USN-3820-1: Linux kernel vulnerabilities

14 November 2018

linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities

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

  • Ubuntu 18.04 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-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-oem - Linux kernel for OEM processors
  • linux-raspi2 - Linux kernel for Raspberry Pi 2

Details

Felix Wilhelm discovered that the Xen netback driver in the Linux kernel did not properly perform input validation in some situations. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-15471)

It was discovered that the generic SCSI driver in the Linux kernel did not properly enforce permissions on kernel memory access. A local attacker could use this to expose sensitive information or possibly elevate privileges. (CVE-2017-13168)

It was discovered that an integer overflow existed in the CD-ROM driver of the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-16658)

It was discovered that an integer overflow existed in the HID Bluetooth implementation in the Linux kernel that could lead to a buffer overwrite. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-9363)

Update instructions

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

Ubuntu 18.04 LTS
linux-image-4.15.0-1024-gcp - 4.15.0-1024.25
linux-image-4.15.0-1026-kvm - 4.15.0-1026.26
linux-image-4.15.0-1026-oem - 4.15.0-1026.31
linux-image-4.15.0-1027-aws - 4.15.0-1027.27
linux-image-4.15.0-1028-raspi2 - 4.15.0-1028.30
linux-image-4.15.0-1031-azure - 4.15.0-1031.32
linux-image-4.15.0-39-generic - 4.15.0-39.42
linux-image-4.15.0-39-generic-lpae - 4.15.0-39.42
linux-image-4.15.0-39-lowlatency - 4.15.0-39.42
linux-image-4.15.0-39-snapdragon - 4.15.0-39.42
linux-image-aws - 4.15.0.1027.27
linux-image-azure - 4.15.0.1031.31
linux-image-gcp - 4.15.0.1024.26
linux-image-generic - 4.15.0.39.41
linux-image-generic-lpae - 4.15.0.39.41
linux-image-gke - 4.15.0.1024.26
linux-image-kvm - 4.15.0.1026.26
linux-image-lowlatency - 4.15.0.39.41
linux-image-oem - 4.15.0.1026.31
linux-image-raspi2 - 4.15.0.1028.26
linux-image-snapdragon - 4.15.0.39.41

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