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The six-loop expansions of the renormalization-group functions of $\varphi^4$$n$-vector model with cubic anisotropy are calculated within the minimalsubtraction (MS) scheme in $4 - \varepsilon$ dimensions. The $\varepsilon$expansions for the cubic fixed point coordinates, critical exponentscorresponding to the cubic universality class and marginal order parameterdimensionality $n_c$ separating different regimes of critical behavior arepresented. Since the $\varepsilon$ expansions are divergent numerical estimatesof the quantities of interest are obtained employing proper resummationtechniques. The numbers found are compared with their counterparts obtainedearlier within various field-theoretical approaches and by latticecalculations. In particular, our analysis of $n_c$ strengthens the existingarguments in favor of stability of the cubic fixed point in the physical case$n = 3$.

Six-loop $\varepsilon$ expansion study of three-dimensional $n$-vector model with cubic anisotropy