A Linux kernel security update has been released for Ubuntu Linux 18.04 LTS and 20.04 LTS.

USN-6094-1: Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-6094-1
May 22, 2023

linux, linux-aws, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4,
linux-gke, linux-gkeop, linux-hwe-5.4, linux-ibm, linux-ibm-5.4, linux-kvm
vulnerabilities
==========================================================================

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-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
- linux-ibm: Linux kernel for IBM cloud systems
- linux-kvm: Linux kernel for cloud environments
- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems
- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel
- linux-ibm-5.4: Linux kernel for IBM cloud systems

Details:

Zheng Wang discovered that the Intel i915 graphics driver in the Linux
kernel did not properly handle certain error conditions, leading to a
double-free. A local attacker could possibly use this to cause a denial of
service (system crash). (CVE-2022-3707)

Jordy Zomer and Alexandra Sandulescu discovered that the Linux kernel did
not properly implement speculative execution barriers in usercopy functions
in certain situations. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2023-0459)

It was discovered that the TLS subsystem in the Linux kernel contained a
type confusion vulnerability in some situations. A local attacker could use
this to cause a denial of service (system crash) or possibly expose
sensitive information. (CVE-2023-1075)

It was discovered that the Reliable Datagram Sockets (RDS) protocol
implementation in the Linux kernel contained a type confusion vulnerability
in some situations. An attacker could use this to cause a denial of service
(system crash). (CVE-2023-1078)

Xingyuan Mo discovered that the x86 KVM implementation in the Linux kernel
did not properly initialize some data structures. A local attacker could
use this to expose sensitive information (kernel memory). (CVE-2023-1513)

It was discovered that a use-after-free vulnerability existed in the iSCSI
TCP implementation in the Linux kernel. A local attacker could possibly use
this to cause a denial of service (system crash). (CVE-2023-2162)

It was discovered that the NET/ROM protocol implementation in the Linux
kernel contained a race condition in some situations, 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-2023-32269)

Duoming Zhou discovered that a race condition existed in the infrared
receiver/transceiver driver in the Linux kernel, leading to a use-after-
free vulnerability. A privileged attacker could use this to cause a denial
of service (system crash) or possibly execute arbitrary code.
(CVE-2023-1118)

Update instructions:

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

Ubuntu 20.04 LTS:
linux-image-5.4.0-1049-ibm 5.4.0-1049.54
linux-image-5.4.0-1069-gkeop 5.4.0-1069.73
linux-image-5.4.0-1091-kvm 5.4.0-1091.97
linux-image-5.4.0-1099-gke 5.4.0-1099.106
linux-image-5.4.0-1102-aws 5.4.0-1102.110
linux-image-5.4.0-1105-gcp 5.4.0-1105.114
linux-image-5.4.0-1108-azure 5.4.0-1108.114
linux-image-5.4.0-149-generic 5.4.0-149.166
linux-image-5.4.0-149-generic-lpae 5.4.0-149.166
linux-image-5.4.0-149-lowlatency 5.4.0-149.166
linux-image-aws-lts-20.04 5.4.0.1102.99
linux-image-azure-lts-20.04 5.4.0.1108.101
linux-image-gcp-lts-20.04 5.4.0.1105.107
linux-image-generic 5.4.0.149.147
linux-image-generic-lpae 5.4.0.149.147
linux-image-gke 5.4.0.1099.104
linux-image-gke-5.4 5.4.0.1099.104
linux-image-gkeop 5.4.0.1069.67
linux-image-gkeop-5.4 5.4.0.1069.67
linux-image-ibm 5.4.0.1049.75
linux-image-ibm-lts-20.04 5.4.0.1049.75
linux-image-kvm 5.4.0.1091.85
linux-image-lowlatency 5.4.0.149.147
linux-image-oem 5.4.0.149.147
linux-image-oem-osp1 5.4.0.149.147
linux-image-virtual 5.4.0.149.147

Ubuntu 18.04 LTS:
linux-image-5.4.0-1049-ibm 5.4.0-1049.54~18.04.1
linux-image-5.4.0-1105-gcp 5.4.0-1105.114~18.04.1
linux-image-5.4.0-1108-azure 5.4.0-1108.114~18.04.1
linux-image-5.4.0-149-generic 5.4.0-149.166~18.04.1
linux-image-5.4.0-149-generic-lpae 5.4.0-149.166~18.04.1
linux-image-5.4.0-149-lowlatency 5.4.0-149.166~18.04.1
linux-image-azure 5.4.0.1108.81
linux-image-gcp 5.4.0.1105.81
linux-image-generic-hwe-18.04 5.4.0.149.166~18.04.120
linux-image-generic-lpae-hwe-18.04 5.4.0.149.166~18.04.120
linux-image-ibm 5.4.0.1049.60
linux-image-lowlatency-hwe-18.04 5.4.0.149.166~18.04.120
linux-image-oem 5.4.0.149.166~18.04.120
linux-image-oem-osp1 5.4.0.149.166~18.04.120
linux-image-snapdragon-hwe-18.04 5.4.0.149.166~18.04.120
linux-image-virtual-hwe-18.04 5.4.0.149.166~18.04.120

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-6094-1
CVE-2022-3707, CVE-2023-0459, CVE-2023-1075, CVE-2023-1078,
CVE-2023-1118, CVE-2023-1513, CVE-2023-2162, CVE-2023-32269

Package Information:
https://launchpad.net/ubuntu/+source/linux/5.4.0-149.166
https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1102.110
https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1108.114
https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1105.114
https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1099.106
https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1069.73
https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1049.54
https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1091.97
https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1108.114~18.04.1
https://launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1105.114~18.04.1
https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-149.166~18.04.1
https://launchpad.net/ubuntu/+source/linux-ibm-5.4/5.4.0-1049.54~18.04.1