Is it permissible to modify and redistribute the Linux kernel source code?

The Linux kernel is released under the GNU General Public License (GPL), which permits users to modify the source code and redistribute their modified versions, provided they also make the source code available to others. This ensures that the freedoms granted by the GPL are preserved for all users. The stipulation that the source code must remain available is essential because it allows others to study, change, and improve the software. By doing so, the collaborative nature of the Linux community is maintained, allowing for continuous innovation and enhancement of the kernel.