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CVE-2016-3156

Public on 2016-04-27
Modified on 2017-01-19
Description

A security flaw was found in the Linux kernel's networking subsystem that destroying the network interface with huge number of ipv4 addresses assigned keeps "rtnl_lock" spinlock for a very long time (up to hour). This blocks many network-related operations, including creation of new incoming ssh connections.

The problem is especially important for containers, as the container owner has enough permissions to trigger this and block a network access on a whole host, outside the container.

Severity
Medium
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CVSS v3 Base Score
1.7
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 kernel 2016-04-27 16:15 ALAS-2016-694

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv2 1.7 AV:L/AC:L/Au:S/C:N/I:N/A:P
NVD CVSSv2 2.1 AV:L/AC:L/Au:N/C:N/I:N/A:P
NVD CVSSv3 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H