USN-4977-1: Linux kernel vulnerabilities

Published Jun 3, 2021
·
Updated

Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel contained a reference counting error. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-25670) Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly deallocate memory in certain error situations. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2020-25671, CVE-2020-25672) Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly handle error conditions in some situations, leading to an infinite loop. A local attacker could use this to cause a denial of service. (CVE-2020-25673) Piotr Krysiuk and Benedict Schlueter discovered that the eBPF implementation in the Linux kernel performed out of bounds speculation on pointer arithmetic. A local attacker could use this to expose sensitive information. (CVE-2021-29155) Reiji Watanabe discovered that the KVM VMX implementation in the Linux kernel did not properly prevent user space from tampering with an array index value, leading to a potential out-of-bounds write. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-3501)

Affected Software

49 affected componentsFixes available
Ubuntu Linux kernel
All of the following
ubuntu/linux-image-5.11.0-1006-azure<5.11.0-1006.6
5.11.0-1006.6
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-5.11.0-1007-oracle<5.11.0-1007.7
5.11.0-1007.7
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-5.11.0-1008-aws<5.11.0-1008.8
5.11.0-1008.8
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-5.11.0-1008-gcp<5.11.0-1008.9
5.11.0-1008.9
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-5.11.0-1008-kvm<5.11.0-1008.8
5.11.0-1008.8
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-5.11.0-1009-raspi<5.11.0-1009.10
5.11.0-1009.10
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-5.11.0-1009-raspi-nolpae<5.11.0-1009.10
5.11.0-1009.10
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-5.11.0-18-generic<5.11.0-18.19
5.11.0-18.19
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-5.11.0-18-generic-64k<5.11.0-18.19
5.11.0-18.19
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-5.11.0-18-generic-lpae<5.11.0-18.19
5.11.0-18.19
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-5.11.0-18-lowlatency<5.11.0-18.19
5.11.0-18.19
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-aws<5.11.0.1008.8
5.11.0.1008.8
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-azure<5.11.0.1006.6
5.11.0.1006.6
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-gcp<5.11.0.1008.8
5.11.0.1008.8
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-generic<5.11.0.18.19
5.11.0.18.19
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-generic-64k<5.11.0.18.19
5.11.0.18.19
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-generic-lpae<5.11.0.18.19
5.11.0.18.19
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-gke<5.11.0.1008.8
5.11.0.1008.8
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-kvm<5.11.0.1008.8
5.11.0.1008.8
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-lowlatency<5.11.0.18.19
5.11.0.18.19
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-oracle<5.11.0.1007.7
5.11.0.1007.7
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-raspi<5.11.0.1009.7
5.11.0.1009.7
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-raspi-nolpae<5.11.0.1009.7
5.11.0.1009.7
Ubuntu Ubuntu=21.04
All of the following
ubuntu/linux-image-virtual<5.11.0.18.19
5.11.0.18.19
Ubuntu Ubuntu=21.04

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/linux-image-5.11.0-1006-azure to a version that resolves this vulnerability.

    Fixed in 5.11.0-1006.6
  2. Upgrade

    Upgrade ubuntu/linux-image-5.11.0-1007-oracle to a version that resolves this vulnerability.

    Fixed in 5.11.0-1007.7
  3. Upgrade

    Upgrade ubuntu/linux-image-5.11.0-1008-aws to a version that resolves this vulnerability.

    Fixed in 5.11.0-1008.8
  4. Upgrade

    Upgrade ubuntu/linux-image-5.11.0-1008-gcp to a version that resolves this vulnerability.

    Fixed in 5.11.0-1008.9
  5. Upgrade

    Upgrade ubuntu/linux-image-5.11.0-1008-kvm to a version that resolves this vulnerability.

    Fixed in 5.11.0-1008.8
  6. Upgrade

    Upgrade ubuntu/linux-image-5.11.0-1009-raspi to a version that resolves this vulnerability.

    Fixed in 5.11.0-1009.10
  7. Upgrade

    Upgrade ubuntu/linux-image-5.11.0-1009-raspi-nolpae to a version that resolves this vulnerability.

    Fixed in 5.11.0-1009.10
  8. Upgrade

    Upgrade ubuntu/linux-image-5.11.0-18-generic to a version that resolves this vulnerability.

    Fixed in 5.11.0-18.19
  9. Upgrade

    Upgrade ubuntu/linux-image-5.11.0-18-generic-64k to a version that resolves this vulnerability.

    Fixed in 5.11.0-18.19
  10. Upgrade

    Upgrade ubuntu/linux-image-5.11.0-18-generic-lpae to a version that resolves this vulnerability.

    Fixed in 5.11.0-18.19
  11. Upgrade

    Upgrade ubuntu/linux-image-5.11.0-18-lowlatency to a version that resolves this vulnerability.

    Fixed in 5.11.0-18.19
  12. Upgrade

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

    Fixed in 5.11.0.1008.8
  13. Upgrade

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

    Fixed in 5.11.0.1006.6
  14. Upgrade

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

    Fixed in 5.11.0.1008.8
  15. Upgrade

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

    Fixed in 5.11.0.18.19
  16. Upgrade

    Upgrade ubuntu/linux-image-generic-64k to a version that resolves this vulnerability.

    Fixed in 5.11.0.18.19
  17. Upgrade

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

    Fixed in 5.11.0.18.19
  18. Upgrade

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

    Fixed in 5.11.0.1008.8
  19. Upgrade

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

    Fixed in 5.11.0.1008.8
  20. Upgrade

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

    Fixed in 5.11.0.18.19
  21. Upgrade

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

    Fixed in 5.11.0.1007.7
  22. Upgrade

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

    Fixed in 5.11.0.1009.7
  23. Upgrade

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

    Fixed in 5.11.0.1009.7
  24. Upgrade

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

    Fixed in 5.11.0.18.19

Event History

Jun 3, 2021
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-2020-25670?

The severity of CVE-2020-25670 is high.

2

How does CVE-2020-25670 impact the system?

CVE-2020-25670 can cause a denial of service (system crash).

3

How do I fix CVE-2020-25670?

To fix CVE-2020-25670, update the Linux kernel to version 5.11.0-1006.6 or later.

4

What is the severity of CVE-2021-3501?

The severity of CVE-2021-3501 is high.

5

How does CVE-2021-3501 impact the system?

CVE-2021-3501 can allow an attacker to execute arbitrary code or escalate privileges.

6

How do I fix CVE-2021-3501?

To fix CVE-2021-3501, update the Linux kernel to the latest available version.

Company

Resources

Contact

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