A Linux kernel security update has been released for Ubuntu Linux 20.04 LTS and 22.04 LTS.

USN-6080-1: Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-6080-1
May 16, 2023

linux, linux-aws, linux-aws-5.15, linux-azure, linux-azure-5.15,
linux-azure-fde, linux-azure-fde-5.15, linux-hwe-5.15, linux-ibm,
linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-oracle
vulnerabilities
==========================================================================

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

- Ubuntu 22.04 LTS
- 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-azure-fde: Linux kernel for Microsoft Azure CVM cloud systems
- linux-ibm: Linux kernel for IBM cloud systems
- linux-kvm: Linux kernel for cloud environments
- linux-lowlatency: Linux low latency kernel
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-aws-5.15: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-5.15: Linux kernel for Microsoft Azure cloud systems
- linux-azure-fde-5.15: Linux kernel for Microsoft Azure CVM cloud systems
- linux-hwe-5.15: Linux hardware enablement (HWE) kernel
- linux-lowlatency-hwe-5.15: Linux low latency kernel

Details:

It was discovered that some AMD x86-64 processors with SMT enabled could
speculatively execute instructions using a return address from a sibling
thread. A local attacker could possibly use this to expose sensitive
information. (CVE-2022-27672)

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 the Android Binder IPC subsystem in the Linux kernel
did not properly validate inputs 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-2023-20938)

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 22.04 LTS:
linux-image-5.15.0-1030-ibm 5.15.0-1030.33
linux-image-5.15.0-1033-kvm 5.15.0-1033.38
linux-image-5.15.0-1035-oracle 5.15.0-1035.41
linux-image-5.15.0-1036-aws 5.15.0-1036.40
linux-image-5.15.0-1038-azure 5.15.0-1038.45
linux-image-5.15.0-1038-azure-fde 5.15.0-1038.45.1
linux-image-5.15.0-72-generic 5.15.0-72.79
linux-image-5.15.0-72-generic-64k 5.15.0-72.79
linux-image-5.15.0-72-generic-lpae 5.15.0-72.79
linux-image-5.15.0-72-lowlatency 5.15.0-72.79
linux-image-5.15.0-72-lowlatency-64k 5.15.0-72.79
linux-image-aws-lts-22.04 5.15.0.1036.35
linux-image-azure 5.15.0.1038.34
linux-image-azure-fde 5.15.0.1038.45.15
linux-image-azure-lts-22.04 5.15.0.1038.34
linux-image-generic 5.15.0.72.70
linux-image-generic-64k 5.15.0.72.70
linux-image-generic-lpae 5.15.0.72.70
linux-image-ibm 5.15.0.1030.26
linux-image-kvm 5.15.0.1033.29
linux-image-lowlatency 5.15.0.72.77
linux-image-lowlatency-64k 5.15.0.72.77
linux-image-oracle 5.15.0.1035.30
linux-image-virtual 5.15.0.72.70

Ubuntu 20.04 LTS:
linux-image-5.15.0-1036-aws 5.15.0-1036.40~20.04.1
linux-image-5.15.0-1038-azure 5.15.0-1038.45~20.04.1
linux-image-5.15.0-1038-azure-fde 5.15.0-1038.45~20.04.1.1
linux-image-5.15.0-72-generic 5.15.0-72.79~20.04.1
linux-image-5.15.0-72-generic-64k 5.15.0-72.79~20.04.1
linux-image-5.15.0-72-generic-lpae 5.15.0-72.79~20.04.1
linux-image-5.15.0-72-lowlatency 5.15.0-72.79~20.04.1
linux-image-5.15.0-72-lowlatency-64k 5.15.0-72.79~20.04.1
linux-image-aws 5.15.0.1036.40~20.04.25
linux-image-azure 5.15.0.1038.45~20.04.28
linux-image-azure-cvm 5.15.0.1038.45~20.04.28
linux-image-azure-fde 5.15.0.1038.45~20.04.1.17
linux-image-generic-64k-hwe-20.04 5.15.0.72.79~20.04.33
linux-image-generic-hwe-20.04 5.15.0.72.79~20.04.33
linux-image-generic-lpae-hwe-20.04 5.15.0.72.79~20.04.33
linux-image-lowlatency-64k-hwe-20.04 5.15.0.72.79~20.04.30
linux-image-lowlatency-hwe-20.04 5.15.0.72.79~20.04.30
linux-image-oem-20.04 5.15.0.72.79~20.04.33
linux-image-oem-20.04b 5.15.0.72.79~20.04.33
linux-image-oem-20.04c 5.15.0.72.79~20.04.33
linux-image-oem-20.04d 5.15.0.72.79~20.04.33
linux-image-virtual-hwe-20.04 5.15.0.72.79~20.04.33

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-6080-1
CVE-2022-27672, CVE-2022-3707, CVE-2023-0459, CVE-2023-1075,
CVE-2023-1078, CVE-2023-1118, CVE-2023-1513, CVE-2023-20938,
CVE-2023-2162, CVE-2023-32269

Package Information:
https://launchpad.net/ubuntu/+source/linux/5.15.0-72.79
https://launchpad.net/ubuntu/+source/linux-aws/5.15.0-1036.40
https://launchpad.net/ubuntu/+source/linux-azure/5.15.0-1038.45
https://launchpad.net/ubuntu/+source/linux-azure-fde/5.15.0-1038.45.1
https://launchpad.net/ubuntu/+source/linux-ibm/5.15.0-1030.33
https://launchpad.net/ubuntu/+source/linux-kvm/5.15.0-1033.38
https://launchpad.net/ubuntu/+source/linux-lowlatency/5.15.0-72.79
https://launchpad.net/ubuntu/+source/linux-oracle/5.15.0-1035.41
https://launchpad.net/ubuntu/+source/linux-aws-5.15/5.15.0-1036.40~20.04.1
https://launchpad.net/ubuntu/+source/linux-azure-5.15/5.15.0-1038.45~20.04.1

https://launchpad.net/ubuntu/+source/linux-azure-fde-5.15/5.15.0-1038.45~20.04.1.1
https://launchpad.net/ubuntu/+source/linux-hwe-5.15/5.15.0-72.79~20.04.1

https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-5.15/5.15.0-72.79~20.04.1