CWE
416
Advisory Published

USN-5106-1: Linux kernel (OEM) vulnerabilities

First published: Wed Oct 06 2021(Updated: )

Valentina Palmiotti discovered that the io_uring subsystem in the Linux kernel could be coerced to free adjacent memory. A local attacker could use this to execute arbitrary code. (CVE-2021-41073) It was discovered that the Linux kernel did not properly enforce certain types of entries in the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism. An attacker could use this to bypass UEFI Secure Boot restrictions. (CVE-2020-26541) 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) Murray McAllister discovered that the joystick device interface in the Linux kernel did not properly validate data passed via an ioctl(). A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code on systems with a joystick device registered. (CVE-2021-3612) 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)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-oem-20.04b<5.10.0.1049.51
5.10.0.1049.51
=20.04
All of
ubuntu/linux-image-oem-20.04<5.10.0.1049.51
5.10.0.1049.51
=20.04
All of
ubuntu/linux-image-5.10.0-1049-oem<5.10.0-1049.51
5.10.0-1049.51
=20.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of CVE-2021-41073?

    The severity of CVE-2021-41073 is high.

  • How does CVE-2021-41073 work?

    CVE-2021-41073 is a vulnerability in the io_uring subsystem of the Linux kernel that allows a local attacker to execute arbitrary code by coercing the system to free adjacent memory.

  • Which versions of Linux kernel are affected by CVE-2021-41073?

    Linux kernel versions up to and including 5.10.0-1049.51 are affected by CVE-2021-41073.

  • How can I fix CVE-2021-41073?

    To fix CVE-2021-41073, update your Linux kernel to version 5.10.0-1049.51 or later.

  • Where can I find more information about CVE-2021-41073?

    You can find more information about CVE-2021-41073 on the Ubuntu Security Notices website: [link](https://ubuntu.com/security/CVE-2021-41073)

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