All cancers are in a way genetic diseases, in that they result from the mutation of normal genes that then go awry and cause the cells to grow into cancers and genes are the basis of hereditary traits.
But you may mean are lymphomas inherited. The answer is generally no although there are examples of clusters in families. They are, however, uncommon.
So the answer is, lymphomas, like other cancers are genetic diseases but in most cases are not inherited.