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Ubuntu 16.04 LTS USN-3146-1: Critical Kernel Update and DoS Threats

ubuntu
Calendar Grey November 30, 2016
Scroller Ubuntu
Essential patches address kernel vulnerabilities in Ubuntu 16.04 LTS. Safeguard your PC against possible risks today!
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

It was discovered that the __get_user_asm_ex implementation in the Linux

kernel for x86/x86_64 contained extended asm statements that were

incompatible with the exception table. A local attacker could use this to

gain administrative privileges. (CVE-2016-9644)

Andreas Gruenbacher and Jan Kara discovered that the filesystem

implementation in the Linux kernel did not clear the setgid bit during a

setxattr call. A local attacker could use this to possibly elevate group

privileges. (CVE-2016-7097)

Marco Grassi discovered that the driver for Areca RAID Controllers in the

Linux kernel did not properly validate control messages. A local attacker

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

privileges. (CVE-2016-7425)

Daxing Guo discovered a stack-based buffer overflow in the Broadcom

IEEE802.11n FullMAC driver in the Linux kernel. A local attacker cou...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update ubuntu system crash administrative privileges

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-51-generic    4.4.0-51.72
  linux-image-4.4.0-51-generic-lpae  4.4.0-51.72
  linux-image-4.4.0-51-lowlatency  4.4.0-51.72
  linux-image-4.4.0-51-powerpc-e500mc  4.4.0-51.72
  linux-image-4.4.0-51-powerpc-smp  4.4.0-51.72
  linux-image-4.4.0-51-powerpc64-emb  4.4.0-51.72
  linux-image-4.4.0-51-powerpc64-smp  4.4.0-51.72
  linux-image-generic             4.4.0.51.54
  linux-image-generic-lpae        4.4.0.51.54
  linux-image-lowlatency          4.4.0.51.54
  linux-image-powerpc-e500mc      4.4.0.51.54
  linux-image-powerpc-smp         4.4.0.51.54
  linux-image-powerpc64-emb       4.4.0.51.54
  linux-image-powerpc64-smp       4.4.0.51.54

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-3146-1

CVE-2016-7097, CVE-2016-7425, CVE-2016-8658, CVE-2016-9644

Severity
critical
Lowest
Low
Medium
High
Critical

November 30, 2016

Topics%20covered

Topics Covered

security advisory denial of service kernel update ubuntu system crash administrative privileges

Package Information

https://launchpad.net/ubuntu/+source/linux/4.4.0-51.72

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