USN-4008-1: Linux kernel vulnerabilities

4 June 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

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 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)

Federico Manuel Bento discovered that the Linux kernel did not properly apply Address Space Layout Randomization (ASLR) in some situations for setuid a.out binaries. A local attacker could use this to improve the chances of exploiting an existing vulnerability in a setuid a.out binary. (CVE-2019-11191)

As a hardening measure, this update disables a.out support.

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

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