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Ubuntu 16.04 LTS USN-3632-1 Critical Azure Kernel Threats

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Calendar Grey April 24, 2018
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Numerous weaknesses in the linux-azure kernel pose significant security threats. Upgrade immediately to safeguard your system.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

Details:

It was discovered that a race condition leading to a use-after-free

vulnerability existed in the ALSA PCM subsystem of the Linux kernel. A

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

or possibly execute arbitrary code. (CVE-2017-0861)

It was discovered that the KVM implementation in the Linux kernel allowed

passthrough of the diagnostic I/O port 0x80. An attacker in a guest VM

could use this to cause a denial of service (system crash) in the host OS.

(CVE-2017-1000407)

It was discovered that a use-after-free vulnerability existed in the

network namespaces 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-2017-15129)

It was discovered that the HugeTLB component of the Linux ker...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu kernel threats linux-azure

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.13.0-1014-azure   4.13.0-1014.17
  linux-image-azure               4.13.0.1014.16

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-3632-1

CVE-2017-0861, CVE-2017-1000407, CVE-2017-15129, CVE-2017-16994,

CVE-2017-17448, CVE-2017-17450, CVE-2017-17741, CVE-2017-17805,

CVE-2017-17806, CVE-2017-17807, CVE-2018-1000026, CVE-2018-5332,

CVE-2018-5333, CVE-2018-5344, CVE-2018-8043

Severity
critical
Lowest
Low
Medium
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Critical

April 24, 2018

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu kernel threats linux-azure

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/4.13.0-1014.17

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