Advisory Published

USN-5091-2: Linux kernel (Raspberry Pi) vulnerabilities

First published: Thu Sep 30 2021(Updated: )

Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack. An attacker could use this to expose sensitive information. (CVE-2021-33624) It was discovered that the tracing subsystem in the Linux kernel did not properly keep track of per-cpu ring buffer state. A privileged attacker could use this to cause a denial of service. (CVE-2021-3679) It was discovered that the Virtio console implementation in the Linux kernel did not properly validate input lengths in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-38160) Michael Wakabayashi discovered that the NFSv4 client implementation in the Linux kernel did not properly order connection setup operations. An attacker controlling a remote NFS server could use this to cause a denial of service on the client. (CVE-2021-38199) It was discovered that the MAX-3421 host USB device driver in the Linux kernel did not properly handle device removal events. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2021-38204)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-raspi2<5.4.0.1044.79
5.4.0.1044.79
=20.04
All of
ubuntu/linux-image-raspi<5.4.0.1044.79
5.4.0.1044.79
=20.04
All of
ubuntu/linux-image-5.4.0-1044-raspi<5.4.0-1044.48
5.4.0-1044.48
=20.04
All of
ubuntu/linux-image-raspi-hwe-18.04<5.4.0.1044.47
5.4.0.1044.47
=18.04
All of
ubuntu/linux-image-5.4.0-1044-raspi<5.4.0-1044.48~18.04.1
5.4.0-1044.48~18.04.1
=18.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID of this advisory?

    The vulnerability ID of this advisory is CVE-2021-33624.

  • How can an attacker exploit this vulnerability?

    An attacker can exploit this vulnerability to expose sensitive information through a side-channel attack.

  • Which software versions are affected by this vulnerability?

    The affected software versions are linux-image-raspi2 5.4.0.1044.79, linux-image-raspi 5.4.0.1044.79, linux-image-5.4.0-1044-raspi 5.4.0-1044.48, linux-image-raspi-hwe-18.04 5.4.0.1044.47, and linux-image-5.4.0-1044-raspi 5.4.0-1044.48~18.04.1.

  • How do I fix this vulnerability?

    To fix this vulnerability, update the affected software to version 5.4.0.1044.79 for linux-image-raspi2, linux-image-raspi, and linux-image-5.4.0-1044-raspi, version 5.4.0.1044.47 for linux-image-raspi-hwe-18.04, and version 5.4.0-1044.48~18.04.1 for linux-image-5.4.0-1044-raspi.

  • Where can I find more information about this vulnerability?

    You can find more information about this vulnerability at the following references: [CVE-2021-3679](https://ubuntu.com/security/CVE-2021-3679), [CVE-2021-38160](https://ubuntu.com/security/CVE-2021-38160), [CVE-2021-33624](https://ubuntu.com/security/CVE-2021-33624).

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