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

USN-5853-1: Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-5853-1
February 09, 2023

linux, linux-aws, linux-azure, linux-azure-5.4, linux-gkeop, linux-kvm,
linux-oracle, linux-raspi, linux-raspi-5.4 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-gkeop: Linux kernel for Google Container Engine (GKE) 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-azure-5.4: Linux kernel for Microsoft Azure cloud systems
- linux-raspi-5.4: Linux kernel for Raspberry Pi systems

Details:

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)

Khalid Masum discovered that the NILFS2 file system implementation in the
Linux kernel did not properly handle certain error conditions, leading to a
use-after-free vulnerability. A local attacker could use this to cause a
denial of service or possibly execute arbitrary code. (CVE-2022-3649)

It was discovered that a race condition existed in the SMSC UFX USB driver
implementation in the Linux kernel, leading to a use-after-free
vulnerability. A physically proximate attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2022-41849)

It was discovered that a race condition existed in the Roccat HID driver in
the Linux kernel, 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-2022-41850)

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 20.04 LTS:
linux-image-5.4.0-1064-gkeop 5.4.0-1064.68
linux-image-5.4.0-1080-raspi 5.4.0-1080.91
linux-image-5.4.0-1086-kvm 5.4.0-1086.92
linux-image-5.4.0-1093-oracle 5.4.0-1093.102
linux-image-5.4.0-1096-aws 5.4.0-1096.104
linux-image-5.4.0-1103-azure 5.4.0-1103.109
linux-image-5.4.0-139-generic 5.4.0-139.156
linux-image-5.4.0-139-generic-lpae 5.4.0-139.156
linux-image-5.4.0-139-lowlatency 5.4.0-139.156
linux-image-aws-lts-20.04 5.4.0.1096.93
linux-image-azure-lts-20.04 5.4.0.1103.96
linux-image-generic 5.4.0.139.137
linux-image-generic-lpae 5.4.0.139.137
linux-image-gkeop 5.4.0.1064.62
linux-image-gkeop-5.4 5.4.0.1064.62
linux-image-kvm 5.4.0.1086.80
linux-image-lowlatency 5.4.0.139.137
linux-image-oem 5.4.0.139.137
linux-image-oem-osp1 5.4.0.139.137
linux-image-oracle-lts-20.04 5.4.0.1093.86
linux-image-raspi 5.4.0.1080.110
linux-image-raspi2 5.4.0.1080.110
linux-image-virtual 5.4.0.139.137

Ubuntu 18.04 LTS:
linux-image-5.4.0-1080-raspi 5.4.0-1080.91~18.04.1
linux-image-5.4.0-1103-azure 5.4.0-1103.109~18.04.1
linux-image-azure 5.4.0.1103.76
linux-image-raspi-hwe-18.04 5.4.0.1080.77

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-5853-1
CVE-2022-3628, CVE-2022-3640, CVE-2022-3649, CVE-2022-41849,
CVE-2022-41850, CVE-2022-42895

Package Information:
https://launchpad.net/ubuntu/+source/linux/5.4.0-139.156
https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1096.104
https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1103.109
https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1064.68
https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1086.92
https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1093.102
https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1080.91
https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1103.109~18.04.1
https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1080.91~18.04.1