/usr/share/octave/site/m/sundialsTB/cvodes/cvm/ is in octave-sundials 2.5.0-3+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/Contents.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_bjac.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_bjacB.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_djac.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_djacB.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_gcom.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_gcomB.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_gloc.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_glocB.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_jtv.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_jtvB.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_monitor.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_monitorB.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_options.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_pset.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_psetB.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_psol.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_psolB.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_rhs.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_rhsB.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_rhsQ.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_rhsQB.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_rhsS.m
/usr/share/octave/site/m/sundialsTB/cvodes/cvm/cvm_root.m