Advisory Published

USN-4041-1: Linux kernel update

First published: Sat Jun 29 2019(Updated: )

USN-4017-1 fixed vulnerabilities in the Linux kernel for Ubuntu. Unfortunately, the update introduced a regression that interfered with networking applications that setup very low SO_SNDBUF 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.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-5.0.0-1010-aws<5.0.0-1010.11
5.0.0-1010.11
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-5.0.0-1010-azure<5.0.0-1010.10
5.0.0-1010.10
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-5.0.0-1010-gcp<5.0.0-1010.10
5.0.0-1010.10
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-5.0.0-1010-kvm<5.0.0-1010.11
5.0.0-1010.11
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-5.0.0-1012-raspi2<5.0.0-1012.12
5.0.0-1012.12
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-5.0.0-1016-snapdragon<5.0.0-1016.17
5.0.0-1016.17
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-5.0.0-20-generic<5.0.0-20.21
5.0.0-20.21
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-5.0.0-20-generic-lpae<5.0.0-20.21
5.0.0-20.21
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-5.0.0-20-lowlatency<5.0.0-20.21
5.0.0-20.21
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-aws<5.0.0.1010.10
5.0.0.1010.10
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-azure<5.0.0.1010.9
5.0.0.1010.9
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-gcp<5.0.0.1010.10
5.0.0.1010.10
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-generic<5.0.0.20.21
5.0.0.20.21
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-generic-lpae<5.0.0.20.21
5.0.0.20.21
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-gke<5.0.0.1010.10
5.0.0.1010.10
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-kvm<5.0.0.1010.10
5.0.0.1010.10
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-lowlatency<5.0.0.20.21
5.0.0.20.21
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-raspi2<5.0.0.1012.9
5.0.0.1012.9
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-snapdragon<5.0.0.1016.9
5.0.0.1016.9
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-virtual<5.0.0.20.21
5.0.0.20.21
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-4.18.0-1015-gcp<4.18.0-1015.16
4.18.0-1015.16
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-4.18.0-1016-kvm<4.18.0-1016.17
4.18.0-1016.17
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-4.18.0-1018-raspi2<4.18.0-1018.21
4.18.0-1018.21
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-4.18.0-1020-aws<4.18.0-1020.24
4.18.0-1020.24
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-4.18.0-1023-azure<4.18.0-1023.24
4.18.0-1023.24
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-4.18.0-25-generic<4.18.0-25.26
4.18.0-25.26
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-4.18.0-25-generic-lpae<4.18.0-25.26
4.18.0-25.26
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-4.18.0-25-lowlatency<4.18.0-25.26
4.18.0-25.26
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-4.18.0-25-snapdragon<4.18.0-25.26
4.18.0-25.26
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-aws<4.18.0.1020.20
4.18.0.1020.20
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-azure<4.18.0.1023.25
4.18.0.1023.25
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-gcp<4.18.0.1015.15
4.18.0.1015.15
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-generic<4.18.0.25.26
4.18.0.25.26
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-generic-lpae<4.18.0.25.26
4.18.0.25.26
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-gke<4.18.0.1015.15
4.18.0.1015.15
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-kvm<4.18.0.1016.16
4.18.0.1016.16
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-lowlatency<4.18.0.25.26
4.18.0.25.26
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-powerpc-e500mc<4.18.0.25.26
4.18.0.25.26
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-powerpc-smp<4.18.0.25.26
4.18.0.25.26
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-powerpc64-emb<4.18.0.25.26
4.18.0.25.26
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-powerpc64-smp<4.18.0.25.26
4.18.0.25.26
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-raspi2<4.18.0.1018.15
4.18.0.1018.15
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-snapdragon<4.18.0.25.26
4.18.0.25.26
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-virtual<4.18.0.25.26
4.18.0.25.26
Ubuntu OpenSSH Client=18.10
All of
ubuntu/linux-image-4.15.0-1017-oracle<4.15.0-1017.19
4.15.0-1017.19
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.15.0-1036-gcp<4.15.0-1036.38
4.15.0-1036.38
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.15.0-1036-gke<4.15.0-1036.38
4.15.0-1036.38
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.15.0-1038-kvm<4.15.0-1038.38
4.15.0-1038.38
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.15.0-1040-raspi2<4.15.0-1040.43
4.15.0-1040.43
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.15.0-1043-aws<4.15.0-1043.45
4.15.0-1043.45
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.15.0-1045-oem<4.15.0-1045.50
4.15.0-1045.50
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.15.0-1057-snapdragon<4.15.0-1057.62
4.15.0-1057.62
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.15.0-54-generic<4.15.0-54.58
4.15.0-54.58
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.15.0-54-generic-lpae<4.15.0-54.58
4.15.0-54.58
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.15.0-54-lowlatency<4.15.0-54.58
4.15.0-54.58
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.18.0-1023-azure<4.18.0-1023.24~18.04.1
4.18.0-1023.24~18.04.1
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.18.0-25-generic<4.18.0-25.26~18.04.1
4.18.0-25.26~18.04.1
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.18.0-25-generic-lpae<4.18.0-25.26~18.04.1
4.18.0-25.26~18.04.1
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.18.0-25-lowlatency<4.18.0-25.26~18.04.1
4.18.0-25.26~18.04.1
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.18.0-25-snapdragon<4.18.0-25.26~18.04.1
4.18.0-25.26~18.04.1
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-aws<4.15.0.1043.42
4.15.0.1043.42
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-azure<4.18.0.1023.21
4.18.0.1023.21
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-gcp<4.15.0.1036.38
4.15.0.1036.38
