USN-4041-2: Linux kernel (HWE) update

Published Jun 29, 2019
·
Updated

USN-4041-1 provided updates for the Linux kernel in Ubuntu. This update provides the corresponding updates for the Linux kernel for Ubuntu 16.04 ESM. USN-4017-2 fixed vulnerabilities in the Linux kernel. Unfortunately, the update introduced a regression that interfered with networking applications that setup very low SOSNDBUF values. This update fixes the problem. We apologize for the inconvenience. Jonathan Looney discovered that the Linux kernel could be coerced into segmenting responses into multiple TCP segments. A remote attacker could construct an ongoing sequence of requests to cause a denial of service. (CVE-2019-11479)

Affected Software

39 affected componentsFixes available
Ubuntu Linux kernel (HWE)
All of the following
ubuntu/linux-image-powerpc-smp-lts-xenial<4.4.0.154.135
4.4.0.154.135
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-generic-lpae-lts-xenial<4.4.0.154.135
4.4.0.154.135
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-generic-lts-xenial<4.4.0.154.135
4.4.0.154.135
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-4.4.0-154-powerpc64-smp<4.4.0-154.181~14.04.1
4.4.0-154.181~14.04.1
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-4.4.0-154-generic-lpae<4.4.0-154.181~14.04.1
4.4.0-154.181~14.04.1
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-4.4.0-1048-aws<4.4.0-1048.52
4.4.0-1048.52
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-powerpc64-emb-lts-xenial<4.4.0.154.135
4.4.0.154.135
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-4.4.0-154-generic<4.4.0-154.181~14.04.1
4.4.0-154.181~14.04.1
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-lowlatency-lts-xenial<4.4.0.154.135
4.4.0.154.135
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-4.4.0-154-powerpc-smp<4.4.0-154.181~14.04.1
4.4.0-154.181~14.04.1
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-4.4.0-154-powerpc-e500mc<4.4.0-154.181~14.04.1
4.4.0-154.181~14.04.1
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-azure<4.15.0.1049.36
4.15.0.1049.36
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-4.4.0-154-lowlatency<4.4.0-154.181~14.04.1
4.4.0-154.181~14.04.1
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-aws<4.4.0.1048.49
4.4.0.1048.49
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-powerpc64-smp-lts-xenial<4.4.0.154.135
4.4.0.154.135
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-4.4.0-154-powerpc64-emb<4.4.0-154.181~14.04.1
4.4.0-154.181~14.04.1
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-powerpc-e500mc-lts-xenial<4.4.0.154.135
4.4.0.154.135
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-virtual-lts-xenial<4.4.0.154.135
4.4.0.154.135
Ubuntu Ubuntu=14.04
All of the following
ubuntu/linux-image-4.15.0-1049-azure<4.15.0-1049.54~14.04.1
4.15.0-1049.54~14.04.1
Ubuntu Ubuntu=14.04

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/linux-image-powerpc-smp-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0.154.135
  2. Upgrade

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

    Fixed in 4.4.0.154.135
  3. Upgrade

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

    Fixed in 4.4.0.154.135
  4. Upgrade

    Upgrade ubuntu/linux-image-4.4.0-154-powerpc64-smp to a version that resolves this vulnerability.

    Fixed in 4.4.0-154.181~14.04.1
  5. Upgrade

    Upgrade ubuntu/linux-image-4.4.0-154-generic-lpae to a version that resolves this vulnerability.

    Fixed in 4.4.0-154.181~14.04.1
  6. Upgrade

    Upgrade ubuntu/linux-image-4.4.0-1048-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1048.52
  7. Upgrade

    Upgrade ubuntu/linux-image-powerpc64-emb-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0.154.135
  8. Upgrade

    Upgrade ubuntu/linux-image-4.4.0-154-generic to a version that resolves this vulnerability.

    Fixed in 4.4.0-154.181~14.04.1
  9. Upgrade

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

    Fixed in 4.4.0.154.135
  10. Upgrade

    Upgrade ubuntu/linux-image-4.4.0-154-powerpc-smp to a version that resolves this vulnerability.

    Fixed in 4.4.0-154.181~14.04.1
  11. Upgrade

    Upgrade ubuntu/linux-image-4.4.0-154-powerpc-e500mc to a version that resolves this vulnerability.

    Fixed in 4.4.0-154.181~14.04.1
  12. Upgrade

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

    Fixed in 4.15.0.1049.36
  13. Upgrade

    Upgrade ubuntu/linux-image-4.4.0-154-lowlatency to a version that resolves this vulnerability.

    Fixed in 4.4.0-154.181~14.04.1
  14. Upgrade

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

    Fixed in 4.4.0.1048.49
  15. Upgrade

    Upgrade ubuntu/linux-image-powerpc64-smp-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0.154.135
  16. Upgrade

    Upgrade ubuntu/linux-image-4.4.0-154-powerpc64-emb to a version that resolves this vulnerability.

    Fixed in 4.4.0-154.181~14.04.1
  17. Upgrade

    Upgrade ubuntu/linux-image-powerpc-e500mc-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0.154.135
  18. Upgrade

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

    Fixed in 4.4.0.154.135
  19. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-1049-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1049.54~14.04.1
  20. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch USN-4017-2
  21. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch USN-4041-1
  22. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch USN-4041-2

Event History

Jun 29, 2019
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 vulnerability ID for this update?

The vulnerability ID for this update is CVE-2019-11479.

2

What is the impact of CVE-2019-11479?

CVE-2019-11479 can lead to denial of service (DoS) attacks by consuming excessive resources on a target system.

3

How can I fix the CVE-2019-11479 vulnerability?

To fix the CVE-2019-11479 vulnerability, you should update the Linux kernel to version 4.4.0.154.135 or later.

4

Where can I find more information about CVE-2019-11479?

More information about CVE-2019-11479 can be found on the Ubuntu Security Notices website.

5

What is the link to the Ubuntu Security Notice for this update?

The Ubuntu Security Notice for this update can be found at: [Link to USN-4041-2]

Company

Resources

Contact

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