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Ubuntu 20.04 LTS USN-6441-3 Critical: Kernel Buffer Overflow

ubuntu
Calendar Grey October 30, 2023
Dist Ubuntu Esm H88
Numerous vulnerabilities identified in Ubuntu's Linux kernel necessitate urgent measures to avert possible exploits and system failures.
Several security issues were fixed in the Linux kernel.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS (Available with Ubuntu Pro) Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-iot: Linux kernel for IoT platforms - linux-raspi: Linux kernel for Raspberry Pi systems - linux-raspi-5.4: Linux kernel for Raspberry Pi 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 execu...

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Topics%20covered

Topics Covered

security advisory buffer overflow critical kernel ubuntu dos

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: linux-image-5.4.0-1024-iot 5.4.0-1024.25 linux-image-5.4.0-1096-raspi 5.4.0-1096.107 linux-image-raspi 5.4.0.1096.126 linux-image-raspi2 5.4.0.1096.126 Ubuntu 18.04 LTS (Available with Ubuntu Pro): linux-image-5.4.0-1096-raspi 5.4.0-1096.107~18.04.1 linux-image-raspi-hwe-18.04 5.4.0.1096.93 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-6441-3

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
High
Critical

Ubuntu Security Notice USN-6441-3

Topics%20covered

Topics Covered

security advisory buffer overflow critical kernel ubuntu dos

Package Information

https://launchpad.net/ubuntu/+source/linux-iot/5.4.0-1024.25 https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1096.107

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