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Ubuntu 14.04 LTS USN-3485-3 Critical: Linux AWS Kernel Denial Of Service

ubuntu
Calendar Grey November 21, 2017
Scroller Ubuntu
A range of security flaws in the Linux kernel impacting Ubuntu AWS instances necessitate prompt action and system upgrades.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

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 existed in the packet fanout

implementation in the Linux kernel. A local attacker could use this to

cause a denial of service (system crash) or possibly execute arbitrary

code. (CVE-2017-15649)

Eric Biggers discovered a race condition in the ke...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical system crash linux-aws

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.4.0-1003-aws      4.4.0-1003.3
  linux-image-aws                 4.4.0.1003.3

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-3485-3

https://ubuntu.com/security/notices/USN-3485-1

CVE-2017-15265, CVE-2017-15299, CVE-2017-15649, CVE-2017-15951,

CVE-2017-16525, CVE-2017-16526, CVE-2017-16527, CVE-2017-16529,

CVE-2017-16530, CVE-2017-16531, CVE-2017-16533, CVE-2017-16534,

CVE-2017-16535

Severity
critical
Lowest
Low
Medium
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Critical

November 21, 2017

Topics%20covered

Topics Covered

security advisory denial of service critical system crash linux-aws

Package Information

https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1003.3

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