In the Linux kernel, the following vulnerability has been resolved: schedext: Validate prevcpu in scxbpfselectcpudfl() If a BPF scheduler provides an invalid CPU (outside the nrcpuids range) as prevcpu to scxbpfselectcpudfl() it can cause a kernel crash. To prevent this, validate prevcpu in scxbpfselectcpudfl() and trigger an scx error if an invalid CPU is specified.