CVE-2016-4998

Name	CVE-2016-4998
Description	The IPT_SO_SET_REPLACE setsockopt implementation in the netfilter subsystem in the Linux kernel before 4.6 allows local users to cause a denial of service (out-of-bounds read) or possibly obtain sensitive information from kernel heap memory by leveraging in-container root access to provide a crafted offset value that leads to crossing a ruleset blob boundary.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
References	DSA-3607-1
NVD severity	medium (attack range: local)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	jessie	3.16.56-1+deb8u1	fixed
	jessie (security)	3.16.68-2	fixed
	stretch	4.9.168-1	fixed
	stretch (security)	4.9.168-1+deb9u3	fixed
	buster, sid	4.19.37-5	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
linux	source	(unstable)	4.6.2-2	medium
linux	source	jessie	3.16.7-ckt25-2+deb8u2	medium	DSA-3607-1

Notes

[wheezy] - linux <no-dsa> (Only exploitable by privileged user; too many changes to backport)
Non-privileged user namespaces disabled by default, only vulnerable with sysctl kernel.unprivileged_userns_clone=1