Ubuntu 16.04 LTS: USN-3485-1 Critical: Kernel Denial of Service

ubuntu

November 21, 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 race condition existed in the ALSA subsystem of

the Linux kernel when creating and deleting a port via ioctl(). A local

attacker could use this to cause a denial of service (system crash) or

possibly execute arbitrary code. (CVE-2017-15265)

Eric Biggers discovered that the key management subsystem in the Linux

kernel did not properly restrict adding a key that already exists but is

uninstantiated. A local attacker could use this to cause a denial of

service (system crash) or possibly execute arbitrary code. (CVE-2017-15299)

It was discovered that a race condition ...

Read the Full Advisory

Topics Covered

security advisory denial of service critical Ubuntu kernel system crash

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-101-generic   4.4.0-101.124
  linux-image-4.4.0-101-generic-lpae  4.4.0-101.124
  linux-image-4.4.0-101-lowlatency  4.4.0-101.124
  linux-image-4.4.0-101-powerpc-e500mc  4.4.0-101.124
  linux-image-4.4.0-101-powerpc-smp  4.4.0-101.124
  linux-image-4.4.0-101-powerpc64-emb  4.4.0-101.124
  linux-image-4.4.0-101-powerpc64-smp  4.4.0-101.124
  linux-image-4.4.0-1010-kvm      4.4.0-1010.15
  linux-image-4.4.0-1034-gke      4.4.0-1034.34
  linux-image-4.4.0-1041-aws      4.4.0-1041.50
  linux-image-4.4.0-1077-raspi2   4.4.0-1077.85
  linux-image-4.4.0-1079-snapdragon  4.4.0-1079.84
  linux-image-aws                 4.4.0.1041.43
  linux-image-generic             4.4.0.101.106
  linux-image-generic-lpae        4.4.0.101.106
  linux-image-gke                 4.4.0.1034.35
  linux-image-kvm                 4.4.0.1010.10
  linux-image-lowlatency          4.4.0.101.106
  linux-image-powerpc-e500mc      4.4.0.101.106
  linux-image-powerpc-smp         4.4.0.101.106
  linux-image-powerpc64-emb       4.4.0.101.106
  linux-image-powerpc64-smp       4.4.0.101.106
  linux-image-raspi2              4.4.0.1077.77
  linux-image-snapdragon          4.4.0.1079.71

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.