==========================================================================
Ubuntu Security Notice USN-6502-4
November 30, 2023

linux-azure, linux-azure-6.2, linux-azure-fde-6.2, linux-gcp,
linux-gcp-6.2 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-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) 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

Details:

Ivan D Barrera, Christopher Bednarz, Mustafa Ismail, and Shiraz Saleem
discovered that the InfiniBand RDMA driver in the Linux kernel did not
properly check for zero-length STAG or MR registration. A remote attacker
could possibly use this to execute arbitrary code. (CVE-2023-25775)

Yu Hao discovered that the UBI driver in the Linux kernel did not properly
check for MTD with zero erasesize during device attachment. A local
privileged attacker could use this to cause a denial of service (system
crash). (CVE-2023-31085)

Manfred Rudigier discovered that the Intel(R) PCI-Express Gigabit (igb)
Ethernet driver in the Linux kernel did not properly validate received
frames that are larger than the set MTU size, leading to a buffer overflow
vulnerability. An attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2023-45871)

Maxim Levitsky discovered that the KVM nested virtualization (SVM)
implementation for AMD processors in the Linux kernel did not properly
handle x2AVIC MSRs. An attacker in a guest VM could use this to cause a
denial of service (host kernel crash). (CVE-2023-5090)

It was discovered that the SMB network file sharing protocol implementation
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-2023-5345)

Update instructions:

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

Ubuntu 23.04:
   linux-image-6.2.0-1017-azure    6.2.0-1017.17
   linux-image-6.2.0-1019-gcp      6.2.0-1019.21
   linux-image-azure               6.2.0.1017.17
   linux-image-gcp                 6.2.0.1019.19

Ubuntu 22.04 LTS:
   linux-image-6.2.0-1017-azure    6.2.0-1017.17~22.04.1
   linux-image-6.2.0-1017-azure-fde  6.2.0-1017.17~22.04.1.1
   linux-image-6.2.0-1019-gcp      6.2.0-1019.21~22.04.1
   linux-image-azure               6.2.0.1017.17~22.04.1
   linux-image-azure-fde           6.2.0.1017.17~22.04.1.14
   linux-image-gcp                 6.2.0.1019.21~22.04.1

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-6502-4
   https://ubuntu.com/security/notices/USN-6502-1
   CVE-2023-25775, CVE-2023-31085, CVE-2023-45871, CVE-2023-5090,
   CVE-2023-5345

Package Information:
   https://launchpad.net/ubuntu/+source/linux-azure/6.2.0-1017.17
   https://launchpad.net/ubuntu/+source/linux-gcp/6.2.0-1019.21
   https://launchpad.net/ubuntu/+source/linux-azure-6.2/6.2.0-1017.17~22.04.1
 
https://launchpad.net/ubuntu/+source/linux-azure-fde-6.2/6.2.0-1017.17~22.04.1.1
   https://launchpad.net/ubuntu/+source/linux-gcp-6.2/6.2.0-1019.21~22.04.1