Ubuntu Security Notice 3646-1 - It was discovered that PHP incorrectly handled opcache access controls when configured to use PHP-FPM. A local user could possibly use this issue to obtain sensitive information from another user's PHP applications. It was discovered that the PHP iconv stream filter incorrect handled certain invalid multibyte sequences. A remote attacker could possibly use this issue to cause PHP to hang, resulting in a denial of service. Various other issues were also addressed.
d594a2d9cf1e36fd38aaa3272f6437dc9d3b16a37c21f734d17412f2ed0403fa