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Ubuntu 16.04 LTS: USN-3169-4 Critical: Denial of Service Risk

ubuntu
Calendar Grey January 11, 2017
Scroller Ubuntu
Multiple flaws were addressed in Ubuntu's linux-raspberrypi kernel that posed threats to system integrity and safety.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-snapdragon: Linux kernel for Snapdragon Processors

Details:

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)

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)

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu system crash linux-snapdragon

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1044-snapdragon  4.4.0-1044.48
  linux-image-snapdragon          4.4.0.1044.36

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-3169-4

https://ubuntu.com/security/notices/USN-3169-1

CVE-2016-9793, CVE-2016-9794

Severity
critical
Lowest
Low
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Critical

January 11, 2017

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu system crash linux-snapdragon

Package Information

https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1044.48

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