USN-5813-1: Linux kernel vulnerabilities

Published 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 Software

43 affected componentsFixes available
Ubuntu Linux kernel
All of the following
ubuntu/linux-image-gkeop-5.4<5.4.0.1062.60
5.4.0.1062.60
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-gkeop<5.4.0.1062.60
5.4.0.1062.60
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-5.4.0-1062-gkeop<5.4.0-1062.66
5.4.0-1062.66
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-5.4.0-1094-aws<5.4.0-1094.102~18.04.1
5.4.0-1094.102~18.04.1
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-generic-hwe-18.04<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-snapdragon-hwe-18.04<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-5.4.0-137-generic<5.4.0-137.154~18.04.1
5.4.0-137.154~18.04.1
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-oem<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-aws<5.4.0.1094.72
5.4.0.1094.72
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-5.4.0-137-lowlatency<5.4.0-137.154~18.04.1
5.4.0-137.154~18.04.1
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-oem-osp1<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-generic-lpae-hwe-18.04<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-oracle-lts-18.04<4.15.0.1113.118
4.15.0.1113.118
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-snapdragon<4.15.0.1144.143
4.15.0.1144.143
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-virtual-hwe-18.04<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-4.15.0-1113-oracle<4.15.0-1113.124
4.15.0-1113.124
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-4.15.0-1144-snapdragon<4.15.0-1144.154
4.15.0-1144.154
Ubuntu Ubuntu=18.04
All of the following
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
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-lowlatency-hwe-18.04<5.4.0.137.154~18.04.112
5.4.0.137.154~18.04.112
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-4.15.0-1113-oracle<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/linux-image-oracle<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/linux-image-gkeop-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0.1062.60
  2. Upgrade

    Upgrade ubuntu/linux-image-gkeop to a version that resolves this vulnerability.

    Fixed in 5.4.0.1062.60
  3. Upgrade

    Upgrade ubuntu/linux-image-5.4.0-1062-gkeop to a version that resolves this vulnerability.

    Fixed in 5.4.0-1062.66
  4. Upgrade

    Upgrade ubuntu/linux-image-5.4.0-1094-aws to a version that resolves this vulnerability.

    Fixed in 5.4.0-1094.102~18.04.1
  5. Upgrade

    Upgrade ubuntu/linux-image-generic-hwe-18.04 to a version that resolves this vulnerability.

    Fixed in 5.4.0.137.154~18.04.112
  6. Upgrade

    Upgrade ubuntu/linux-image-snapdragon-hwe-18.04 to a version that resolves this vulnerability.

    Fixed in 5.4.0.137.154~18.04.112
  7. Upgrade

    Upgrade ubuntu/linux-image-5.4.0-137-generic to a version that resolves this vulnerability.

    Fixed in 5.4.0-137.154~18.04.1
  8. Upgrade

    Upgrade ubuntu/linux-image-oem to a version that resolves this vulnerability.

    Fixed in 5.4.0.137.154~18.04.112
  9. Upgrade

    Upgrade ubuntu/linux-image-aws to a version that resolves this vulnerability.

    Fixed in 5.4.0.1094.72
  10. Upgrade

    Upgrade ubuntu/linux-image-5.4.0-137-lowlatency to a version that resolves this vulnerability.

    Fixed in 5.4.0-137.154~18.04.1
  11. Upgrade

    Upgrade ubuntu/linux-image-oem-osp1 to a version that resolves this vulnerability.

    Fixed in 5.4.0.137.154~18.04.112
  12. Upgrade

    Upgrade ubuntu/linux-image-generic-lpae-hwe-18.04 to a version that resolves this vulnerability.

    Fixed in 5.4.0.137.154~18.04.112
  13. Upgrade

    Upgrade ubuntu/linux-image-oracle-lts-18.04 to a version that resolves this vulnerability.

    Fixed in 4.15.0.1113.118
  14. Upgrade

    Upgrade ubuntu/linux-image-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.15.0.1144.143
  15. Upgrade

    Upgrade ubuntu/linux-image-virtual-hwe-18.04 to a version that resolves this vulnerability.

    Fixed in 5.4.0.137.154~18.04.112
  16. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-1113-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1113.124
  17. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-1144-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.15.0-1144.154
  18. Upgrade

    Upgrade ubuntu/linux-image-5.4.0-137-generic-lpae to a version that resolves this vulnerability.

    Fixed in 5.4.0-137.154~18.04.1
  19. Upgrade

    Upgrade ubuntu/linux-image-lowlatency-hwe-18.04 to a version that resolves this vulnerability.

    Fixed in 5.4.0.137.154~18.04.112
  20. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-1113-oracle to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  21. Upgrade

    Upgrade ubuntu/linux-image-oracle to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro

Event History

Jan 19, 2023
Advisory Published
via Ubuntu·12:00 AM
Data Sourced
via Ubuntu·12:00 AM
DescriptionAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2022-43945?

The severity of CVE-2022-43945 is high.

2

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.

3

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.

4

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.

5

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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