This issue did not affect the versions of ImageMagick as shipped with Kylin Enterprise Linux 7 as they did not include the vulnerable code.
ImageMagick 7.0.8-50 Q16 has a heap-based buffer over-read at MagickCore/pixel-accessor.h in GetPixelChannel.
A heap-based buffer over-read was discovered in ImageMagick in the way it applies a value with arithmetic, relational, or logical operators to an image in GetPixelChannel. Applications compiled against ImageMagick libraries that accept untrustworthy images may be vulnerable to this flaw. An attacker could abuse this flaw by providing a specially crafted image to make the application crash or leak application data.