Sorry for the late reply: It depends on the copyright the software has. Some copyright has “GPLv2 or later”/“GPLv3 or later”; other copyright (such as the Linu

Sorry for the late reply: It depends on the copyright the software has. Some copyright has “GPLv2 or later”/“GPLv3 or later”; other copyright (such as the Linux kernel) is “GPLv2 only”. CLAs like this are not that uncommon; the Free Software Foundation (FSF) famously requires all patches over 10 lines long (or so) to have a formal copyright assignment given to them.