Ubuntu 16.04 LTS: USN-3420-1 Critical: Kernel Crash Issues

ubuntu

September 18, 2017

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-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

...

Read the Full Advisory

Topics Covered

security advisory denial of service buffer overflow Ubuntu kernel update instructions system crash

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

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.