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USN-4041-1: Linux kernel update

29 June 2019

Several security issues were fixed in the Linux kernel.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

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-gke-4.15 - Linux kernel for Google Container Engine (GKE) 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

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.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

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-4041-2: linux-image-aws, linux-image-4.4.0-1048-aws, linux-image-virtual-lts-xenial, linux-image-4.4.0-154-lowlatency, linux-image-4.15.0-1049-azure, linux-image-4.4.0-154-powerpc64-emb, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-154-powerpc-smp, linux-image-powerpc64-emb-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-azure, linux-image-4.4.0-154-generic-lpae, linux-image-generic-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-azure, linux-image-4.4.0-154-powerpc-e500mc, linux-aws, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-154-powerpc64-smp, linux-lts-xenial, linux-image-4.4.0-154-generic