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

[USN-6462-1] Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-6462-1
October 31, 2023

linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4,
linux-bluefield, linux-gcp, linux-gcp-5.4, linux-gkeop, linux-hwe-5.4,
linux-ibm, linux-ibm-5.4, linux-kvm, linux-oracle, linux-oracle-5.4,
linux-raspi, linux-raspi-5.4, linux-xilinx-zynqmp vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)

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-bluefield: Linux kernel for NVIDIA BlueField platforms
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) 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-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-xilinx-zynqmp: Linux kernel for Xilinx ZynqMP processors
- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems
- 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
- linux-oracle-5.4: Linux kernel for Oracle Cloud systems
- linux-raspi-5.4: Linux kernel for Raspberry Pi systems

Details:

Seth Jenkins discovered that the Linux kernel did not properly perform
address randomization for a per-cpu memory management structure. A local
attacker could use this to expose sensitive information (kernel memory) or
in conjunction with another kernel vulnerability. (CVE-2023-0597)

Yu Hao and Weiteng Chen discovered that the Bluetooth HCI UART driver in
the Linux kernel contained a race condition, leading to a null pointer
dereference vulnerability. A local attacker could use this to cause a
denial of service (system crash). (CVE-2023-31083)

Lin Ma discovered that the Netlink Transformation (XFRM) subsystem in the
Linux kernel contained a null pointer dereference vulnerability in some
situations. A local privileged attacker could use this to cause a denial of
service (system crash). (CVE-2023-3772)

It was discovered that the Siano USB MDTV receiver device driver in the
Linux kernel did not properly handle device initialization failures in
certain situations, leading to a use-after-free vulnerability. A physically
proximate attacker could use this cause a denial of service (system crash).
(CVE-2023-4132)

Update instructions:

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

Ubuntu 20.04 LTS:
linux-image-5.4.0-1033-xilinx-zynqmp 5.4.0-1033.37
linux-image-5.4.0-1060-ibm 5.4.0-1060.65
linux-image-5.4.0-1074-bluefield 5.4.0-1074.80
linux-image-5.4.0-1080-gkeop 5.4.0-1080.84
linux-image-5.4.0-1097-raspi 5.4.0-1097.109
linux-image-5.4.0-1102-kvm 5.4.0-1102.108
linux-image-5.4.0-1112-oracle 5.4.0-1112.121
linux-image-5.4.0-1113-aws 5.4.0-1113.123
linux-image-5.4.0-1117-gcp 5.4.0-1117.126
linux-image-5.4.0-1119-azure 5.4.0-1119.126
linux-image-5.4.0-166-generic 5.4.0-166.183
linux-image-5.4.0-166-generic-lpae 5.4.0-166.183
linux-image-5.4.0-166-lowlatency 5.4.0-166.183
linux-image-aws-lts-20.04 5.4.0.1113.110
linux-image-azure-lts-20.04 5.4.0.1119.112
linux-image-bluefield 5.4.0.1074.69
linux-image-gcp-lts-20.04 5.4.0.1117.119
linux-image-generic 5.4.0.166.163
linux-image-generic-lpae 5.4.0.166.163
linux-image-gkeop 5.4.0.1080.78
linux-image-gkeop-5.4 5.4.0.1080.78
linux-image-ibm-lts-20.04 5.4.0.1060.89
linux-image-kvm 5.4.0.1102.97
linux-image-lowlatency 5.4.0.166.163
linux-image-oem 5.4.0.166.163
linux-image-oem-osp1 5.4.0.166.163
linux-image-oracle-lts-20.04 5.4.0.1112.105
linux-image-raspi 5.4.0.1097.127
linux-image-raspi2 5.4.0.1097.127
linux-image-virtual 5.4.0.166.163
linux-image-xilinx-zynqmp 5.4.0.1033.33

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
linux-image-5.4.0-1060-ibm 5.4.0-1060.65~18.04.1
linux-image-5.4.0-1097-raspi 5.4.0-1097.109~18.04.2
linux-image-5.4.0-1112-oracle 5.4.0-1112.121~18.04.4
linux-image-5.4.0-1113-aws 5.4.0-1113.123~18.04.1
linux-image-5.4.0-1117-gcp 5.4.0-1117.126~18.04.1
linux-image-5.4.0-1119-azure 5.4.0-1119.126~18.04.2
linux-image-5.4.0-166-generic 5.4.0-166.183~18.04.2
linux-image-5.4.0-166-lowlatency 5.4.0-166.183~18.04.2
linux-image-aws 5.4.0.1113.91
linux-image-azure 5.4.0.1119.92
linux-image-gcp 5.4.0.1117.93
linux-image-generic-hwe-18.04 5.4.0.166.183~18.04.134
linux-image-ibm 5.4.0.1060.71
linux-image-lowlatency-hwe-18.04 5.4.0.166.183~18.04.134
linux-image-oem 5.4.0.166.183~18.04.134
linux-image-oem-osp1 5.4.0.166.183~18.04.134
linux-image-oracle 5.4.0.1112.121~18.04.84
linux-image-raspi-hwe-18.04 5.4.0.1097.94
linux-image-snapdragon-hwe-18.04 5.4.0.166.183~18.04.134
linux-image-virtual-hwe-18.04 5.4.0.166.183~18.04.134

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-6462-1
CVE-2023-0597, CVE-2023-31083, CVE-2023-3772, CVE-2023-4132

Package Information:
https://launchpad.net/ubuntu/+source/linux/5.4.0-166.183
https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1113.123
https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1119.126
https://launchpad.net/ubuntu/+source/linux-bluefield/5.4.0-1074.80
https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1117.126
https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1080.84
https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1060.65
https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1102.108
https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1112.121
https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1097.109
https://launchpad.net/ubuntu/+source/linux-xilinx-zynqmp/5.4.0-1033.37