Ubuntu 19.04 USN-4005-1: Critical Kernel Security Flaws

ubuntu

June 4, 2019

Several security issues were fixed in the Linux kernel.

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)

Topics Covered

security advisory denial of service kernel update Ubuntu local attack

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

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.