CWE
119 190 416
Advisory Published

USN-5804-2: Linux kernel vulnerabilities

First published: Fri Jan 13 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-gcp-lts-18.04<4.15.0.1143.157
4.15.0.1143.157
=18.04
All of
ubuntu/linux-image-4.15.0-1143-gcp<4.15.0-1143.159
4.15.0-1143.159
=18.04
All of
ubuntu/linux-image-aws-lts-18.04<4.15.0.1148.146
4.15.0.1148.146
=18.04
All of
ubuntu/linux-image-4.15.0-1148-aws<4.15.0-1148.160
4.15.0-1148.160
=18.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-5804-2?

    The severity of USN-5804-2 is high.

  • How can a remote attacker exploit the vulnerability in USN-5804-2?

    A remote attacker can exploit the vulnerability in USN-5804-2 by sending specially crafted RPC messages to the NFSD implementation, causing a buffer overflow and potentially executing arbitrary code or causing a denial of service.

  • How do I fix USN-5804-2?

    To fix USN-5804-2, update the affected Linux kernel packages to the specified version or apply the recommended patches.

  • Which versions of Ubuntu are affected by USN-5804-2?

    USN-5804-2 affects Ubuntu 18.04.

  • Are there any references for USN-5804-2?

    Yes, you can find references for USN-5804-2 at the following links: [Link 1](https://ubuntu.com/security/CVE-2022-42896), [Link 2](https://ubuntu.com/security/CVE-2022-45934), [Link 3](https://ubuntu.com/security/CVE-2022-3643).

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