A Linux kernel security update has been released for Ubuntu Linux 22.04 LTS and 23.04.

[USN-6444-1] Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-6444-1
October 19, 2023

linux, linux-aws, linux-aws-6.2, linux-azure, linux-azure-6.2,
linux-azure-fde-6.2, linux-gcp, linux-gcp-6.2, linux-hwe-6.2, linux-kvm,
linux-lowlatency, linux-lowlatency-hwe-6.2, linux-oracle, linux-raspi,
linux-starfive vulnerabilities
==========================================================================

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

- Ubuntu 23.04
- Ubuntu 22.04 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-lowlatency: Linux low latency kernel
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-starfive: Linux kernel for StarFive processors
- linux-aws-6.2: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-6.2: Linux kernel for Microsoft Azure cloud systems
- linux-azure-fde-6.2: Linux kernel for Microsoft Azure CVM cloud systems
- linux-gcp-6.2: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe-6.2: Linux hardware enablement (HWE) kernel
- linux-lowlatency-hwe-6.2: Linux low latency kernel

Details:

Ross Lagerwall discovered that the Xen netback backend driver in the Linux
kernel did not properly handle certain unusual packets from a
paravirtualized network frontend, leading to a buffer overflow. An attacker
in a guest VM could use this to cause a denial of service (host system
crash) or possibly execute arbitrary code. (CVE-2023-34319)

Bien Pham discovered that the netfiler subsystem in the Linux kernel
contained a race condition, leading to a use-after-free vulnerability. A
local user could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2023-4244)

Kyle Zeng discovered that the networking stack implementation in the Linux
kernel did not properly validate skb object size in certain conditions. An
attacker could use this cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2023-42752)

Kyle Zeng discovered that the netfiler subsystem in the Linux kernel did
not properly calculate array offsets, leading to a out-of-bounds write
vulnerability. A local user could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2023-42753)

Kyle Zeng discovered that the IPv4 Resource Reservation Protocol (RSVP)
classifier implementation in the Linux kernel contained an out-of-bounds
read vulnerability. A local attacker could use this to cause a denial of
service (system crash). Please note that kernel packet classifier support
for RSVP has been removed to resolve this vulnerability. (CVE-2023-42755)

Kyle Zeng discovered that the netfilter subsystem in the Linux kernel
contained a race condition in IP set operations in certain situations. A
local attacker could use this to cause a denial of service (system crash).
(CVE-2023-42756)

Bing-Jhong Billy Jheng discovered that the Unix domain socket
implementation in the Linux kernel contained a race condition in certain
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-2023-4622)

Budimir Markovic discovered that the qdisc implementation in the Linux
kernel did not properly validate inner classes, leading to a use-after-free
vulnerability. A local user could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2023-4623)

Alex Birnberg discovered that the netfilter subsystem in the Linux kernel
did not properly validate register length, leading to an out-of- bounds
write vulnerability. A local attacker could possibly use this to cause a
denial of service (system crash). (CVE-2023-4881)

It was discovered that the Quick Fair Queueing scheduler implementation in
the Linux kernel did not properly handle network packets in certain
conditions, 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-2023-4921)

Kevin Rich discovered that the netfilter subsystem in the Linux kernel did
not properly handle removal of rules from chain bindings in certain
circumstances, leading to a use-after-free vulnerability. A local attacker
could possibly use this to cause a denial of service (system crash) or
execute arbitrary code. (CVE-2023-5197)

Update instructions:

