A Linux kernel security update has been released for Ubuntu Linux 20.04 LTS, 22.04 LTS, and 22.10.

USN-5814-1: Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-5814-1
January 19, 2023

linux-azure, linux-gkeop, linux-intel-iotg, linux-lowlatency,
linux-lowlatency-hwe-5.15, linux-oracle-5.15 vulnerabilities
==========================================================================

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

- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-lowlatency: Linux low latency kernel
- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
- linux-intel-iotg: Linux kernel for Intel IoT platforms
- linux-lowlatency-hwe-5.15: Linux low latency kernel
- linux-oracle-5.15: Linux kernel for Oracle Cloud systems

Details:

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)

Tamás Koczka discovered that the Bluetooth L2CAP handshake implementation
in the Linux kernel contained multiple use-after-free vulnerabilities. A
physically proximate attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2022-42896)

It was discovered that the Xen netback driver in the Linux kernel did not
properly handle packets structured in certain ways. An attacker in a guest
VM could possibly use this to cause a denial of service (host NIC
availability). (CVE-2022-3643)

It was discovered that an integer overflow vulnerability existed in the
Bluetooth subsystem in the Linux kernel. A physically proximate attacker
could use this to cause a denial of service (system crash).
(CVE-2022-45934)

Update instructions:

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

Ubuntu 22.10:
linux-image-5.19.0-1015-lowlatency 5.19.0-1015.16
linux-image-5.19.0-1015-lowlatency-64k 5.19.0-1015.16
linux-image-5.19.0-1017-azure 5.19.0-1017.18
linux-image-azure 5.19.0.1017.13
linux-image-lowlatency 5.19.0.1015.12
linux-image-lowlatency-64k 5.19.0.1015.12

Ubuntu 22.04 LTS:
linux-image-5.15.0-1013-gkeop 5.15.0-1013.17
linux-image-5.15.0-1023-intel-iotg 5.15.0-1023.28
linux-image-5.15.0-58-lowlatency 5.15.0-58.64
linux-image-5.15.0-58-lowlatency-64k 5.15.0-58.64
linux-image-gkeop 5.15.0.1013.12
linux-image-gkeop-5.15 5.15.0.1013.12
linux-image-intel-iotg 5.15.0.1023.22
linux-image-lowlatency 5.15.0.58.51
linux-image-lowlatency-64k 5.15.0.58.51
linux-image-lowlatency-64k-hwe-22.04 5.15.0.58.51
linux-image-lowlatency-hwe-22.04 5.15.0.58.51

Ubuntu 20.04 LTS:
linux-image-5.15.0-1027-oracle 5.15.0-1027.33~20.04.1
linux-image-5.15.0-58-lowlatency 5.15.0-58.64~20.04.1
linux-image-5.15.0-58-lowlatency-64k 5.15.0-58.64~20.04.1
linux-image-lowlatency-64k-hwe-20.04 5.15.0.58.64~20.04.21
linux-image-lowlatency-hwe-20.04 5.15.0.58.64~20.04.21
linux-image-oracle 5.15.0.1027.33~20.04.1

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-5814-1
CVE-2022-3643, CVE-2022-42896, CVE-2022-4378, CVE-2022-45934

Package Information:
https://launchpad.net/ubuntu/+source/linux-azure/5.19.0-1017.18
https://launchpad.net/ubuntu/+source/linux-lowlatency/5.19.0-1015.16
https://launchpad.net/ubuntu/+source/linux-gkeop/5.15.0-1013.17
https://launchpad.net/ubuntu/+source/linux-intel-iotg/5.15.0-1023.28
https://launchpad.net/ubuntu/+source/linux-lowlatency/5.15.0-58.64

https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-5.15/5.15.0-58.64~20.04.1

https://launchpad.net/ubuntu/+source/linux-oracle-5.15/5.15.0-1027.33~20.04.1