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

[USN-6315-1] Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-6315-1
August 29, 2023

linux, linux-aws, linux-aws-5.15, linux-gcp, linux-gke, linux-gkeop,
linux-hwe-5.15, linux-ibm, linux-kvm, linux-lowlatency,
linux-lowlatency-hwe-5.15, linux-nvidia, linux-oracle, linux-oracle-5.15
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-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-aws-5.15: Linux kernel for Amazon Web Services (AWS) systems
- linux-hwe-5.15: Linux hardware enablement (HWE) kernel
- linux-lowlatency-hwe-5.15: Linux low latency kernel
- linux-oracle-5.15: Linux kernel for Oracle Cloud systems

Details:

Daniel Moghimi discovered that some Intel(R) Processors did not properly
clear microarchitectural state after speculative execution of various
instructions. A local unprivileged user could use this to obtain to
sensitive information. (CVE-2022-40982)

Tavis Ormandy discovered that some AMD processors did not properly handle
speculative execution of certain vector register instructions. A local
attacker could use this to expose sensitive information. (CVE-2023-20593)

Ye Zhang and Nicolas Wu discovered that the io_uring subsystem in the Linux
kernel did not properly handle locking for rings with IOPOLL, leading to a
double-free vulnerability. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2023-21400)

It was discovered that the universal 32bit network packet classifier
implementation in the Linux kernel did not properly perform reference
counting in some 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-2023-3609)

It was discovered that the netfilter subsystem 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
(system crash) or possibly execute arbitrary code. (CVE-2023-3610)

It was discovered that the Quick Fair Queueing network scheduler
implementation in the Linux kernel contained an out-of-bounds write
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2023-3611)

It was discovered that the network packet classifier with
netfilter/firewall marks implementation in the Linux kernel did not
properly handle reference counting, 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-2023-3776)

Kevin Rich discovered that the netfilter subsystem in the Linux kernel did
not properly handle table rules flush in certain circumstances. A local
attacker could possibly use this to cause a denial of service (system
crash) or execute arbitrary code. (CVE-2023-3777)

Kevin Rich discovered that the netfilter subsystem in the Linux kernel did
not properly handle rule additions to bound chains in certain
circumstances. A local attacker could possibly use this to cause a denial
of service (system crash) or execute arbitrary code. (CVE-2023-3995)

It was discovered that the netfilter subsystem in the Linux kernel did not
properly handle PIPAPO element removal, 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-2023-4004)

Kevin Rich discovered that the netfilter subsystem in the Linux kernel did
not properly handle bound chain deactivation in certain circumstances. A
local attacker could possibly use this to cause a denial of service (system
crash) or execute arbitrary code. (CVE-2023-4015)

Update instructions:

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

Ubuntu 22.04 LTS:
linux-image-5.15.0-1026-gkeop 5.15.0-1026.31
linux-image-5.15.0-1031-nvidia 5.15.0-1031.31
linux-image-5.15.0-1031-nvidia-lowlatency 5.15.0-1031.31
linux-image-5.15.0-1036-ibm 5.15.0-1036.39
linux-image-5.15.0-1040-gcp 5.15.0-1040.48
linux-image-5.15.0-1040-gke 5.15.0-1040.45
linux-image-5.15.0-1040-kvm 5.15.0-1040.45
linux-image-5.15.0-1041-oracle 5.15.0-1041.47
linux-image-5.15.0-1043-aws 5.15.0-1043.48
linux-image-5.15.0-82-generic 5.15.0-82.91
linux-image-5.15.0-82-generic-64k 5.15.0-82.91
linux-image-5.15.0-82-generic-lpae 5.15.0-82.91
linux-image-5.15.0-82-lowlatency 5.15.0-82.91
linux-image-5.15.0-82-lowlatency-64k 5.15.0-82.91
linux-image-aws-lts-22.04 5.15.0.1043.42
linux-image-gcp-lts-22.04 5.15.0.1040.36
linux-image-generic 5.15.0.82.78
linux-image-generic-64k 5.15.0.82.78
linux-image-generic-lpae 5.15.0.82.78
linux-image-gke 5.15.0.1040.39
linux-image-gke-5.15 5.15.0.1040.39
linux-image-gkeop 5.15.0.1026.25
linux-image-gkeop-5.15 5.15.0.1026.25
linux-image-ibm 5.15.0.1036.32
linux-image-kvm 5.15.0.1040.36
linux-image-lowlatency 5.15.0.82.84
linux-image-lowlatency-64k 5.15.0.82.84
linux-image-nvidia 5.15.0.1031.31
linux-image-nvidia-lowlatency 5.15.0.1031.31
linux-image-oracle-lts-22.04 5.15.0.1041.36
linux-image-virtual 5.15.0.82.78

