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Ubuntu 16.04 LTS USN-3208-1 Critical: Kernel Denial Of Service Issues

ubuntu
Calendar Grey February 22, 2017
Dist Ubuntu Esm H88
Important patches released for addressing multiple kernel vulnerabilities in Ubuntu, targeting denial of service issues, unauthorized administrative privileges, and additional security risks.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

- linux-snapdragon: Linux kernel for Snapdragon Processors

Details:

It was discovered that the generic SCSI block layer in the Linux kernel did

not properly restrict write operations in certain situations. A local

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

possibly gain administrative privileges. (CVE-2016-10088)

CAI Qian discovered that the sysctl implementation in the Linux kernel did

not properly perform reference counting in some situations. An unprivileged

attacker could use this to cause a denial of service (system hang).

(CVE-2016-9191)

Jim Mattson discovered that the KVM implementation in the Linux kernel

mismanages the #BP and #OF exceptions. A local attacker in a guest virtual

machine could use this to cause a denial of service (guest OS crash).

(CVE-2016-9588)

Andy Lutomirski and Willy Tarreau discovered that the KVM implementation in

the Linux k...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu critical fix kernel system update administrative access

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1048-snapdragon  4.4.0-1048.52
  linux-image-4.4.0-64-generic    4.4.0-64.85
  linux-image-4.4.0-64-generic-lpae  4.4.0-64.85
  linux-image-4.4.0-64-lowlatency  4.4.0-64.85
  linux-image-4.4.0-64-powerpc-e500mc  4.4.0-64.85
  linux-image-4.4.0-64-powerpc-smp  4.4.0-64.85
  linux-image-4.4.0-64-powerpc64-emb  4.4.0-64.85
  linux-image-4.4.0-64-powerpc64-smp  4.4.0-64.85
  linux-image-generic             4.4.0.64.68
  linux-image-generic-lpae        4.4.0.64.68
  linux-image-lowlatency          4.4.0.64.68
  linux-image-powerpc-e500mc      4.4.0.64.68
  linux-image-powerpc-smp         4.4.0.64.68
  linux-image-powerpc64-emb       4.4.0.64.68
  linux-image-powerpc64-smp       4.4.0.64.68
  linux-image-snapdragon          4.4.0.1048.40

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

https://ubuntu.com/security/notices/USN-3208-1

CVE-2016-10088, CVE-2016-9191, CVE-2016-9588, CVE-2017-2583,

CVE-2017-2584, CVE-2017-5549, CVE-2017-6074

Severity
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February 22, 2017

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu critical fix kernel system update administrative access

Package Information

https://launchpad.net/ubuntu/+source/linux/4.4.0-64.85
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1048.52

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