USN-3797-1: Linux kernel vulnerabilities

23 October 2018

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

Noam Rathaus discovered that a use-after-free vulnerability existed in the Infiniband implementation in the Linux kernel. An attacker could use this to cause a denial of service (system crash). (CVE-2018-14734)

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)

Yves Younan discovered that the CIPSO labeling implementation in the Linux kernel did not properly handle IP header options in some situations. A remote attacker could use this to specially craft network traffic that could cause a denial of service (infinite loop). (CVE-2018-10938)

Update instructions

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

Ubuntu 16.04 LTS
linux-image-4.4.0-1036-kvm - 4.4.0-1036.42
linux-image-4.4.0-1070-aws - 4.4.0-1070.80
linux-image-4.4.0-1099-raspi2 - 4.4.0-1099.107
linux-image-4.4.0-1103-snapdragon - 4.4.0-1103.108
linux-image-4.4.0-138-generic - 4.4.0-138.164
linux-image-4.4.0-138-generic-lpae - 4.4.0-138.164
linux-image-4.4.0-138-lowlatency - 4.4.0-138.164
linux-image-4.4.0-138-powerpc-e500mc - 4.4.0-138.164
linux-image-4.4.0-138-powerpc-smp - 4.4.0-138.164
linux-image-4.4.0-138-powerpc64-emb - 4.4.0-138.164
linux-image-4.4.0-138-powerpc64-smp - 4.4.0-138.164
linux-image-aws - 4.4.0.1070.72
linux-image-generic - 4.4.0.138.144
linux-image-generic-lpae - 4.4.0.138.144
linux-image-kvm - 4.4.0.1036.35
linux-image-lowlatency - 4.4.0.138.144
linux-image-powerpc-e500mc - 4.4.0.138.144
linux-image-powerpc-smp - 4.4.0.138.144
linux-image-powerpc64-emb - 4.4.0.138.144
linux-image-powerpc64-smp - 4.4.0.138.144
linux-image-raspi2 - 4.4.0.1099.99
linux-image-snapdragon - 4.4.0.1103.95

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