The (1) pptp_bind and (2) pptp_connect functions in drivers/net/ppp/pptp.c in the Linux kernel through 4.3.3 do not verify an address length, which allows local users to obtain sensitive information from kernel memory and bypass the KASLR protection mechanism via a crafted application.
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176484.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html
http://twitter.com/grsecurity/statuses/676744240802750464
http://www.debian.org/security/2016/dsa-3434
http://www.openwall.com/lists/oss-security/2015/12/15/11
http://www.securityfocus.com/bid/79428
http://www.securitytracker.com/id/1034549
http://www.ubuntu.com/usn/USN-2886-1
http://www.ubuntu.com/usn/USN-2888-1
http://www.ubuntu.com/usn/USN-2890-1
http://www.ubuntu.com/usn/USN-2890-2
http://www.ubuntu.com/usn/USN-2890-3
https://bugzilla.redhat.com/show_bug.cgi?id=1292045
https://github.com/torvalds/linux/commit/09ccfd238e5a0e670d8178cf50180ea81ae09ae1
Source: MITRE
Published: 2015-12-28
Updated: 2017-11-04
Type: CWE-200
Base Score: 1.9
Vector: AV:L/AC:M/Au:N/C:P/I:N/A:N
Impact Score: 2.9
Exploitability Score: 3.4
Severity: LOW
Base Score: 2.3
Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Impact Score: 1.4
Exploitability Score: 0.8
Severity: LOW