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Ubuntu 20.04 LTS USN-6446-2 Critical: Kernel Buffer Overflow

ubuntu
Calendar Grey October 24, 2023
Dist Ubuntu Esm H88
Addressed vulnerabilities in Ubuntu concerning the Linux Kernel. Safeguard your device from possible risks.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gcp-5.15: Linux kernel for Google Cloud Platform (GCP) systems

- linux-gkeop-5.15: Linux kernel for Google Container Engine (GKE) 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)

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)

Kyle Zeng discovered that the networking stack implementation in the Linux

kernel did not properly validate skb object size in ce...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow kernel system update ubuntu

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.15.0-1031-gkeop   5.15.0-1031.37~20.04.1
   linux-image-5.15.0-1045-gcp     5.15.0-1045.53~20.04.2
   linux-image-gcp                 5.15.0.1045.53~20.04.1
   linux-image-gkeop-5.15          5.15.0.1031.37~20.04.27

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-6446-2

https://ubuntu.com/security/notices/USN-6446-1

CVE-2023-34319, CVE-2023-4244, CVE-2023-42752, CVE-2023-42753,

CVE-2023-42755, CVE-2023-42756, CVE-2023-4622, CVE-2023-4623,

CVE-2023-4881, CVE-2023-4921, CVE-2023-5197

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6446-2

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow kernel system update ubuntu

Package Information

https://launchpad.net/ubuntu/+source/linux-gcp-5.15/5.15.0-1045.53~20.04.2
https://launchpad.net/ubuntu/+source/linux-gkeop-5.15/5.15.0-1031.37~20.04.1

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