-lowlatency-hwe-18.04  5.4.0.99.112~18.04.86
  linux-image-oem                 5.4.0.99.112~18.04.86
  linux-image-oem-osp1            5.4.0.99.112~18.04.86
  linux-image-oracle              5.4.0.1063.67~18.04.42
  linux-image-snapdragon-hwe-18.04  5.4.0.99.112~18.04.86
  linux-image-virtual-hwe-18.04   5.4.0.99.112~18.04.86

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-5267-2
  https://ubuntu.com/security/notices/USN-5267-1
  https://launchpad.net/bugs/1959665

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.4.0-99.112
  https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1065.68
  https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1064.68
  https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1014.15
  https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1055.57
  https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1063.67
  https://launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1065.68~18.04.1
  https://launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1064.68~18.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-99.112~18.04.1
  https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1063.67~18.04.1