[coreboot] Support Question: "overflow detected" error message on start up (boothole?)

Please tell me who I should contact if the following support question should be directed elsewhere.
I have a System 76 computer with coreboot installed. A fine print error message flashes that an "overflow" is detected and I think the file path has "grub" in it. Brief flash, can't see. Is this the boothole vulnerability? It is in the firmware or coreboot, not on a disk grub. I have multiple OS and the message appears independently of loading a particular hard disk, although I have Fedora with the community copr installed on my primary disk. Thanks!