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USN-4017-1: Linux kernel vulnerabilities


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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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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://usn.ubuntu.com/4017-1/

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