USN-4114-1: Linux kernel vulnerabilities

2 September 2019

linux, linux-azure, linux-gcp, linux-gke-5.0, linux-hwe, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities

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

  • Ubuntu 19.04
  • Ubuntu 18.04 LTS

Summary

Several security issues were fixed in the Linux kernel.

Software Description

  • linux - Linux kernel
  • linux-azure - Linux kernel for Microsoft Azure Cloud 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-gke-5.0 - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel

Details

Amit Klein and Benny Pinkas discovered that the Linux kernel did not sufficiently randomize IP ID values generated for connectionless networking protocols. A remote attacker could use this to track particular Linux devices. (CVE-2019-10638)

Praveen Pandey discovered that the Linux kernel did not properly validate sent signals in some situations on PowerPC systems with transactional memory disabled. A local attacker could use this to cause a denial of service. (CVE-2019-13648)

It was discovered that the floppy driver in the Linux kernel did not properly validate meta data, leading to a buffer overread. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-14283)

It was discovered that the floppy driver in the Linux kernel did not properly validate ioctl() calls, leading to a division-by-zero. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-14284)

Jason Wang discovered that an infinite loop vulnerability existed in the virtio net driver in the Linux kernel. A local attacker in a guest VM could possibly use this to cause a denial of service in the host system. (CVE-2019-3900)

Update instructions

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

Ubuntu 19.04
linux-image-5.0.0-1015-gcp - 5.0.0-1015.15
linux-image-5.0.0-1015-kvm - 5.0.0-1015.16
linux-image-5.0.0-1015-raspi2 - 5.0.0-1015.15
linux-image-5.0.0-1018-azure - 5.0.0-1018.19
linux-image-5.0.0-1019-snapdragon - 5.0.0-1019.20
linux-image-5.0.0-27-generic - 5.0.0-27.28
linux-image-5.0.0-27-generic-lpae - 5.0.0-27.28
linux-image-5.0.0-27-lowlatency - 5.0.0-27.28
linux-image-azure - 5.0.0.1018.17
linux-image-gcp - 5.0.0.1015.41
linux-image-generic - 5.0.0.27.28
linux-image-generic-lpae - 5.0.0.27.28
linux-image-gke - 5.0.0.1015.41
linux-image-kvm - 5.0.0.1015.15
linux-image-lowlatency - 5.0.0.27.28
linux-image-raspi2 - 5.0.0.1015.12
linux-image-snapdragon - 5.0.0.1019.12
linux-image-virtual - 5.0.0.27.28
Ubuntu 18.04 LTS
linux-image-5.0.0-1015-gke - 5.0.0-1015.15~18.04.1
linux-image-5.0.0-1018-azure - 5.0.0-1018.19~18.04.1
linux-image-5.0.0-27-generic - 5.0.0-27.28~18.04.1
linux-image-5.0.0-27-generic-lpae - 5.0.0-27.28~18.04.1
linux-image-5.0.0-27-lowlatency - 5.0.0-27.28~18.04.1
linux-image-azure - 5.0.0.1018.28
linux-image-generic-hwe-18.04 - 5.0.0.27.84
linux-image-generic-lpae-hwe-18.04 - 5.0.0.27.84
linux-image-gke-5.0 - 5.0.0.1015.5
linux-image-lowlatency-hwe-18.04 - 5.0.0.27.84
linux-image-snapdragon-hwe-18.04 - 5.0.0.27.84
linux-image-virtual-hwe-18.04 - 5.0.0.27.84

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