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

USN-5920-1: Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-5920-1
March 03, 2023

linux, linux-aws, linux-dell300x, linux-gcp-4.15, linux-oracle
vulnerabilities
==========================================================================

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

- 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-dell300x: Linux kernel for Dell 300x platforms
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-oracle: Linux kernel for Oracle Cloud systems

Details:

It was discovered that the Upper Level Protocol (ULP) subsystem in the
Linux kernel did not properly handle sockets entering the LISTEN state in
certain protocols, 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-2023-0461)

Kyle Zeng discovered that the sysctl implementation in the Linux kernel
contained a stack-based buffer overflow. A local attacker could use this to
cause a denial of service (system crash) or execute arbitrary code.
(CVE-2022-4378)

It was discovered that a race condition existed in the Kernel Connection
Multiplexor (KCM) socket implementation in the Linux kernel when releasing
sockets in certain situations. A local attacker could use this to cause a
denial of service (system crash). (CVE-2022-3521)

It was discovered that the Netronome Ethernet driver in the Linux kernel
contained 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-2022-3545)

It was discovered that the Broadcom FullMAC USB WiFi driver in the Linux
kernel did not properly perform bounds checking in some situations. A
physically proximate attacker could use this to craft a malicious USB
device that when inserted, could cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2022-3628)

It was discovered that a use-after-free vulnerability existed in the
Bluetooth stack in the Linux kernel. A local attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2022-3640)

It was discovered that a race condition existed in the Xen network backend
driver in the Linux kernel when handling dropped packets in certain
circumstances. An attacker could use this to cause a denial of service
(kernel deadlock). (CVE-2022-42328, CVE-2022-42329)

Tamás Koczka discovered that the Bluetooth L2CAP implementation in the
Linux kernel did not properly initialize memory in some situations. A
physically proximate attacker could possibly use this to expose sensitive
information (kernel memory). (CVE-2022-42895)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1061-dell300x 4.15.0-1061.66
linux-image-4.15.0-1115-oracle 4.15.0-1115.126
linux-image-4.15.0-1146-gcp 4.15.0-1146.162
linux-image-4.15.0-1151-aws 4.15.0-1151.164
linux-image-4.15.0-206-generic 4.15.0-206.217
linux-image-4.15.0-206-generic-lpae 4.15.0-206.217
linux-image-4.15.0-206-lowlatency 4.15.0-206.217
linux-image-aws-lts-18.04 4.15.0.1151.149
linux-image-dell300x 4.15.0.1061.60
linux-image-gcp-lts-18.04 4.15.0.1146.160
linux-image-generic 4.15.0.206.189
linux-image-generic-lpae 4.15.0.206.189
linux-image-lowlatency 4.15.0.206.189
linux-image-oracle-lts-18.04 4.15.0.1115.120
linux-image-virtual 4.15.0.206.189

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-5920-1
CVE-2022-3521, CVE-2022-3545, CVE-2022-3628, CVE-2022-3640,
CVE-2022-42328, CVE-2022-42329, CVE-2022-42895, CVE-2022-4378,
CVE-2023-0461

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-206.217
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1151.164
https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1061.66
https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1146.162
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1115.126