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

Ubuntu 23.04:
linux-image-6.2.0-1007-starfive 6.2.0-1007.8
linux-image-6.2.0-1014-aws 6.2.0-1014.14
linux-image-6.2.0-1014-oracle 6.2.0-1014.14
linux-image-6.2.0-1015-azure 6.2.0-1015.15
linux-image-6.2.0-1015-kvm 6.2.0-1015.15
linux-image-6.2.0-1015-lowlatency 6.2.0-1015.15
linux-image-6.2.0-1015-lowlatency-64k 6.2.0-1015.15
linux-image-6.2.0-1015-raspi 6.2.0-1015.17
linux-image-6.2.0-1017-gcp 6.2.0-1017.19
linux-image-6.2.0-35-generic 6.2.0-35.35
linux-image-6.2.0-35-generic-64k 6.2.0-35.35
linux-image-6.2.0-35-generic-lpae 6.2.0-35.35
linux-image-aws 6.2.0.1014.15
linux-image-azure 6.2.0.1015.15
linux-image-gcp 6.2.0.1017.17
linux-image-generic 6.2.0.35.35
linux-image-generic-64k 6.2.0.35.35
linux-image-generic-lpae 6.2.0.35.35
linux-image-kvm 6.2.0.1015.15
linux-image-lowlatency 6.2.0.1015.15
linux-image-lowlatency-64k 6.2.0.1015.15
linux-image-oracle 6.2.0.1014.14
linux-image-raspi 6.2.0.1015.18
linux-image-raspi-nolpae 6.2.0.1015.18
linux-image-starfive 6.2.0.1007.10
linux-image-virtual 6.2.0.35.35

Ubuntu 22.04 LTS:
linux-image-6.2.0-1014-aws 6.2.0-1014.14~22.04.1
linux-image-6.2.0-1015-azure 6.2.0-1015.15~22.04.1
linux-image-6.2.0-1015-azure-fde 6.2.0-1015.15~22.04.1.1
linux-image-6.2.0-1015-lowlatency 6.2.0-1015.15~22.04.1
linux-image-6.2.0-1015-lowlatency-64k 6.2.0-1015.15~22.04.1
linux-image-6.2.0-1017-gcp 6.2.0-1017.19~22.04.1
linux-image-6.2.0-35-generic 6.2.0-35.35~22.04.1
linux-image-6.2.0-35-generic-64k 6.2.0-35.35~22.04.1
linux-image-6.2.0-35-generic-lpae 6.2.0-35.35~22.04.1
linux-image-aws 6.2.0.1014.14~22.04.1
linux-image-azure 6.2.0.1015.15~22.04.1
linux-image-azure-fde 6.2.0.1015.15~22.04.1.12
linux-image-gcp 6.2.0.1017.19~22.04.1
linux-image-generic-64k-hwe-22.04 6.2.0.35.35~22.04.13
linux-image-generic-hwe-22.04 6.2.0.35.35~22.04.13
linux-image-generic-lpae-hwe-22.04 6.2.0.35.35~22.04.13
linux-image-lowlatency-64k-hwe-22.04 6.2.0.1015.15~22.04.12
linux-image-lowlatency-hwe-22.04 6.2.0.1015.15~22.04.12
linux-image-virtual-hwe-22.04 6.2.0.35.35~22.04.13

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-6444-1
CVE-2023-34319, CVE-2023-4244, CVE-2023-42752, CVE-2023-42753,
CVE-2023-42755, CVE-2023-42756, CVE-2023-4622, CVE-2023-4623,
CVE-2023-4881, CVE-2023-4921, CVE-2023-5197

Package Information:
https://launchpad.net/ubuntu/+source/linux/6.2.0-35.35
https://launchpad.net/ubuntu/+source/linux-aws/6.2.0-1014.14
https://launchpad.net/ubuntu/+source/linux-azure/6.2.0-1015.15
https://launchpad.net/ubuntu/+source/linux-gcp/6.2.0-1017.19
https://launchpad.net/ubuntu/+source/linux-kvm/6.2.0-1015.15
https://launchpad.net/ubuntu/+source/linux-lowlatency/6.2.0-1015.15
https://launchpad.net/ubuntu/+source/linux-oracle/6.2.0-1014.14
https://launchpad.net/ubuntu/+source/linux-raspi/6.2.0-1015.17
https://launchpad.net/ubuntu/+source/linux-starfive/6.2.0-1007.8
https://launchpad.net/ubuntu/+source/linux-aws-6.2/6.2.0-1014.14~22.04.1
https://launchpad.net/ubuntu/+source/linux-azure-6.2/6.2.0-1015.15~22.04.1

https://launchpad.net/ubuntu/+source/linux-azure-fde-6.2/6.2.0-1015.15~22.04.1.1
https://launchpad.net/ubuntu/+source/linux-gcp-6.2/6.2.0-1017.19~22.04.1
https://launchpad.net/ubuntu/+source/linux-hwe-6.2/6.2.0-35.35~22.04.1

https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-6.2/6.2.0-1015.15~22.04.1