USN-4005-1: Linux kernel vulnerabilities

4 June 2019

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

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

  • Ubuntu 19.04

Summary

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-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

Details

It was discovered that a null pointer dereference vulnerability existed in the LSI Logic MegaRAID driver in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-11810)

It was discovered that a race condition leading to a use-after-free existed in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux kernel. The RDS protocol is blacklisted by default in Ubuntu. If enabled, a local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-11815)

Update instructions

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

Ubuntu 19.04
linux-image-5.0.0-1007-aws - 5.0.0-1007.7
linux-image-5.0.0-1007-gcp - 5.0.0-1007.7
linux-image-5.0.0-1007-kvm - 5.0.0-1007.7
linux-image-5.0.0-1009-raspi2 - 5.0.0-1009.9
linux-image-5.0.0-1013-snapdragon - 5.0.0-1013.13
linux-image-5.0.0-16-generic - 5.0.0-16.17
linux-image-5.0.0-16-generic-lpae - 5.0.0-16.17
linux-image-5.0.0-16-lowlatency - 5.0.0-16.17
linux-image-aws - 5.0.0.1007.7
linux-image-gcp - 5.0.0.1007.7
linux-image-generic - 5.0.0.16.17
linux-image-generic-lpae - 5.0.0.16.17
linux-image-gke - 5.0.0.1007.7
linux-image-kvm - 5.0.0.1007.7
linux-image-lowlatency - 5.0.0.16.17
linux-image-raspi2 - 5.0.0.1009.6
linux-image-snapdragon - 5.0.0.1013.6

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