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Ubuntu 20.04 LTS USN-6648-2 Moderate: Kernel System Crash Risks

ubuntu
Calendar Grey February 28, 2024
Dist Ubuntu Esm H88
The Linux kernel for Ubuntu running on Azure has undergone a number of security patches. It is strongly advisable to apply these essential updates.
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-azure-5.4: Linux kernel for Microsoft Azure cloud systems

Details:

It was discovered that a race condition existed in the AppleTalk networking

subsystem of the Linux kernel, leading to a use-after-free vulnerability. A

local attacker could use this to cause a denial of service (system crash)

or possibly execute arbitrary code. (CVE-2023-51781)

Zhenghan Wang discovered that the generic ID allocator implementation in

the Linux kernel did not properly check for null bitmap when releasing IDs.

A local attacker could use this to cause a denial of service (system

crash). (CVE-2023-6915)

Robert Morris discovered that the CIFS network file system implementation

in the Linux kernel did not properly validate certain server commands

fields, leading to an out-of-bounds read vulnerability. An attacker could

use this to cau...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical doS kernel system crash linux-azure

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1124-azure    5.4.0-1124.131
   linux-image-azure-lts-20.04     5.4.0.1124.117

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-5.4.0-1124-azure    5.4.0-1124.131~18.04.1
   linux-image-azure               5.4.0.1124.97

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-6648-2

https://ubuntu.com/security/notices/USN-6648-1

CVE-2023-51781, CVE-2023-6915, CVE-2024-0565, CVE-2024-0646

Ubuntu Security Notice USN-6648-2

Topics%20covered

Topics Covered

security advisory critical doS kernel system crash linux-azure

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1124.131

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