USN-4017-1: Linux kernel vulnerabilities

17 June 2019

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

Releases

Packages

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

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
Ubuntu 18.10
Ubuntu 18.04
Ubuntu 16.04

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.

Related notices

  • USN-4017-2: linux-image-azure, linux-image-3.2.0-141-powerpc-smp, linux-image-generic-lpae, linux-image-powerpc-e500, linux-image-powerpc64-smp, linux-image-4.15.0-1047-azure, linux-image-3.13.0-171-generic, linux-image-4.4.0-151-generic-lpae, linux-image-generic-lts-raring, linux-image-generic-lpae-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc64-emb, linux-image-3.2.0-141-generic-pae, linux-image-powerpc-smp-lts-xenial, linux-image-3.13.0-171-powerpc-e500, linux-image-aws, linux-image-powerpc-e500mc-lts-xenial, linux-lts-xenial, linux-image-generic-lts-xenial, linux-image-virtual, linux-image-generic-lts-quantal, linux-image-generic-pae, linux-image-generic, linux-image-highbank, linux-image-4.4.0-1046-aws, linux-aws, linux-image-lowlatency, linux-image-lowlatency-pae, linux-lts-trusty, linux-image-3.2.0-141-generic, linux-image-3.2.0-141-virtual, linux-image-lowlatency-lts-xenial, linux, linux-image-4.4.0-151-powerpc64-emb, linux-image-powerpc-smp, linux-image-4.4.0-151-powerpc64-smp, linux-image-3.13.0-171-lowlatency, linux-image-4.4.0-151-powerpc-e500mc, linux-image-3.13.0-171-powerpc-smp, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc-e500mc, linux-image-omap, linux-image-virtual-lts-xenial, linux-image-3.2.0-141-powerpc64-smp, linux-image-3.13.0-171-powerpc64-smp, linux-image-3.2.0-141-highbank, linux-image-4.4.0-151-generic, linux-image-4.4.0-151-powerpc-smp, linux-image-generic-lpae-lts-saucy, linux-image-generic-lts-saucy, linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty, linux-image-3.13.0-171-generic-lpae, linux-image-3.2.0-141-omap, linux-image-powerpc, linux-image-3.13.0-171-powerpc-e500mc, linux-image-3.13.0-171-powerpc64-emb, linux-image-4.4.0-151-lowlatency, linux-azure