CWE
416 362
Advisory Published

USN-5639-1: Linux kernel (Azure CVM) vulnerabilities

First published: Mon Sep 26 2022(Updated: )

It was discovered that the framebuffer driver on the Linux kernel did not verify size limits when changing font or screen size, leading to an out-of- bounds write. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33655) Moshe Kol, Amit Klein and Yossi Gilad discovered that the IP implementation in the Linux kernel did not provide sufficient randomization when calculating port offsets. An attacker could possibly use this to expose sensitive information. (CVE-2022-1012, CVE-2022-32296) Norbert Slusarek discovered that a race condition existed in the perf subsystem in the Linux kernel, resulting in a use-after-free vulnerability. A privileged local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2022-1729) It was discovered that the device-mapper verity (dm-verity) driver in the Linux kernel did not properly verify targets being loaded into the device- mapper table. A privileged attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2022-2503) Domingo Dirutigliano and Nicola Guerrera discovered that the netfilter subsystem in the Linux kernel did not properly handle rules that truncated packets below the packet header size. When such rules are in place, a remote attacker could possibly use this to cause a denial of service (system crash). (CVE-2022-36946)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-azure-fde<5.4.0.1091.96+cvm1.31
5.4.0.1091.96+cvm1.31
=20.04
All of
ubuntu/linux-image-5.4.0-1091-azure-fde<5.4.0-1091.96+cvm1.1
5.4.0-1091.96+cvm1.1
=20.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this Linux kernel vulnerability?

    The vulnerability ID for this Linux kernel vulnerability is CVE-2021-33655.

  • What is the severity of CVE-2021-33655?

    The severity of CVE-2021-33655 is not mentioned in the provided information.

  • How does the Linux kernel vulnerability affect Ubuntu Ubuntu 20.04?

    The Linux kernel vulnerability affects Ubuntu Ubuntu 20.04.

  • How can a local attacker exploit CVE-2021-33655?

    A local attacker can exploit CVE-2021-33655 to cause a denial of service (system crash) or possibly execute arbitrary code.

  • How can I fix the Linux kernel vulnerability?

    To fix the Linux kernel vulnerability, update to version 5.4.0.1091.96+cvm1.31 or higher for linux-image-azure-fde package or version 5.4.0-1091.96+cvm1.1 or higher for linux-image-5.4.0-1091-azure-fde package.

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