=========================================================================Ubuntu Security Notice USN-4017-1
June 17, 2019

linux, linux-aws, linux-aws-hwe, linux-azure, linux-gcp, linux-hwe,
linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon
vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.04
- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

The system could be made to crash if it received specially crafted
network traffic.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon processors- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-oem: Linux kernel for OEM processors- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems

Details:

Jonathan Looney discovered that the TCP retransmission queue implementation
in the Linux kernel could be fragmented when handling certain TCP Selective
Acknowledgment (SACK) sequences. A remote attacker could use this to cause
a denial of service. (CVE-2019-11478)

Jonathan Looney discovered that an integer overflow existed in the Linux
kernel when handling TCP Selective Acknowledgments (SACKs). A remote
attacker could use this to cause a denial of service (system crash).
(CVE-2019-11477)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 19.04:
  linux-image-5.0.0-1008-aws      5.0.0-1008.8
  linux-image-5.0.0-1008-gcp      5.0.0-1008.8
  linux-image-5.0.0-1008-kvm      5.0.0-1008.8
  linux-image-5.0.0-1010-raspi2   5.0.0-1010.10
  linux-image-5.0.0-1014-snapdragon  5.0.0-1014.14
  linux-image-5.0.0-17-generic    5.0.0-17.18
  linux-image-5.0.0-17-generic-lpae  5.0.0-17.18
  linux-image-5.0.0-17-lowlatency  5.0.0-17.18
  linux-image-aws                 5.0.0.1008.8
  linux-image-gcp                 5.0.0.1008.8
  linux-image-generic             5.0.0.17.18
  linux-image-generic-lpae        5.0.0.17.18
  linux-image-gke                 5.0.0.1008.8
  linux-image-kvm                 5.0.0.1008.8
  linux-image-lowlatency          5.0.0.17.18
  linux-image-raspi2              5.0.0.1010.7
  linux-image-snapdragon          5.0.0.1014.7
  linux-image-virtual             5.0.0.17.18

Ubuntu 18.10:
  linux-image-4.18.0-1013-gcp     4.18.0-1013.14
  linux-image-4.18.0-1014-kvm     4.18.0-1014.14
  linux-image-4.18.0-1016-raspi2  4.18.0-1016.18
  linux-image-4.18.0-1018-aws     4.18.0-1018.20
  linux-image-4.18.0-1020-azure   4.18.0-1020.20
  linux-image-4.18.0-22-generic   4.18.0-22.23
  linux-image-4.18.0-22-generic-lpae  4.18.0-22.23
  linux-image-4.18.0-22-lowlatency  4.18.0-22.23
  linux-image-4.18.0-22-snapdragon  4.18.0-22.23
  linux-image-aws                 4.18.0.1018.18
  linux-image-azure               4.18.0.1020.21
  linux-image-gcp                 4.18.0.1013.13
  linux-image-generic             4.18.0.22.23
  linux-image-generic-lpae        4.18.0.22.23
  linux-image-gke                 4.18.0.1013.13
  linux-image-kvm                 4.18.0.1014.14
  linux-image-lowlatency          4.18.0.22.23
  linux-image-raspi2              4.18.0.1016.13
  linux-image-snapdragon          4.18.0.22.23
  linux-image-virtual             4.18.0.22.23

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1015-oracle  4.15.0-1015.17
  linux-image-4.15.0-1034-gcp     4.15.0-1034.36
  linux-image-4.15.0-1036-kvm     4.15.0-1036.36
  linux-image-4.15.0-1038-raspi2  4.15.0-1038.40
  linux-image-4.15.0-1041-aws     4.15.0-1041.43
  linux-image-4.15.0-1043-oem     4.15.0-1043.48
  linux-image-4.15.0-1055-snapdragon  4.15.0-1055.59
  linux-image-4.15.0-52-generic   4.15.0-52.56
  linux-image-4.15.0-52-generic-lpae  4.15.0-52.56
  linux-image-4.15.0-52-lowlatency  4.15.0-52.56
  linux-image-4.18.0-1020-azure   4.18.0-1020.20~18.04.1
  linux-image-4.18.0-22-generic   4.18.0-22.23~18.04.1
  linux-image-4.18.0-22-generic-lpae  4.18.0-22.23~18.04.1
  linux-image-4.18.0-22-lowlatency  4.18.0-22.23~18.04.1
  linux-image-4.18.0-22-snapdragon  4.18.0-22.23~18.04.1
  linux-image-aws                 4.15.0.1041.40
  linux-image-azure               4.18.0.1020.19
  linux-image-gcp                 4.15.0.1034.36
  linux-image-generic             4.15.0.52.54
  linux-image-generic-hwe-18.04   4.18.0.22.72
  linux-image-generic-lpae        4.15.0.52.54
  linux-image-generic-lpae-hwe-18.04  4.18.0.22.72
  linux-image-kvm                 4.15.0.1036.36
  linux-image-lowlatency          4.15.0.52.54
  linux-image-lowlatency-hwe-18.04  4.18.0.22.72
  linux-image-oem                 4.15.0.1043.47
  linux-image-oracle              4.15.0.1015.18
  linux-image-raspi2              4.15.0.1038.36
  linux-image-snapdragon          4.15.0.1055.58
  linux-image-snapdragon-hwe-18.04  4.18.0.22.72
  linux-image-virtual             4.15.0.52.54
  linux-image-virtual-hwe-18.04   4.18.0.22.72

