CWE
119 190 416
Advisory Published

USN-5794-1: Linux kernel (AWS) vulnerabilities

First published: Fri Jan 06 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-4.4.0-1153-aws<4.4.0-1153.168
4.4.0-1153.168
=16.04
All of
ubuntu/linux-image-aws<4.4.0.1153.157
4.4.0.1153.157
=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-5794-1?

    The severity of USN-5794-1 is high.

  • How does the NFSD implementation vulnerability (CVE-2022-43945) affect Linux kernel (AWS)?

    The NFSD implementation vulnerability in the Linux kernel (AWS) allows remote attackers to cause a denial of service or possibly execute arbitrary code.

  • Which versions of Ubuntu are affected by USN-5794-1?

    Ubuntu 16.04 with kernel versions 4.4.0-1153.168 and 4.4.0.1153.157 are affected by USN-5794-1.

  • How can I fix the NFSD implementation vulnerability in Linux kernel (AWS)?

    To fix the NFSD implementation vulnerability in Linux kernel (AWS), update to kernel version 4.4.0-1153.168 for `linux-image-4.4.0-1153-aws` package or kernel version 4.4.0.1153.157 for `linux-image-aws` package.

  • Where can I find more information about the vulnerabilities in USN-5794-1?

    You can find more information about the vulnerabilities in USN-5794-1 on the Ubuntu security advisory pages: CVE-2022-42896, CVE-2022-45934, CVE-2022-3643.

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