[USN-6495-2] Linux kernel vulnerabilities

Rodrigo Figueiredo Zaiden rodrigo.zaiden at canonical.com
Thu Nov 30 18:32:03 UTC 2023

Ubuntu Security Notice USN-6495-2
November 30, 2023

linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gkeop

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)


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


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:

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

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

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.

   CVE-2023-31085, CVE-2023-45871

Package Information:

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