CVE-2026-43308 Linux内核btrfs拒绝服务漏洞

/* * PoC for CVE-2026-43308 (Conceptual) * Triggering unexpected delayed ref type in btrfs. * Compile: gcc -o poc_btrfs poc_btrfs.c */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <linux/btrfs.h> int main(int argc, char *argv[]) { if (argc != 2) { printf("Usage: %s <mounted_btrfs_path>\n", argv[0]); return 1; } int fd = open(argv[1], O_RDONLY); if (fd < 0) { perror("open"); return 1; } // In a real exploitation scenario, specific ioctls or file system // operations are used to manipulate delayed refs to reach the // unexpected type condition in run_one_delayed_ref(). // This demonstrates the interface to interact with the filesystem. printf("Attempting to interact with btrfs volume at %s\n", argv[1]); // Logic to trigger the specific delayed ref state would go here. // This often involves creating snapshots, clones, or modifying // extents in a way that races or confuses the reference tracking. close(fd); printf("PoC executed. Check kernel logs for panic or BUG() messages.\n"); return 0; }