CVE-2026-31502 Linux Kernel team驱动类型混淆漏洞

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/if.h> #include <linux/netlink.h> #include <linux/rtnetlink.h> // Simplified PoC concept to reproduce the topology: gre -> bond -> team // This requires root privileges to manipulate network interfaces. void send_netlink_msg(int sock, struct nlmsghdr *nlh) { send(sock, nlh, nlh->nlmsg_len, 0); } int main() { int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (sock < 0) { perror("socket"); return 1; } struct sockaddr_nl src_addr; memset(&src_addr, 0, sizeof(src_addr)); src_addr.nl_family = AF_NETLINK; bind(sock, (struct sockaddr *)&src_addr, sizeof(src_addr)); // 1. Create a GRE interface (Non-Ethernet) printf("[*] Creating GRE interface...\n"); // Code to create 'gre0' would go here using RTM_NEWLINK // 2. Create a Bonding interface printf("[*] Creating Bonding interface...\n"); // Code to create 'bond0' and enslave gre0 would go here // 3. Create a Team interface printf("[*] Creating Team interface...\n"); // Code to create 'team0' and enslave bond0 would go here // This triggers the vulnerable path in team_setup_by_port // 4. Trigger the vulnerability // Sending traffic that invokes dev_hard_header() on the team device // causes the crash because bond_header_create runs with team's net_device. printf("[*] Triggering header_ops confusion...\n"); close(sock); return 0; }