CWE
119 190 416
Advisory Published

USN-5813-1: Linux kernel vulnerabilities

First published: Thu Jan 19 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-gkeop-5.4<5.4.0.1062.60
5.4.0.1062.60
=20.04
All of
ubuntu/linux-image-gkeop<5.4.0.1062.60
5.4.0.1062.60
=20.04
All of
ubuntu/linux-image-5.4.0-1062-gkeop<5.4.0-1062.66
5.4.0-1062.66
=20.04
All of
ubuntu/linux-image-5.4.0-1094-aws<5.4.0-1094.102~18.04.1
5.4.0-1094.102~18.04.1
=18.04
All of
ubuntu/linux-image-generic-hwe-18.04<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
=18.04
All of
ubuntu/linux-image-snapdragon-hwe-18.04<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
=18.04
All of
ubuntu/linux-image-5.4.0-137-generic<5.4.0-137.154~18.04.1
5.4.0-137.154~18.04.1
=18.04
All of
ubuntu/linux-image-oem<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
=18.04
All of
ubuntu/linux-image-aws<5.4.0.1094.72
5.4.0.1094.72
=18.04
All of
ubuntu/linux-image-5.4.0-137-lowlatency<5.4.0-137.154~18.04.1
5.4.0-137.154~18.04.1
=18.04
All of
ubuntu/linux-image-oem-osp1<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
=18.04
All of
ubuntu/linux-image-generic-lpae-hwe-18.04<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
=18.04
All of
ubuntu/linux-image-oracle-lts-18.04<4.15.0.1113.118
4.15.0.1113.118
=18.04
All of
ubuntu/linux-image-snapdragon<4.15.0.1144.143
4.15.0.1144.143
=18.04
All of
ubuntu/linux-image-virtual-hwe-18.04<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
=18.04
All of
ubuntu/linux-image-4.15.0-1113-oracle<4.15.0-1113.124
4.15.0-1113.124
=18.04
All of
ubuntu/linux-image-4.15.0-1144-snapdragon<4.15.0-1144.154
4.15.0-1144.154
=18.04
All of
ubuntu/linux-image-5.4.0-137-generic-lpae<5.4.0-137.154~18.04.1
5.4.0-137.154~18.04.1
=18.04
All of
ubuntu/linux-image-lowlatency-hwe-18.04<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
=18.04
All of
ubuntu/linux-image-4.15.0-1113-oracle<4.15.0-1113.124~16.04.1
4.15.0-1113.124~16.04.1
=16.04
All of
ubuntu/linux-image-oracle<4.15.0.1113.95
4.15.0.1113.95
=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of CVE-2022-43945?

    The severity of CVE-2022-43945 is high.

  • How can a remote attacker exploit CVE-2022-43945?

    A remote attacker can exploit CVE-2022-43945 by sending malicious RPC messages, leading to a buffer overflow and potentially causing a denial of service or executing arbitrary code.

  • Which versions of Ubuntu are affected by CVE-2022-43945?

    Ubuntu versions 20.04, 18.04, and 16.04 are affected by CVE-2022-43945.

  • What is the recommended remedy for CVE-2022-43945?

    To fix CVE-2022-43945, it is recommended to update to Linux kernel version 5.4.0.1062.60 or later.

  • Where can I find more information about CVE-2022-43945?

    More information about CVE-2022-43945 can be found at the Ubuntu security advisory: https://ubuntu.com/security/CVE-2022-43945

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