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Ubuntu 18.04 LTS USN-6494-2: Critical Kernel Issues Causing DoS

ubuntu
Calendar Grey November 30, 2023
Dist Ubuntu Esm H88
Various vulnerabilities rectified in the Linux kernel for Ubuntu, affecting deployments on GCP and Azure.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure-4.15: Linux kernel for Microsoft Azure Cloud systems

- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) 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)

Lucas Leong discovered that the netfilter subsystem in the Linux kernel did

not properly validate some attributes passed from userspace. A local

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

possibly expose sensitive information (kernel memory). (CVE-2023-39189)

Sunjoo Park discovered that the netfilter subsystem in the Linux kernel did

not properly...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update instructions ubuntu system crash

Update Instructions

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1157-gcp     4.15.0-1157.174
   linux-image-4.15.0-1172-azure   4.15.0-1172.187
   linux-image-azure-lts-18.04     4.15.0.1172.140
   linux-image-gcp-lts-18.04       4.15.0.1157.171

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1157-gcp     4.15.0-1157.174~16.04.1
   linux-image-4.15.0-1172-azure   4.15.0-1172.187~16.04.1
   linux-image-azure               4.15.0.1172.156
   linux-image-gcp                 4.15.0.1157.147
   linux-image-gke                 4.15.0.1157.147

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1172-azure   4.15.0-1172.187~14.04.1
   linux-image-azure               4.15.0.1172.138

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-6494-2

https://ubuntu.com/security/notices/USN-6494-1

CVE-2023-31085, CVE-2023-39189, CVE-2023-39192, CVE-2023-39193,

CVE-2023-39194, CVE-2023-42754, CVE-2023-45862, CVE-2023-45871,

CVE-2023-5717

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6494-2

Topics%20covered

Topics Covered

security advisory denial of service kernel update instructions ubuntu system crash

Package Information

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