This update for the X Window System client libraries fixes a class of privilege escalation issues. A malicious X Server could send specially crafted data to X clients, which allowed for triggering crashes, or privilege escalation if this relationship was untrusted or crossed user or permission level boundaries. libX11, libXfixes, libXi, libXrandr, libXrender, libXtst, libXv, libXvMC were fixed, specifically: libX11: - CVE-2016-7942: insufficient validation of data from the X server allowed out of boundary memory read libXfixes: - CVE-2016-7944: insufficient validation of data from the X server can cause an integer overflow on 32 bit architectures libXi: - CVE-2016-7945, CVE-2016-7946: insufficient validation of data from the X server can cause out of boundary memory access or endless loops libXtst: - CVE-2016-7951, CVE-2016-7952: insufficient validation of data from the X server can cause out of boundary memory access or endless loops libXv: - CVE-2016-5407: insufficient validation of data from the X server can cause out of boundary memory and memory corruption libXvMC: - CVE-2016-7953: insufficient validation of data from the X server can cause a one byte buffer read underrun libXrender: - CVE-2016-7949, CVE-2016-7950: insufficient validation of data from the X server can cause out of boundary memory writes libXrandr: - CVE-2016-7947, CVE-2016-7948: insufficient validation of data from the X server can cause out of boundary memory writes