A Linux kernel security update has been released for Ubuntu Linux 14.04 ESM, 16.04 ESM, 18.04 LTS, and 20.04 LTS.

USN-5804-1: Linux kernel vulnerabilities

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