CWE
416 362
Advisory Published

USN-5706-1: Linux kernel (Azure CVM) vulnerabilities

First published: Thu Oct 27 2022(Updated: )

It was discovered that the BPF verifier in the Linux kernel did not properly handle internal data structures. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-4159) It was discovered that an out-of-bounds write vulnerability existed in the Video for Linux 2 (V4L2) implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2022-20369) Duoming Zhou discovered that race conditions existed in the timer handling implementation of the Linux kernel's Rose X.25 protocol layer, resulting in use-after-free vulnerabilities. A local attacker could use this to cause a denial of service (system crash). (CVE-2022-2318) Roger Pau Monné discovered that the Xen virtual block driver in the Linux kernel did not properly initialize memory pages to be used for shared communication with the backend. A local attacker could use this to expose sensitive information (guest kernel memory). (CVE-2022-26365) Pawan Kumar Gupta, Alyssa Milburn, Amit Peled, Shani Rehana, Nir Shildan and Ariel Sabba discovered that some Intel processors with Enhanced Indirect Branch Restricted Speculation (eIBRS) did not properly handle RET instructions after a VM exits. A local attacker could potentially use this to expose sensitive information. (CVE-2022-26373) Eric Biggers discovered that a use-after-free vulnerability existed in the io_uring subsystem in the Linux kernel. A local attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2022-3176) Roger Pau Monné discovered that the Xen paravirtualization frontend in the Linux kernel did not properly initialize memory pages to be used for shared communication with the backend. A local attacker could use this to expose sensitive information (guest kernel memory). (CVE-2022-33740) It was discovered that the Xen paravirtualization frontend in the Linux kernel incorrectly shared unrelated data when communicating with certain backends. A local attacker could use this to cause a denial of service (guest crash) or expose sensitive information (guest kernel memory). (CVE-2022-33741, CVE-2022-33742) Oleksandr Tyshchenko discovered that the Xen paravirtualization platform in the Linux kernel on ARM platforms contained a race condition in certain situations. An attacker in a guest VM could use this to cause a denial of service in the host OS. (CVE-2022-33744) It was discovered that the Netlink Transformation (XFRM) subsystem in the Linux kernel contained a reference counting error. A local attacker could use this to cause a denial of service (system crash). (CVE-2022-36879)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-azure-fde<5.4.0.1092.97+cvm1.32
5.4.0.1092.97+cvm1.32
=20.04
All of
ubuntu/linux-image-5.4.0-1092-azure-fde<5.4.0-1092.97+cvm1.1
5.4.0-1092.97+cvm1.1
=20.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-5706-1?

    The severity of USN-5706-1 is high.

  • How can a local attacker exploit CVE-2021-4159?

    A local attacker can exploit CVE-2021-4159 by using an improper handling of internal data structures in the BPF verifier to expose sensitive information (kernel memory).

  • What is the remedy for the linux-image-azure-fde package version 5.4.0.1092.97+cvm1.32?

    The remedy for the linux-image-azure-fde package version 5.4.0.1092.97+cvm1.32 is to update it to version 5.4.0.1092.97+cvm1.32 or later.

  • What is the remedy for the linux-image-5.4.0-1092-azure-fde package version 5.4.0-1092.97+cvm1.1?

    The remedy for the linux-image-5.4.0-1092-azure-fde package version 5.4.0-1092.97+cvm1.1 is to update it to version 5.4.0-1092.97+cvm1.1 or later.

  • What are the Common Weakness Enumerations (CWEs) associated with USN-5706-1?

    The Common Weakness Enumerations (CWEs) associated with USN-5706-1 are CWE-416 (Use After Free) and CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')).

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