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Ubuntu 20.04 LTS USN-6387-2 Critical: Kernel Denial Of Service

ubuntu
Calendar Grey September 26, 2023
Dist Ubuntu Esm H88
Tackling a range of vulnerabilities in the Ubuntu kernel's operations to strengthen overall system security and ensure reliable performance.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-bluefield: Linux kernel for NVIDIA BlueField platforms

- linux-raspi: Linux kernel for Raspberry Pi systems

- linux-raspi-5.4: Linux kernel for Raspberry Pi systems

Details:

Jana Hofmann, Emanuele Vannacci, Cedric Fournet, Boris Kopf, and Oleksii

Oleksenko discovered that some AMD processors could leak stale data from

division operations in certain situations. A local attacker could possibly

use this to expose sensitive information. (CVE-2023-20588)

It was discovered that the bluetooth subsystem in the Linux kernel did not

properly handle L2CAP socket release, 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-2023-40283)

It was discovered that some network classifier implementations in the Linux

kernel contained use-after-free vulnerabilities. A local attacker cou...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service security issue critical Ubuntu kernel bluefield

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1071-bluefield  5.4.0-1071.77
   linux-image-5.4.0-1094-raspi    5.4.0-1094.105
   linux-image-bluefield           5.4.0.1071.66
   linux-image-raspi               5.4.0.1094.124
   linux-image-raspi2              5.4.0.1094.124

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-5.4.0-1094-raspi    5.4.0-1094.105~18.04.1
   linux-image-raspi-hwe-18.04     5.4.0.1094.91

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-6387-2

https://ubuntu.com/security/notices/USN-6387-1

CVE-2023-20588, CVE-2023-40283, CVE-2023-4128

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6387-2

Topics%20covered

Topics Covered

security advisory denial of service security issue critical Ubuntu kernel bluefield

Package Information

https://launchpad.net/ubuntu/+source/linux-bluefield/5.4.0-1071.77
https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1094.105

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