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Ubuntu 14.04 LTS USN-3168-1 Critical: Kernel Bugs and Threats

ubuntu
Calendar Grey January 11, 2017
Scroller Ubuntu
Critical kernel issues in Ubuntu 14.04 LTS addressed with updates. Follow the instructions for a secure system.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Dmitry Vyukov discovered that the KVM implementation in the Linux kernel

did not properly initialize the Code Segment (CS) in certain error cases. A

local attacker could use this to expose sensitive information (kernel

memory). (CVE-2016-9756)

Andrey Konovalov discovered that signed integer overflows existed in the

setsockopt() system call when handling the SO_SNDBUFFORCE and

SO_RCVBUFFORCE options. A local attacker with the CAP_NET_ADMIN capability

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

corruption). (CVE-2016-9793)

Baozeng Ding discovered a race condition that could lead to a use-after-

free in the Advanced Linux Sound Architecture (ALSA) subsystem of the Linux

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

(system crash). (CVE-2016-9794)

Baozeng Ding discovered a double free in the netlink_dump() function in the

Linux kern...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical software update bug fix kernel ubuntu

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-3.13.0-107-generic  3.13.0-107.154
  linux-image-3.13.0-107-generic-lpae  3.13.0-107.154
  linux-image-3.13.0-107-lowlatency  3.13.0-107.154
  linux-image-3.13.0-107-powerpc-e500  3.13.0-107.154
  linux-image-3.13.0-107-powerpc-e500mc  3.13.0-107.154
  linux-image-3.13.0-107-powerpc-smp  3.13.0-107.154
  linux-image-3.13.0-107-powerpc64-emb  3.13.0-107.154
  linux-image-3.13.0-107-powerpc64-smp  3.13.0-107.154
  linux-image-generic             3.13.0.107.115
  linux-image-generic-lpae        3.13.0.107.115
  linux-image-lowlatency          3.13.0.107.115
  linux-image-powerpc-e500        3.13.0.107.115
  linux-image-powerpc-e500mc      3.13.0.107.115
  linux-image-powerpc-smp         3.13.0.107.115
  linux-image-powerpc64-emb       3.13.0.107.115
  linux-image-powerpc64-smp       3.13.0.107.115

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

CVE-2016-9756, CVE-2016-9793, CVE-2016-9794, CVE-2016-9806

Severity
critical
Lowest
Low
Medium
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Critical

January 11, 2017

Topics%20covered

Topics Covered

security advisory denial of service critical software update bug fix kernel ubuntu

Package Information

https://launchpad.net/ubuntu/+source/linux/3.13.0-107.154

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