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Ubuntu Security Notice USN-6383-1

Ubuntu Security Notice USN-6383-1
Posted Sep 20, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6383-1 - Jana Hofmann, Emanuele Vannacci, Cedric Fournet, Boris Kopf, and Oleksii Oleksenko discovered that some AMD processors could leak stale data from division operations in certain situations. A local attacker could possibly use this to expose sensitive information. It was discovered that the ARM64 KVM implementation in the Linux kernel did not properly restrict hypervisor memory access. An attacker in a guest VM could use this to execute arbitrary code in the host OS.

tags | advisory, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2023-20588, CVE-2023-21264, CVE-2023-40283, CVE-2023-4128, CVE-2023-4569
SHA-256 | c5be03314d6525a0dd88d31e6ba90e7d12a4b76d20a1e301e71a80a7805ade26

Ubuntu Security Notice USN-6383-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-6383-1
September 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-ibm,
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-ibm: Linux kernel for IBM cloud 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:

Jana Hofmann, Emanuele Vannacci, Cedric Fournet, Boris Kopf, and Oleksii
Oleksenko discovered that some AMD processors could leak stale data from
division operations in certain situations. A local attacker could possibly
use this to expose sensitive information. (CVE-2023-20588)

It was discovered that the ARM64 KVM implementation in the Linux kernel did
not properly restrict hypervisor memory access. An attacker in a guest VM
could use this to execute arbitrary code in the host OS. (CVE-2023-21264)

It was discovered that the bluetooth subsystem in the Linux kernel did not
properly handle L2CAP socket release, 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-2023-40283)

It was discovered that some network classifier implementations in the Linux
kernel contained use-after-free vulnerabilities. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2023-4128)

Lonial Con discovered that the netfilter subsystem in the Linux kernel
contained a memory leak when handling certain element flush operations. A
local attacker could use this to expose sensitive information (kernel
memory). (CVE-2023-4569)

Update instructions:

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

Ubuntu 23.04:
linux-image-6.2.0-1005-starfive 6.2.0-1005.6
linux-image-6.2.0-1010-ibm 6.2.0-1010.10
linux-image-6.2.0-1012-aws 6.2.0-1012.12
linux-image-6.2.0-1012-azure 6.2.0-1012.12
linux-image-6.2.0-1012-oracle 6.2.0-1012.12
linux-image-6.2.0-1013-kvm 6.2.0-1013.13
linux-image-6.2.0-1013-lowlatency 6.2.0-1013.13
linux-image-6.2.0-1013-lowlatency-64k 6.2.0-1013.13
linux-image-6.2.0-1013-raspi 6.2.0-1013.15
linux-image-6.2.0-1014-gcp 6.2.0-1014.14
linux-image-6.2.0-33-generic 6.2.0-33.33+1
linux-image-6.2.0-33-generic-64k 6.2.0-33.33+1
linux-image-6.2.0-33-generic-lpae 6.2.0-33.33
linux-image-aws 6.2.0.1012.13
linux-image-azure 6.2.0.1012.12
linux-image-gcp 6.2.0.1014.14
linux-image-generic 6.2.0.33.33
linux-image-generic-64k 6.2.0.33.33
linux-image-generic-lpae 6.2.0.33.33
linux-image-ibm 6.2.0.1010.10
linux-image-kvm 6.2.0.1013.13
linux-image-lowlatency 6.2.0.1013.13
linux-image-lowlatency-64k 6.2.0.1013.13
linux-image-oracle 6.2.0.1012.12
linux-image-raspi 6.2.0.1013.16
linux-image-raspi-nolpae 6.2.0.1013.16
linux-image-starfive 6.2.0.1005.8
linux-image-virtual 6.2.0.33.33

Ubuntu 22.04 LTS:
linux-image-6.2.0-1012-aws 6.2.0-1012.12~22.04.1
linux-image-6.2.0-1012-azure 6.2.0-1012.12~22.04.1
linux-image-6.2.0-1012-azure-fde 6.2.0-1012.12~22.04.1.1
linux-image-6.2.0-1013-lowlatency 6.2.0-1013.13~22.04.1
linux-image-6.2.0-1013-lowlatency-64k 6.2.0-1013.13~22.04.1
linux-image-6.2.0-1014-gcp 6.2.0-1014.14~22.04.1
linux-image-6.2.0-33-generic 6.2.0-33.33~22.04.1
linux-image-6.2.0-33-generic-64k 6.2.0-33.33~22.04.1
linux-image-6.2.0-33-generic-lpae 6.2.0-33.33~22.04.1
linux-image-aws 6.2.0.1012.12~22.04.1
linux-image-azure 6.2.0.1012.12~22.04.1
linux-image-azure-fde 6.2.0.1012.12~22.04.1.9
linux-image-gcp 6.2.0.1014.14~22.04.1
linux-image-generic-64k-hwe-22.04 6.2.0.33.33~22.04.10
linux-image-generic-hwe-22.04 6.2.0.33.33~22.04.10
linux-image-generic-lpae-hwe-22.04 6.2.0.33.33~22.04.10
linux-image-lowlatency-64k-hwe-22.04 6.2.0.1013.13~22.04.10
linux-image-lowlatency-hwe-22.04 6.2.0.1013.13~22.04.10
linux-image-virtual-hwe-22.04 6.2.0.33.33~22.04.10

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-6383-1
CVE-2023-20588, CVE-2023-21264, CVE-2023-40283, CVE-2023-4128,
CVE-2023-4569

Package Information:
https://launchpad.net/ubuntu/+source/linux/6.2.0-33.33
https://launchpad.net/ubuntu/+source/linux-aws/6.2.0-1012.12
https://launchpad.net/ubuntu/+source/linux-azure/6.2.0-1012.12
https://launchpad.net/ubuntu/+source/linux-gcp/6.2.0-1014.14
https://launchpad.net/ubuntu/+source/linux-ibm/6.2.0-1010.10
https://launchpad.net/ubuntu/+source/linux-kvm/6.2.0-1013.13
https://launchpad.net/ubuntu/+source/linux-lowlatency/6.2.0-1013.13
https://launchpad.net/ubuntu/+source/linux-oracle/6.2.0-1012.12
https://launchpad.net/ubuntu/+source/linux-raspi/6.2.0-1013.15
https://launchpad.net/ubuntu/+source/linux-starfive/6.2.0-1005.6
https://launchpad.net/ubuntu/+source/linux-aws-6.2/6.2.0-1012.12~22.04.1
https://launchpad.net/ubuntu/+source/linux-azure-6.2/6.2.0-1012.12~22.04.1

https://launchpad.net/ubuntu/+source/linux-azure-fde-6.2/6.2.0-1012.12~22.04.1.1
https://launchpad.net/ubuntu/+source/linux-gcp-6.2/6.2.0-1014.14~22.04.1
https://launchpad.net/ubuntu/+source/linux-hwe-6.2/6.2.0-33.33~22.04.1

https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-6.2/6.2.0-1013.13~22.04.1

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