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Ubuntu: 6135-1 Critical Update on Linux Kernel Issues for Azure CVM

ubuntu
Calendar Grey June 2, 2023
Dist Ubuntu Esm H88
Important vulnerability patches implemented in the Linux core for Ubuntu impacting Azure virtual machines. Ensure timely updates for security enhancement!
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure-fde: Linux kernel for Microsoft Azure CVM cloud systems

- linux-azure-fde-5.15: Linux kernel for Microsoft Azure CVM cloud systems

Details:

Patryk Sondej and Piotr Krysiuk discovered that a race condition existed in

the netfilter subsystem of the Linux kernel when processing batch requests,

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-2023-32233)

Gwangun Jung discovered that the Quick Fair Queueing scheduler

implementation in the Linux kernel contained an out-of-bounds write

vulnerability. A local attacker could use this to cause a denial of service

(system crash) or possibly execute arbitrary code. (CVE-2023-31436)

Reima Ishii discovered that the nested KVM implementation for Intel x86

processors in the Linux kernel did not properly validate control re...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory security issue kernel update Ubuntu system crash Azure CVM

Update Instructions

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

Ubuntu 22.04 LTS:
   linux-image-5.15.0-1039-azure-fde  5.15.0-1039.46.1
   linux-image-azure-fde           5.15.0.1039.46.16

Ubuntu 20.04 LTS:
   linux-image-5.15.0-1039-azure-fde  5.15.0-1039.46~20.04.1.1
   linux-image-azure-fde           5.15.0.1039.46~20.04.1.18

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-6135-1

CVE-2023-1380, CVE-2023-2612, CVE-2023-30456, CVE-2023-31436,

CVE-2023-32233

Severity
critical
Lowest
Low
Medium
High
Critical

June 02, 2023

Topics%20covered

Topics Covered

security advisory security issue kernel update Ubuntu system crash Azure CVM

Package Information

https://launchpad.net/ubuntu/+source/linux-azure-fde/5.15.0-1039.46.1
https://launchpad.net/ubuntu/+source/linux-azure-fde-5.15/5.15.0-1039.46~20.04.1.1

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