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-generic<4.15.0.54.56
4.15.0.54.56
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-generic-hwe-18.04<4.18.0.25.74
4.18.0.25.74
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-generic-lpae<4.15.0.54.56
4.15.0.54.56
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-generic-lpae-hwe-18.04<4.18.0.25.74
4.18.0.25.74
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-gke<4.15.0.1036.39
4.15.0.1036.39
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-gke-4.15<4.15.0.1036.39
4.15.0.1036.39
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-kvm<4.15.0.1038.38
4.15.0.1038.38
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-lowlatency<4.15.0.54.56
4.15.0.54.56
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-lowlatency-hwe-18.04<4.18.0.25.74
4.18.0.25.74
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-oem<4.15.0.1045.49
4.15.0.1045.49
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-oracle<4.15.0.1017.20
4.15.0.1017.20
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-raspi2<4.15.0.1040.38
4.15.0.1040.38
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-snapdragon<4.15.0.1057.60
4.15.0.1057.60
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-snapdragon-hwe-18.04<4.18.0.25.74
4.18.0.25.74
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-virtual<4.15.0.54.56
4.15.0.54.56
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-virtual-hwe-18.04<4.18.0.25.74
4.18.0.25.74
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.15.0-1017-oracle<4.15.0-1017.19~16.04.2
4.15.0-1017.19~16.04.2
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.15.0-1036-gcp<4.15.0-1036.38~16.04.1
4.15.0-1036.38~16.04.1
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.15.0-1043-aws<4.15.0-1043.45~16.04.1
4.15.0-1043.45~16.04.1
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.15.0-1049-azure<4.15.0-1049.54
4.15.0-1049.54
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.15.0-54-generic<4.15.0-54.58~16.04.1
4.15.0-54.58~16.04.1
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.15.0-54-generic-lpae<4.15.0-54.58~16.04.1
4.15.0-54.58~16.04.1
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.15.0-54-lowlatency<4.15.0-54.58~16.04.1
4.15.0-54.58~16.04.1
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.4.0-1051-kvm<4.4.0-1051.58
4.4.0-1051.58
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.4.0-1087-aws<4.4.0-1087.98
4.4.0-1087.98
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.4.0-1114-raspi2<4.4.0-1114.123
4.4.0-1114.123
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.4.0-1118-snapdragon<4.4.0-1118.124
4.4.0-1118.124
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.4.0-154-generic<4.4.0-154.181
4.4.0-154.181
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.4.0-154-generic-lpae<4.4.0-154.181
4.4.0-154.181
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.4.0-154-lowlatency<4.4.0-154.181
4.4.0-154.181
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.4.0-154-powerpc-e500mc<4.4.0-154.181
4.4.0-154.181
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.4.0-154-powerpc-smp<4.4.0-154.181
4.4.0-154.181
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.4.0-154-powerpc64-emb<4.4.0-154.181
4.4.0-154.181
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.4.0-154-powerpc64-smp<4.4.0-154.181
4.4.0-154.181
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-aws<4.4.0.1087.90
4.4.0.1087.90
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-aws-hwe<4.15.0.1043.43
4.15.0.1043.43
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-azure<4.15.0.1049.52
4.15.0.1049.52
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-gcp<4.15.0.1036.50
4.15.0.1036.50
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-generic<4.4.0.154.162
4.4.0.154.162
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-generic-hwe-16.04<4.15.0.54.75
4.15.0.54.75
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-generic-lpae<4.4.0.154.162
4.4.0.154.162
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-generic-lpae-hwe-16.04<4.15.0.54.75
4.15.0.54.75
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-gke<4.15.0.1036.50
4.15.0.1036.50
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-kvm<4.4.0.1051.51
4.4.0.1051.51
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-lowlatency<4.4.0.154.162
4.4.0.154.162
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-lowlatency-hwe-16.04<4.15.0.54.75
4.15.0.54.75
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-oem<4.15.0.54.75
4.15.0.54.75
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-oracle<4.15.0.1017.11
4.15.0.1017.11
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-powerpc-e500mc<4.4.0.154.162
4.4.0.154.162
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-powerpc-smp<4.4.0.154.162
4.4.0.154.162
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-powerpc64-emb<4.4.0.154.162
4.4.0.154.162
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-powerpc64-smp<4.4.0.154.162
4.4.0.154.162
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-raspi2<4.4.0.1114.114
4.4.0.1114.114
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-snapdragon<4.4.0.1118.110
4.4.0.1118.110
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-virtual<4.4.0.154.162
4.4.0.154.162
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-virtual-hwe-16.04<4.15.0.54.75
4.15.0.54.75
Ubuntu OpenSSH Client=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-4041-1?

    The severity of USN-4041-1 is categorized as medium due to its potential impact on network functionality.

  • How do I fix USN-4041-1?

    To mitigate the issue of USN-4041-1, users should update their systems to the latest kernel version as specified in the advisory.

  • What systems are affected by USN-4041-1?

    USN-4041-1 affects Ubuntu versions 19.04 with specific kernel packages including linux-image-5.0.0-1010-aws and others.

  • What specific vulnerabilities were addressed in USN-4041-1?

    USN-4041-1 addresses a regression caused by the previous update that interfered with networking applications.

  • Is there a workaround for USN-4041-1 until a fix is applied?

    A workaround for USN-4041-1 could involve adjusting the SO_SNDBUF settings in your network applications until the fix is applied.

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