X.Org Server (aka xserver and xorg-server) before 1.16.3 and 1.17.x before 1.17.1 allows remote attackers to obtain sensitive information from process memory or cause a denial of service (crash) via a crafted string length value in a XkbSetGeometry request.
http://advisories.mageia.org/MGASA-2015-0073.html
http://lists.opensuse.org/opensuse-updates/2015-02/msg00085.html
http://lists.opensuse.org/opensuse-updates/2015-02/msg00086.html
http://rhn.redhat.com/errata/RHSA-2015-0797.html
https://security.gentoo.org/glsa/201504-06
http://www.debian.org/security/2015/dsa-3160
http://www.mandriva.com/security/advisories?name=MDVSA-2015:119
http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
http://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html
http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html