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

[USN-6446-1] Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-6446-1
October 20, 2023

linux, linux-aws, linux-aws-5.15, linux-azure, linux-azure-5.15,
linux-azure-fde, linux-azure-fde-5.15, linux-gcp, linux-gke, linux-gkeop,
linux-hwe-5.15, linux-ibm, linux-ibm-5.15, linux-kvm, linux-lowlatency,
linux-lowlatency-hwe-5.15,linux-nvidia, linux-oracle, linux-raspi
vulnerabilities
==========================================================================

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

- Ubuntu 22.04 LTS
- Ubuntu 20.04 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-azure-fde: Linux kernel for Microsoft Azure CVM cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke: Linux kernel for Google Container Engine (GKE) 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-lowlatency: Linux low latency kernel
- linux-nvidia: Linux kernel for NVIDIA systems
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-aws-5.15: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-5.15: Linux kernel for Microsoft Azure cloud systems
- linux-azure-fde-5.15: Linux kernel for Microsoft Azure CVM cloud systems
- linux-hwe-5.15: Linux hardware enablement (HWE) kernel
- linux-ibm-5.15: Linux kernel for IBM cloud systems
- linux-lowlatency-hwe-5.15: 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 22.04 LTS:
linux-image-5.15.0-1031-gkeop 5.15.0-1031.37
linux-image-5.15.0-1039-nvidia 5.15.0-1039.39
linux-image-5.15.0-1039-nvidia-lowlatency 5.15.0-1039.39
linux-image-5.15.0-1041-ibm 5.15.0-1041.44
linux-image-5.15.0-1041-raspi 5.15.0-1041.44
linux-image-5.15.0-1045-gcp 5.15.0-1045.53
linux-image-5.15.0-1045-gke 5.15.0-1045.50
linux-image-5.15.0-1045-kvm 5.15.0-1045.50
linux-image-5.15.0-1046-oracle 5.15.0-1046.52
linux-image-5.15.0-1048-aws 5.15.0-1048.53
linux-image-5.15.0-1050-azure 5.15.0-1050.57
linux-image-5.15.0-1050-azure-fde 5.15.0-1050.57.1
linux-image-5.15.0-87-generic 5.15.0-87.97
linux-image-5.15.0-87-generic-64k 5.15.0-87.97
linux-image-5.15.0-87-generic-lpae 5.15.0-87.97
linux-image-5.15.0-87-lowlatency 5.15.0-87.96
linux-image-5.15.0-87-lowlatency-64k 5.15.0-87.96
linux-image-aws-lts-22.04 5.15.0.1048.47
linux-image-azure-fde-lts-22.04 5.15.0.1050.57.28
linux-image-azure-lts-22.04 5.15.0.1050.46
linux-image-gcp-lts-22.04 5.15.0.1045.41
linux-image-generic 5.15.0.87.84
linux-image-generic-64k 5.15.0.87.84
linux-image-generic-lpae 5.15.0.87.84
linux-image-gke 5.15.0.1045.44
linux-image-gke-5.15 5.15.0.1045.44
linux-image-gkeop 5.15.0.1031.30
linux-image-gkeop-5.15 5.15.0.1031.30
linux-image-ibm 5.15.0.1041.37
linux-image-kvm 5.15.0.1045.41
linux-image-lowlatency 5.15.0.87.89
linux-image-lowlatency-64k 5.15.0.87.89
linux-image-nvidia 5.15.0.1039.39
linux-image-nvidia-lowlatency 5.15.0.1039.39
linux-image-oracle 5.15.0.1046.41
linux-image-oracle-lts-22.04 5.15.0.1046.41
linux-image-raspi 5.15.0.1041.39
linux-image-raspi-nolpae 5.15.0.1041.39
linux-image-virtual 5.15.0.87.84

Ubuntu 20.04 LTS:
linux-image-5.15.0-1041-ibm 5.15.0-1041.44~20.04.1
linux-image-5.15.0-1048-aws 5.15.0-1048.53~20.04.1
linux-image-5.15.0-1050-azure 5.15.0-1050.57~20.04.1
linux-image-5.15.0-1050-azure-fde 5.15.0-1050.57~20.04.1.1
linux-image-5.15.0-87-generic 5.15.0-87.97~20.04.1
linux-image-5.15.0-87-generic-64k 5.15.0-87.97~20.04.1
linux-image-5.15.0-87-generic-lpae 5.15.0-87.97~20.04.1
linux-image-5.15.0-87-lowlatency 5.15.0-87.96~20.04.1
linux-image-5.15.0-87-lowlatency-64k 5.15.0-87.96~20.04.1
linux-image-aws 5.15.0.1048.53~20.04.36
linux-image-azure 5.15.0.1050.57~20.04.39
linux-image-azure-cvm 5.15.0.1050.57~20.04.39
linux-image-azure-fde 5.15.0.1050.57~20.04.1.28
linux-image-generic-64k-hwe-20.04 5.15.0.87.97~20.04.45
linux-image-generic-hwe-20.04 5.15.0.87.97~20.04.45
linux-image-generic-lpae-hwe-20.04 5.15.0.87.97~20.04.45
linux-image-ibm 5.15.0.1041.44~20.04.13
linux-image-lowlatency-64k-hwe-20.04 5.15.0.87.96~20.04.42
linux-image-lowlatency-hwe-20.04 5.15.0.87.96~20.04.42
linux-image-oem-20.04 5.15.0.87.97~20.04.45
linux-image-oem-20.04b 5.15.0.87.97~20.04.45
linux-image-oem-20.04c 5.15.0.87.97~20.04.45
linux-image-oem-20.04d 5.15.0.87.97~20.04.45
linux-image-virtual-hwe-20.04 5.15.0.87.97~20.04.45

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-6446-1
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/5.15.0-87.97
https://launchpad.net/ubuntu/+source/linux-aws/5.15.0-1048.53
https://launchpad.net/ubuntu/+source/linux-azure/5.15.0-1050.57
https://launchpad.net/ubuntu/+source/linux-azure-fde/5.15.0-1050.57.1
https://launchpad.net/ubuntu/+source/linux-gcp/5.15.0-1045.53
https://launchpad.net/ubuntu/+source/linux-gke/5.15.0-1045.50
https://launchpad.net/ubuntu/+source/linux-gkeop/5.15.0-1031.37
https://launchpad.net/ubuntu/+source/linux-ibm/5.15.0-1041.44
https://launchpad.net/ubuntu/+source/linux-kvm/5.15.0-1045.50
https://launchpad.net/ubuntu/+source/linux-lowlatency/5.15.0-87.96
https://launchpad.net/ubuntu/+source/linux-nvidia/5.15.0-1039.39
https://launchpad.net/ubuntu/+source/linux-oracle/5.15.0-1046.52
https://launchpad.net/ubuntu/+source/linux-raspi/5.15.0-1041.44
https://launchpad.net/ubuntu/+source/linux-aws-5.15/5.15.0-1048.53~20.04.1
https://launchpad.net/ubuntu/+source/linux-azure-5.15/5.15.0-1050.57~20.04.1

https://launchpad.net/ubuntu/+source/linux-azure-fde-5.15/5.15.0-1050.57~20.04.1.1
https://launchpad.net/ubuntu/+source/linux-hwe-5.15/5.15.0-87.97~20.04.1
https://launchpad.net/ubuntu/+source/linux-ibm-5.15/5.15.0-1041.44~20.04.1

https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-5.15/5.15.0-87.96~20.04.1