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1015-oracle  4.15.0-1015.17~16.04.1
  linux-image-4.15.0-1034-gcp     4.15.0-1034.36~16.04.1
  linux-image-4.15.0-1041-aws     4.15.0-1041.43~16.04.1
  linux-image-4.15.0-1047-azure   4.15.0-1047.51
  linux-image-4.15.0-52-generic   4.15.0-52.56~16.04.1
  linux-image-4.15.0-52-generic-lpae  4.15.0-52.56~16.04.1
  linux-image-4.15.0-52-lowlatency  4.15.0-52.56~16.04.1
  linux-image-4.4.0-1048-kvm      4.4.0-1048.55
  linux-image-4.4.0-1085-aws      4.4.0-1085.96
  linux-image-4.4.0-1111-raspi2   4.4.0-1111.120
  linux-image-4.4.0-1115-snapdragon  4.4.0-1115.121
  linux-image-4.4.0-151-generic   4.4.0-151.178
  linux-image-4.4.0-151-generic-lpae  4.4.0-151.178
  linux-image-4.4.0-151-lowlatency  4.4.0-151.178
  linux-image-4.4.0-151-powerpc-e500mc  4.4.0-151.178
  linux-image-4.4.0-151-powerpc-smp  4.4.0-151.178
  linux-image-4.4.0-151-powerpc64-emb  4.4.0-151.178
  linux-image-4.4.0-151-powerpc64-smp  4.4.0-151.178
  linux-image-aws                 4.4.0.1085.88
  linux-image-aws-hwe             4.15.0.1041.41
  linux-image-azure               4.15.0.1047.51
  linux-image-gcp                 4.15.0.1034.48
  linux-image-generic             4.4.0.151.159
  linux-image-generic-hwe-16.04   4.15.0.52.73
  linux-image-generic-lpae        4.4.0.151.159
  linux-image-generic-lpae-hwe-16.04  4.15.0.52.73
  linux-image-gke                 4.15.0.1034.48
  linux-image-kvm                 4.4.0.1048.48
  linux-image-lowlatency          4.4.0.151.159
  linux-image-lowlatency-hwe-16.04  4.15.0.52.73
  linux-image-oem                 4.15.0.52.73
  linux-image-oracle              4.15.0.1015.9
  linux-image-powerpc-e500mc      4.4.0.151.159
  linux-image-powerpc-smp         4.4.0.151.159
  linux-image-powerpc64-emb       4.4.0.151.159
  linux-image-powerpc64-smp       4.4.0.151.159
  linux-image-raspi2              4.4.0.1111.111
  linux-image-snapdragon          4.4.0.1115.107
  linux-image-virtual             4.4.0.151.159
  linux-image-virtual-hwe-16.04   4.15.0.52.73

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
  https://ubuntu.com/security/notices/USN-4017-1
  CVE-2019-11477, CVE-2019-11478,
  https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.0.0-17.18
  https://launchpad.net/ubuntu/+source/linux-aws/5.0.0-1008.8
  https://launchpad.net/ubuntu/+source/linux-gcp/5.0.0-1008.8
  https://launchpad.net/ubuntu/+source/linux-kvm/5.0.0-1008.8
  https://launchpad.net/ubuntu/+source/linux-raspi2/5.0.0-1010.10
  https://launchpad.net/ubuntu/+source/linux-snapdragon/5.0.0-1014.14
  https://launchpad.net/ubuntu/+source/linux/4.18.0-22.23
  https://launchpad.net/ubuntu/+source/linux-aws/4.18.0-1018.20
  https://launchpad.net/ubuntu/+source/linux-azure/4.18.0-1020.20
  https://launchpad.net/ubuntu/+source/linux-gcp/4.18.0-1013.14
  https://launchpad.net/ubuntu/+source/linux-kvm/4.18.0-1014.14
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.18.0-1016.18
  https://launchpad.net/ubuntu/+source/linux/4.15.0-52.56
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1041.43
  https://launchpad.net/ubuntu/+source/linux-azure/4.18.0-1020.20~18.04.1
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1034.36
  https://launchpad.net/ubuntu/+source/linux-hwe/4.18.0-22.23~18.04.1
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1036.36
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1043.48
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1015.17
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1038.40
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1055.59
  https://launchpad.net/ubuntu/+source/linux/4.4.0-151.178
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1085.96
  https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1041.43~16.04.1
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1047.51
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1034.36~16.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-52.56~16.04.1
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1048.55
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1015.17~16.04.1
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1111.120
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1115.121