USN-3910-1: Linux kernel vulnerabilities

15 March 2019

linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 16.04 LTS


Several security issues were fixed in the Linux kernel.

Software Description

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon processors


It was discovered that the f2fs filesystem implementation in the Linux kernel did not handle the noflush_merge mount option correctly. An attacker could use this to cause a denial of service (system crash). (CVE-2017-18241)

It was discovered that the procfs filesystem did not properly handle processes mapping some memory elements onto files. A local attacker could use this to block utilities that examine the procfs filesystem to report operating system state, such as ps(1). (CVE-2018-1120)

Hui Peng and Mathias Payer discovered that the Option USB High Speed driver in the Linux kernel did not properly validate metadata received from the device. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2018-19985)

It was discovered that multiple integer overflows existed in the hugetlbfs implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-7740)

Jann Horn discovered a race condition in the fork() system call in the Linux kernel. A local attacker could use this to gain access to services that cache authorizations. (CVE-2019-6133)

Update instructions

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

Ubuntu 16.04 LTS
linux-image-4.4.0-1041-kvm - 4.4.0-1041.47
linux-image-4.4.0-1077-aws - 4.4.0-1077.87
linux-image-4.4.0-1104-raspi2 - 4.4.0-1104.112
linux-image-4.4.0-1108-snapdragon - 4.4.0-1108.113
linux-image-4.4.0-143-generic - 4.4.0-143.169
linux-image-4.4.0-143-generic-lpae - 4.4.0-143.169
linux-image-4.4.0-143-lowlatency - 4.4.0-143.169
linux-image-4.4.0-143-powerpc-e500mc - 4.4.0-143.169
linux-image-4.4.0-143-powerpc-smp - 4.4.0-143.169
linux-image-4.4.0-143-powerpc64-emb - 4.4.0-143.169
linux-image-4.4.0-143-powerpc64-smp - 4.4.0-143.169
linux-image-aws -
linux-image-generic -
linux-image-generic-lpae -
linux-image-kvm -
linux-image-lowlatency -
linux-image-powerpc-e500mc -
linux-image-powerpc-smp -
linux-image-powerpc64-emb -
linux-image-powerpc64-smp -
linux-image-raspi2 -
linux-image-snapdragon -
linux-image-virtual -

To update your system, please follow these instructions:

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.