1. Ubuntu Security Notices
  2. USN-6495-2

USN-6495-2: Linux kernel vulnerabilities

Publication date

30 November 2023

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gkeop - Linux kernel for Google Container Engine (GKE) 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)

Manfred Rudigier discovered that the Intel(R) PCI-Express Gigabit (igb)
Ethernet driver in the Linux kernel did not properly validate received
frames that are larger than the set MTU size, leading to a buffer overflow
vulnerability. An attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2023-45871)

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)

Manfred Rudigier discovered that the Intel(R) PCI-Express Gigabit (igb)
Ethernet driver in the Linux kernel did not properly validate received
frames that are larger than the set MTU size, leading to a buffer overflow
vulnerability. An attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2023-45871)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
20.04 focal linux-image-5.4.0-1081-gkeop –  5.4.0-1081.85
linux-image-5.4.0-1118-gcp –  5.4.0-1118.127
linux-image-5.4.0-1120-azure –  5.4.0-1120.127
linux-image-azure-lts-20.04 –  5.4.0.1120.113
linux-image-gcp-lts-20.04 –  5.4.0.1118.120
linux-image-gkeop –  5.4.0.1081.79
linux-image-gkeop-5.4 –  5.4.0.1081.79
18.04 bionic linux-image-5.4.0-1118-gcp –  5.4.0-1118.127~18.04.1  
linux-image-5.4.0-1120-azure –  5.4.0-1120.127~18.04.1  
linux-image-azure –  5.4.0.1120.93  
linux-image-gcp –  5.4.0.1118.94  

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References

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