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Ubuntu 18.04 LTS USN-6441-2: Critical Kernel Issues Resolved

ubuntu
Calendar Grey October 23, 2023
Dist Ubuntu Esm H88
Numerous vulnerabilities resolved in Ubuntu 18.04 LTS kernel for Google Cloud impacting system reliability and efficiency.
Several security issues were fixed in the Linux kernel.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS (Available with Ubuntu Pro) Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems Details: Ross Lagerwall discovered that the Xen netback backend driver in the Linux kernel did not properly handle certain unusual packets from a paravirtualized network frontend, leading to a buffer overflow. An attacker in a guest VM could use this to cause a denial of service (host system crash) or possibly execute arbitrary code. (CVE-2023-34319) Kyle Zeng discovered that the networking stack implementation in the Linux kernel did not properly validate skb object size in certain conditions. An attacker could use this cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-42752) Kyle Zeng discovered that the netfiler subsystem in the Linux kerne...

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Topics%20covered

Topics Covered

security advisory denial of service network security buffer overflow Ubuntu kernel issues

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-5.4.0-1116-gcp 5.4.0-1116.125~18.04.1 linux-image-gcp 5.4.0.1116.92 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-6441-2

https://ubuntu.com/security/notices/USN-6441-1

CVE-2023-34319, CVE-2023-42752, CVE-2023-42753, CVE-2023-42755,

CVE-2023-42756, CVE-2023-4622, CVE-2023-4623, CVE-2023-4881,

CVE-2023-4921

Severity
critical
Lowest
Low
Medium
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Critical

Ubuntu Security Notice USN-6441-2

Topics%20covered

Topics Covered

security advisory denial of service network security buffer overflow Ubuntu kernel issues

Package Information

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