USN-3420-1: Linux kernel vulnerabilities

18 September 2017

linux, linux-aws, linux-gke, 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-gke - Linux kernel for Google Container Engine (GKE) 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 buffer overflow existed in the Bluetooth stack of the Linux kernel when handling L2CAP configuration responses. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2017-1000251)

It was discovered that the Flash-Friendly File System (f2fs) implementation in the Linux kernel did not properly validate superblock metadata. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-10663)

It was discovered that a buffer overflow existed in the ioctl handling code in the ISDN subsystem of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-12762)

Pengfei Wang discovered that a race condition existed in the NXP SAA7164 TV Decoder driver for the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-8831)

Update instructions

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

Ubuntu 16.04 LTS
linux-image-4.4.0-1007-kvm - 4.4.0-1007.12
linux-image-4.4.0-1031-gke - 4.4.0-1031.31
linux-image-4.4.0-1035-aws - 4.4.0-1035.44
linux-image-4.4.0-1074-raspi2 - 4.4.0-1074.82
linux-image-4.4.0-1076-snapdragon - 4.4.0-1076.81
linux-image-4.4.0-96-generic - 4.4.0-96.119
linux-image-4.4.0-96-generic-lpae - 4.4.0-96.119
linux-image-4.4.0-96-lowlatency - 4.4.0-96.119
linux-image-4.4.0-96-powerpc-e500mc - 4.4.0-96.119
linux-image-4.4.0-96-powerpc-smp - 4.4.0-96.119
linux-image-4.4.0-96-powerpc64-emb - 4.4.0-96.119
linux-image-4.4.0-96-powerpc64-smp - 4.4.0-96.119
linux-image-aws - 4.4.0.1035.37
linux-image-generic - 4.4.0.96.101
linux-image-generic-lpae - 4.4.0.96.101
linux-image-gke - 4.4.0.1031.32
linux-image-kvm - 4.4.0.1007.7
linux-image-lowlatency - 4.4.0.96.101
linux-image-powerpc-e500mc - 4.4.0.96.101
linux-image-powerpc-smp - 4.4.0.96.101
linux-image-powerpc64-emb - 4.4.0.96.101
linux-image-powerpc64-smp - 4.4.0.96.101
linux-image-raspi2 - 4.4.0.1074.74
linux-image-snapdragon - 4.4.0.1076.68

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