==========================================================================
Ubuntu Security Notice USN-5804-1
January 13, 2023

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp,
linux-gcp-5.4, linux-hwe, linux-ibm, linux-kvm, linux-oracle,
linux-oracle-5.4, vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

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-azure-4.15: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems
- linux-oracle-5.4: Linux kernel for Oracle Cloud systems
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-azure: Linux kernel for Microsoft Azure Cloud systems

Details:

It was discovered that the NFSD implementation in the Linux kernel did not
properly handle some RPC messages, leading to a buffer overflow. A remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2022-43945)

Tamás Koczka discovered that the Bluetooth L2CAP handshake implementation
in the Linux kernel contained multiple use-after-free vulnerabilities. A
physically proximate attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2022-42896)

It was discovered that the Xen netback driver in the Linux kernel did not
properly handle packets structured in certain ways. An attacker in a guest
VM could possibly use this to cause a denial of service (host NIC
availability). (CVE-2022-3643)

It was discovered that an integer overflow vulnerability existed in the
Bluetooth subsystem in the Linux kernel. A physically proximate attacker
could use this to cause a denial of service (system crash).
(CVE-2022-45934)

Update instructions:

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

Ubuntu 20.04 LTS:
  linux-image-5.4.0-1042-ibm      5.4.0-1042.47
  linux-image-5.4.0-1084-kvm      5.4.0-1084.90
  linux-image-5.4.0-1092-oracle   5.4.0-1092.101
  linux-image-5.4.0-1094-aws      5.4.0-1094.102
  linux-image-5.4.0-1098-gcp      5.4.0-1098.107
  linux-image-5.4.0-137-generic   5.4.0-137.154
  linux-image-5.4.0-137-generic-lpae  5.4.0-137.154
  linux-image-5.4.0-137-lowlatency  5.4.0-137.154
  linux-image-aws-lts-20.04       5.4.0.1094.91
  linux-image-gcp-lts-20.04       5.4.0.1098.100
  linux-image-generic             5.4.0.137.135
  linux-image-generic-lpae        5.4.0.137.135
  linux-image-ibm                 5.4.0.1042.68
  linux-image-ibm-lts-20.04       5.4.0.1042.68
  linux-image-kvm                 5.4.0.1084.78
  linux-image-lowlatency          5.4.0.137.135
  linux-image-oem                 5.4.0.137.135
  linux-image-oem-osp1            5.4.0.137.135
  linux-image-oracle-lts-20.04    5.4.0.1092.85
  linux-image-virtual             5.4.0.137.135

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1134-kvm     4.15.0-1134.139
  linux-image-4.15.0-1159-azure   4.15.0-1159.174
  linux-image-4.15.0-202-generic  4.15.0-202.213
  linux-image-4.15.0-202-generic-lpae  4.15.0-202.213
  linux-image-4.15.0-202-lowlatency  4.15.0-202.213
  linux-image-5.4.0-1092-oracle   5.4.0-1092.101~18.04.1
  linux-image-5.4.0-1098-gcp      5.4.0-1098.107~18.04.1
  linux-image-azure-lts-18.04     4.15.0.1159.127
  linux-image-gcp                 5.4.0.1098.74
  linux-image-generic             4.15.0.202.185
  linux-image-generic-lpae        4.15.0.202.185
  linux-image-kvm                 4.15.0.1134.125
  linux-image-lowlatency          4.15.0.202.185
  linux-image-oracle              5.4.0.1092.101~18.04.66
  linux-image-virtual             4.15.0.202.185

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1143-gcp     4.15.0-1143.159~16.04.1
  linux-image-4.15.0-1148-aws-hwe  4.15.0-1148.160~16.04.1
  linux-image-4.15.0-202-generic  4.15.0-202.213~16.04.1
  linux-image-4.15.0-202-lowlatency  4.15.0-202.213~16.04.1
  linux-image-aws-hwe             4.15.0.1148.133
  linux-image-gcp                 4.15.0.1143.135
  linux-image-generic-hwe-16.04   4.15.0.202.187
  linux-image-gke                 4.15.0.1143.135
  linux-image-lowlatency-hwe-16.04  4.15.0.202.187
  linux-image-oem                 4.15.0.202.187
  linux-image-virtual-hwe-16.04   4.15.0.202.187

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1159-azure   4.15.0-1159.174~14.04.1
  linux-image-azure               4.15.0.1159.126

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-5804-1
  CVE-2022-3643, CVE-2022-42896, CVE-2022-43945, CVE-2022-45934

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.4.0-137.154
  https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1094.102
  https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1098.107
  https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1042.47
  https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1084.90
  https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1092.101
  https://launchpad.net/ubuntu/+source/linux/4.15.0-202.213
  https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1159.174
  https://launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1098.107~18.04.1
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1134.139
  https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1092.101~18.04.1