[USN-6228-1] Linux kernel vulnerabilities

[Rodrigo Figueiredo Zaiden]

==========================================================================
Ubuntu Security Notice USN-6228-1
July 13, 2023

linux-azure, linux-gcp, linux-ibm, linux-oracle vulnerabilities
==========================================================================

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

- Ubuntu 23.04

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- 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-oracle: Linux kernel for Oracle Cloud systems

Details:

It was discovered that the XFS file system implementation in the Linux
kernel did not properly perform metadata validation when mounting certain
images. An attacker could use this to specially craft a file system image
that, when mounted, could cause a denial of service (system crash).
(CVE-2023-2124)

Wei Chen discovered that the InfiniBand RDMA communication manager
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). (CVE-2023-2176)

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-ibm      6.2.0-1005.5
   linux-image-6.2.0-1007-azure    6.2.0-1007.7
   linux-image-6.2.0-1007-oracle   6.2.0-1007.7
   linux-image-6.2.0-1009-gcp      6.2.0-1009.9
   linux-image-azure               6.2.0.1007.7
   linux-image-gcp                 6.2.0.1009.9
   linux-image-ibm                 6.2.0.1005.5
   linux-image-oracle              6.2.0.1007.7

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-6228-1
   CVE-2023-2124, CVE-2023-2176

Package Information:
   https://launchpad.net/ubuntu/+source/linux-azure/6.2.0-1007.7
   https://launchpad.net/ubuntu/+source/linux-gcp/6.2.0-1009.9
   https://launchpad.net/ubuntu/+source/linux-ibm/6.2.0-1005.5
   https://launchpad.net/ubuntu/+source/linux-oracle/6.2.0-1007.7

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