Gentoo Linux Security Advisory 201405-7 - Multiple vulnerabilities have been found in X.Org X Server, allowing attackers to execute arbitrary code or cause a Denial of Service condition. Versions less than 1.14.3-r2 are affected.
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Ubuntu Security Notice 1990-1 - Pedro Ribeiro discovered that the X.Org X server incorrectly handled memory operations when handling ImageText requests. An attacker could use this issue to cause X.Org to crash, or to possibly execute arbitrary code. It was discovered that non-root X.Org X servers such as Xephyr incorrectly used cached xkb files. A local attacker could use this flaw to cause a xkb cache file to be loaded by another user, resulting in a denial of service. Various other issues were also addressed.
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