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Ubuntu 23.10 USN-6572-1 critical: linux-azure denial of service

ubuntu
Calendar Grey January 9, 2024
Dist Ubuntu Esm H88
Various security flaws resolved in Ubuntu's Linux kernel, posing significant threats to Azure environments. Prompt update recommended.
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

Details:

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)

Bien Pham discovered that the netfiler subsystem in the Linux kernel

contained a race condition, leading to a use-after-free vulnerability. A

local user could use this to cause a denial of service (system crash) or

possibly execute arbitrary code. (CVE-2023-4244)

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 shari...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel ubuntu system crash azure

Update Instructions

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

Ubuntu 23.10:
   linux-image-6.5.0-1009-azure    6.5.0-1009.9
   linux-image-6.5.0-1009-azure-fde  6.5.0-1009.9
   linux-image-azure               6.5.0.1009.11
   linux-image-azure-fde           6.5.0.1009.11

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-6572-1

CVE-2023-31085, CVE-2023-4244, CVE-2023-5090, CVE-2023-5345,

CVE-2023-5633

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6572-1

Topics%20covered

Topics Covered

security advisory denial of service kernel ubuntu system crash azure

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/6.5.0-1009.9

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