CWE
416
Advisory Published

USN-5094-2: Linux kernel (Raspberry Pi) vulnerabilities

First published: Thu Sep 30 2021(Updated: )

It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly perform reference counting in some situations, leading to a use-after-free vulnerability. An attacker who could start and control a VM could possibly use this to expose sensitive information or execute arbitrary code. (CVE-2021-22543) 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) Alois Wohlschlager discovered that the overlay file system in the Linux kernel did not restrict private clones in some situations. An attacker could use this to expose sensitive information. (CVE-2021-3732) 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) It was discovered that the Xilinx 10/100 Ethernet Lite device driver in the Linux kernel could report pointer addresses in some situations. An attacker could use this information to ease the exploitation of another vulnerability. (CVE-2021-38205)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-4.15.0-1096-raspi2<4.15.0-1096.102
4.15.0-1096.102
=18.04
All of
ubuntu/linux-image-raspi2<4.15.0.1096.94
4.15.0.1096.94
=18.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID?

    The vulnerability ID is USN-5094-2.

  • What is the impact of USN-5094-2?

    The impact of USN-5094-2 is a use-after-free vulnerability in the Linux kernel KVM hypervisor implementation.

  • Who is affected by USN-5094-2?

    Users of Ubuntu 18.04 with the Linux kernel version 4.15.0-1096.102 or lower on Raspberry Pi are affected by USN-5094-2.

  • How can an attacker exploit USN-5094-2?

    An attacker who can start and control a virtual machine can exploit USN-5094-2 to expose sensitive information or execute arbitrary code.

  • How can I fix USN-5094-2?

    To fix USN-5094-2, update the Linux kernel to version 4.15.0-1096.102 or higher.

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