CVE-2026-34003 X.Org X Server越界内存访问漏洞

/* * PoC for CVE-2026-34003: X.Org X Server XKB Key Types OOB * This is a conceptual proof of concept. * Compile with: gcc -o poc_xkb poc_xkb.c -lX11 */ #include <X11/Xlib.h> #include <X11/XKBlib.h> #include <stdio.h> #include <stdlib.h> int main() { Display *dpy; // Attempt to connect to the X server dpy = XOpenDisplay(NULL); if (!dpy) { fprintf(stderr, "Cannot open display\n"); return 1; } printf("Connected to X Server. Sending malformed XKB request...\n"); // Note: Actual exploitation requires crafting a specific XKB protocol request // that triggers the out-of-bounds access. This usually involves manipulating // the length fields in the XKBGetTypeInfo or similar requests. // In a real exploit scenario, one would use a custom buffer: // char buffer[1024]; // memset(buffer, 0x41, sizeof(buffer)); // Fill with 'A' // Send request via XSendEvent or direct protocol manipulation... // For demonstration, we just check XKB extension presence int major, minor, opcode, event, error; if (XkbQueryExtension(dpy, &opcode, &event, &error, &major, &minor)) { printf("XKB extension found. Version: %d.%d\n", major, minor); printf("Vulnerability CVE-2026-34003 may be exploitable.\n"); } else { printf("XKB extension not found.\n"); } XCloseDisplay(dpy); return 0; }