CWE
119 190 416
Advisory Published

USN-5830-1: Linux kernel vulnerabilities

First published: Fri Jan 27 2023(Updated: )

It was discovered that the NFSD implementation in the Linux kernel did not properly handle some RPC messages, leading to a buffer overflow. A remote attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2022-43945) Tamás Koczka discovered that the Bluetooth L2CAP handshake implementation in the Linux kernel contained multiple use-after-free vulnerabilities. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2022-42896) It was discovered that the Xen netback driver in the Linux kernel did not properly handle packets structured in certain ways. An attacker in a guest VM could possibly use this to cause a denial of service (host NIC availability). (CVE-2022-3643) It was discovered that an integer overflow vulnerability existed in the Bluetooth subsystem in the Linux kernel. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2022-45934)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-5.4.0-1101-azure<5.4.0-1101.107
5.4.0-1101.107
=20.04
All of
ubuntu/linux-image-azure-lts-20.04<5.4.0.1101.94
5.4.0.1101.94
=20.04
All of
ubuntu/linux-image-azure<5.4.0.1101.74
5.4.0.1101.74
=18.04
All of
ubuntu/linux-image-4.15.0-1126-raspi2<4.15.0-1126.134
4.15.0-1126.134
=18.04
All of
ubuntu/linux-image-raspi2<4.15.0.1126.121
4.15.0.1126.121
=18.04
All of
ubuntu/linux-image-5.4.0-1101-azure<5.4.0-1101.107~18.04.1
5.4.0-1101.107~18.04.1
=18.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this advisory?

    CVE-2022-43945

  • What is the affected software version?

    Linux kernel versions 5.4.0-1101.107 and earlier

  • How can an attacker exploit this vulnerability?

    By sending malicious RPC messages to the system

  • How can I fix this vulnerability?

    Upgrade to Linux kernel version 5.4.0-1101.108 or later

  • Where can I find more information about this vulnerability?

    You can find more information about this vulnerability on the Ubuntu Security website.

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