USN-4041-2: Linux kernel (HWE) update

29 June 2019

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

Details

USN-4041-1 provided updates for the Linux kernel in Ubuntu.
This update provides the corresponding updates for the Linux kernel
for Ubuntu 16.04 ESM.

USN-4017-2 fixed vulnerabilities in the Linux kernel. 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.
(CVE-2019-11479)

Update instructions

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

Ubuntu 14.04

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-4041-1: linux-image-4.4.0-154-generic-lpae, linux-snapdragon, linux-image-4.15.0-54-generic-lpae, linux-image-4.15.0-1036-gke, linux-image-5.0.0-1010-kvm, linux-image-raspi2, linux-image-4.18.0-25-lowlatency, linux-image-generic-lpae, linux-image-snapdragon-hwe-18.04, linux-image-4.4.0-154-powerpc-smp, linux-image-5.0.0-20-generic, linux-oracle, linux-oem, linux-image-generic-hwe-18.04, linux-image-gke-4.15, linux-image-4.4.0-1051-kvm, linux-image-aws-hwe, linux-image-virtual, linux-image-4.4.0-154-powerpc64-emb, linux-image-gcp, linux-image-powerpc-e500mc, linux-image-oem, linux-image-lowlatency-hwe-16.04, linux-aws, linux-gcp, linux-hwe, linux-image-powerpc64-emb, linux-image-4.18.0-1015-gcp, linux-image-4.4.0-154-lowlatency, linux-image-snapdragon, linux-image-4.15.0-1017-oracle, linux-image-4.18.0-25-snapdragon, linux-image-5.0.0-20-lowlatency, linux-image-generic-hwe-16.04, linux-image-4.18.0-1020-aws, linux-image-azure, linux-image-generic-lpae-hwe-16.04, linux-aws-hwe, linux-raspi2, linux-image-4.18.0-1018-raspi2, linux-image-4.4.0-1118-snapdragon, linux-image-4.15.0-54-generic, linux-image-5.0.0-1016-snapdragon, linux-image-generic-lpae-hwe-18.04, linux-image-powerpc-smp, linux-image-5.0.0-1010-gcp, linux-image-4.4.0-154-powerpc64-smp, linux-image-4.18.0-1023-azure, linux-image-4.18.0-25-generic, linux-image-lowlatency-hwe-18.04, linux-image-4.15.0-1040-raspi2, linux-gke-4.15, linux-image-generic, linux-image-4.15.0-1043-aws, linux-kvm, linux-image-virtual-hwe-16.04, linux-image-4.15.0-1045-oem, linux-image-4.4.0-1087-aws, linux-image-4.15.0-54-lowlatency, linux-image-kvm, linux-image-5.0.0-20-generic-lpae, linux-image-powerpc64-smp, linux-image-4.4.0-154-generic, linux-image-4.4.0-1114-raspi2, linux, linux-image-4.4.0-154-powerpc-e500mc, linux-image-4.15.0-1038-kvm, linux-image-4.18.0-25-generic-lpae, linux-image-5.0.0-1010-aws, linux-image-4.15.0-1049-azure, linux-image-4.15.0-1057-snapdragon, linux-image-5.0.0-1010-azure, linux-image-oracle, linux-image-gke, linux-image-virtual-hwe-18.04, linux-image-4.15.0-1036-gcp, linux-azure, linux-image-4.18.0-1016-kvm, linux-image-aws, linux-image-lowlatency, linux-image-5.0.0-1012-raspi2