Advisory Published

USN-6387-2: Linux kernel vulnerabilities

First published: Tue Sep 26 2023(Updated: )

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 could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-4128)

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of CVE-2023-20588?

    The severity of CVE-2023-20588 is moderate.

  • How can a local attacker exploit CVE-2023-20588?

    A local attacker could exploit CVE-2023-20588 by leaking stale data from division operations on certain AMD processors.

  • What is the affected software for CVE-2023-20588?

    The affected software for CVE-2023-20588 is Ubuntu 20.04 with Linux kernel versions 5.4.0-1071.77, 5.4.0-1094.105,,, and

  • How can I fix CVE-2023-20588?

    To fix CVE-2023-20588, update your Ubuntu system to Linux kernel version 5.4.0-1071.77, 5.4.0-1094.105,,, or

  • Where can I find more information about CVE-2023-20588?

    You can find more information about CVE-2023-20588 on the Ubuntu website.


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