Exploit/Advisories

==========================================================================
Ubuntu Security Notice USN-6043-1
April 26, 2023

linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.19, linux-ibm,
linux-kvm, linux-lowlatency, linux-oracle, linux-raspi vulnerabilities
==========================================================================

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

- Ubuntu 22.10
- 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-hwe-5.19: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the Traffic-Control Index (TCINDEX) implementation
in the Linux kernel did not properly perform filter deactivation in some
situations. A local attacker could possibly use this to gain elevated
privileges. Please note that with the fix for this CVE, kernel support for
the TCINDEX classifier has been removed. (CVE-2023-1829)

It was discovered that the OverlayFS implementation in the Linux kernel did
not properly handle copy up operation in some conditions. A local attacker
could possibly use this to gain elevated privileges. (CVE-2023-0386)

Update instructions:

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

Ubuntu 22.10:
linux-image-5.19.0-1017-raspi 5.19.0-1017.24
linux-image-5.19.0-1017-raspi-nolpae 5.19.0-1017.24
linux-image-5.19.0-1021-ibm 5.19.0-1021.23
linux-image-5.19.0-1022-gcp 5.19.0-1022.24
linux-image-5.19.0-1022-kvm 5.19.0-1022.23
linux-image-5.19.0-1022-oracle 5.19.0-1022.25
linux-image-5.19.0-1023-lowlatency 5.19.0-1023.24
linux-image-5.19.0-1023-lowlatency-64k 5.19.0-1023.24
linux-image-5.19.0-1024-aws 5.19.0-1024.25
linux-image-5.19.0-1025-azure 5.19.0-1025.28
linux-image-5.19.0-41-generic 5.19.0-41.42
linux-image-5.19.0-41-generic-64k 5.19.0-41.42
linux-image-5.19.0-41-generic-lpae 5.19.0-41.42
linux-image-aws 5.19.0.1024.21
linux-image-azure 5.19.0.1025.20
linux-image-gcp 5.19.0.1022.18
linux-image-generic 5.19.0.41.37
linux-image-generic-64k 5.19.0.41.37
linux-image-generic-lpae 5.19.0.41.37
linux-image-ibm 5.19.0.1021.18
linux-image-kvm 5.19.0.1022.19
linux-image-lowlatency 5.19.0.1023.19
linux-image-lowlatency-64k 5.19.0.1023.19
linux-image-oracle 5.19.0.1022.18
linux-image-raspi 5.19.0.1017.16
linux-image-raspi-nolpae 5.19.0.1017.16
linux-image-virtual 5.19.0.41.37

Ubuntu 22.04 LTS:
linux-image-5.19.0-41-generic 5.19.0-41.42~22.04.1
linux-image-5.19.0-41-generic-64k 5.19.0-41.42~22.04.1
linux-image-5.19.0-41-generic-lpae 5.19.0-41.42~22.04.1
linux-image-generic-64k-hwe-22.04 5.19.0.41.42~22.04.14
linux-image-generic-hwe-22.04 5.19.0.41.42~22.04.14
linux-image-generic-lpae-hwe-22.04 5.19.0.41.42~22.04.14
linux-image-virtual-hwe-22.04 5.19.0.41.42~22.04.14

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-6043-1
CVE-2023-0386, CVE-2023-1829

Package Information:
https://launchpad.net/ubuntu/+source/linux/5.19.0-41.42
https://launchpad.net/ubuntu/+source/linux-aws/5.19.0-1024.25
https://launchpad.net/ubuntu/+source/linux-azure/5.19.0-1025.28
https://launchpad.net/ubuntu/+source/linux-gcp/5.19.0-1022.24
https://launchpad.net/ubuntu/+source/linux-ibm/5.19.0-1021.23
https://launchpad.net/ubuntu/+source/linux-kvm/5.19.0-1022.23
https://launchpad.net/ubuntu/+source/linux-lowlatency/5.19.0-1023.24
https://launchpad.net/ubuntu/+source/linux-oracle/5.19.0-1022.25
https://launchpad.net/ubuntu/+source/linux-raspi/5.19.0-1017.24
https://launchpad.net/ubuntu/+source/linux-hwe-5.19/5.19.0-41.42~22.04.1

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