Ubuntu 16.04 LTS: USN-4008-1 Critical: Linux Kernel Denial Of Service

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-kvm: Linux kernel for cloud environments

- linux-raspi2: Linux kernel for Raspberry Pi 2

- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

Robert Święcki discovered that the Linux kernel did not properly apply

Address Space Layout Randomization (ASLR) in some situations for setuid elf

binaries. A local attacker could use this to improve the chances of

exploiting an existing vulnerability in a setuid elf binary.

(CVE-2019-11190)

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 ...

Read the Full Advisory

Topics Covered

security advisory DoS Ubuntu kernel local attack setuid ASLR

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1047-kvm      4.4.0-1047.53
  linux-image-4.4.0-1084-aws      4.4.0-1084.94
  linux-image-4.4.0-1110-raspi2   4.4.0-1110.118
  linux-image-4.4.0-1114-snapdragon  4.4.0-1114.119
  linux-image-4.4.0-150-generic   4.4.0-150.176
  linux-image-4.4.0-150-generic-lpae  4.4.0-150.176
  linux-image-4.4.0-150-lowlatency  4.4.0-150.176
  linux-image-4.4.0-150-powerpc-e500mc  4.4.0-150.176
  linux-image-4.4.0-150-powerpc-smp  4.4.0-150.176
  linux-image-4.4.0-150-powerpc64-emb  4.4.0-150.176
  linux-image-4.4.0-150-powerpc64-smp  4.4.0-150.176
  linux-image-aws                 4.4.0.1084.87
  linux-image-generic             4.4.0.150.158
  linux-image-generic-lpae        4.4.0.150.158
  linux-image-kvm                 4.4.0.1047.47
  linux-image-lowlatency          4.4.0.150.158
  linux-image-powerpc-e500mc      4.4.0.150.158
  linux-image-powerpc-smp         4.4.0.150.158
  linux-image-powerpc64-emb       4.4.0.150.158
  linux-image-powerpc64-smp       4.4.0.150.158
  linux-image-raspi2              4.4.0.1110.110
  linux-image-snapdragon          4.4.0.1114.106
  linux-image-virtual             4.4.0.150.158

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.