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Ubuntu 20.04 LTS USN-6495-2 critical: denial of service in Linux kernel

ubuntu
Calendar Grey November 30, 2023
Dist Ubuntu Esm H88
Ubuntu 22.04 and 20.04 LTS have received critical updates addressing multiple kernel weaknesses, enhancing system defense through essential security fixes.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

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

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

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

- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems

- linux-gcp-5.4: 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)

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 pos...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow Ubuntu system crash Linux kernel

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1081-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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   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

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-6495-2

https://ubuntu.com/security/notices/USN-6495-1

CVE-2023-31085, CVE-2023-45871

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6495-2

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow Ubuntu system crash Linux kernel

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1120.127
https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1118.127
https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1081.85

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