Ubuntu 23.04: USN-6502-4 critical: multiple kernel threats

ubuntu

November 30, 2023

Several security issues were fixed in the Linux kernel.

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 dis...

Read the Full Advisory

Topics Covered

security advisory denial of service buffer overflow remote code execution Ubuntu kernel

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.