The Linux Kernel is provided under: SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note Being under the terms of the GNU General Public License version 2 only, according with: LICENSES/preferred/GPL-2.0 With an explicit syscall exception, as stated at: LICENSES/exceptions/Linux-syscall-note In addition, other licenses may also apply. Please see: Documentation/process/license-rules.rst for more details.