Ubuntu 20.04 LTS:
linux-image-5.15.0-1041-oracle 5.15.0-1041.47~20.04.1
linux-image-5.15.0-1043-aws 5.15.0-1043.48~20.04.1
linux-image-5.15.0-82-generic 5.15.0-82.91~20.04.1
linux-image-5.15.0-82-generic-64k 5.15.0-82.91~20.04.1
linux-image-5.15.0-82-generic-lpae 5.15.0-82.91~20.04.1
linux-image-5.15.0-82-lowlatency 5.15.0-82.91~20.04.1
linux-image-5.15.0-82-lowlatency-64k 5.15.0-82.91~20.04.1
linux-image-aws 5.15.0.1043.48~20.04.31
linux-image-generic-64k-hwe-20.04 5.15.0.82.91~20.04.40
linux-image-generic-hwe-20.04 5.15.0.82.91~20.04.40
linux-image-generic-lpae-hwe-20.04 5.15.0.82.91~20.04.40
linux-image-lowlatency-64k-hwe-20.04 5.15.0.82.91~20.04.37
linux-image-lowlatency-hwe-20.04 5.15.0.82.91~20.04.37
linux-image-oem-20.04 5.15.0.82.91~20.04.40
linux-image-oem-20.04b 5.15.0.82.91~20.04.40
linux-image-oem-20.04c 5.15.0.82.91~20.04.40
linux-image-oem-20.04d 5.15.0.82.91~20.04.40
linux-image-oracle 5.15.0.1041.47~20.04.1
linux-image-virtual-hwe-20.04 5.15.0.82.91~20.04.40

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-6315-1
CVE-2022-40982, CVE-2023-20593, CVE-2023-21400, CVE-2023-3609,
CVE-2023-3610, CVE-2023-3611, CVE-2023-3776, CVE-2023-3777,
CVE-2023-3995, CVE-2023-4004, CVE-2023-4015

Package Information:
https://launchpad.net/ubuntu/+source/linux/5.15.0-82.91
https://launchpad.net/ubuntu/+source/linux-aws/5.15.0-1043.48
https://launchpad.net/ubuntu/+source/linux-gcp/5.15.0-1040.48
https://launchpad.net/ubuntu/+source/linux-gke/5.15.0-1040.45
https://launchpad.net/ubuntu/+source/linux-gkeop/5.15.0-1026.31
https://launchpad.net/ubuntu/+source/linux-ibm/5.15.0-1036.39
https://launchpad.net/ubuntu/+source/linux-kvm/5.15.0-1040.45
https://launchpad.net/ubuntu/+source/linux-lowlatency/5.15.0-82.91
https://launchpad.net/ubuntu/+source/linux-nvidia/5.15.0-1031.31
https://launchpad.net/ubuntu/+source/linux-oracle/5.15.0-1041.47
https://launchpad.net/ubuntu/+source/linux-aws-5.15/5.15.0-1043.48~20.04.1
https://launchpad.net/ubuntu/+source/linux-hwe-5.15/5.15.0-82.91~20.04.1

https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-5.15/5.15.0-82.91~20.04.1

https://launchpad.net/ubuntu/+source/linux-oracle-5.15/5.15.0-1041.47~20.04.1