The term unintended instructions is common in the infosec community and was (as far as I know) popularized by the seminal paper on ROP https://hovav.net/ucsd/di

The term unintended instructions is common in the infosec community and was (as far as I know) popularized by the seminal paper on ROP https://hovav.net/ucsd/dist/geometry.pdf https://hovav.net/ucsd/dist/geometry.pdf I'm sure different terms are used in other communities.