CWE
416 362
Advisory Published

USN-5687-1: Linux kernel (Azure) vulnerabilities

First published: Tue Oct 18 2022(Updated: )

It was discovered that the SUNRPC RDMA protocol implementation in the Linux kernel did not properly calculate the header size of a RPC message payload. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2022-0812) 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) 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) 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)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-4.15.0-1153-azure<4.15.0-1153.168
4.15.0-1153.168
=18.04
All of
ubuntu/linux-image-azure-lts-18.04<4.15.0.1153.123
4.15.0.1153.123
=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 CVE-2022-0812.

  • What is the severity of CVE-2022-0812?

    The severity of CVE-2022-0812 is not specified in the provided information.

  • How does CVE-2022-0812 affect the Linux kernel?

    CVE-2022-0812 allows a local attacker to expose sensitive information from kernel memory by exploiting a vulnerability in the SUNRPC RDMA protocol implementation.

  • How can I fix CVE-2022-0812 on Ubuntu 18.04 with Azure kernel version 4.15.0-1153.168?

    To fix CVE-2022-0812 on Ubuntu 18.04 with Azure kernel version 4.15.0-1153.168, update the 'linux-image-4.15.0-1153-azure' package to version 4.15.0-1153.168 or higher.

  • Are there any references for CVE-2022-0812?

    Yes, you can find more information about CVE-2022-0812 at the following references: [1](https://ubuntu.com/security/CVE-2022-26365), [2](https://ubuntu.com/security/CVE-2022-32296), [3](https://ubuntu.com/security/CVE-2022-1012).

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