CVE-2026-33999 X.Org X Server XKB整数下溢漏洞

#include <X11/Xlib.h> #include <X11/XKBlib.h> #include <stdio.h> /* * PoC for CVE-2026-33999 * Conceptual demonstration of triggering the integer underflow * in X.Org X Server XKB compatibility map handling. */ int main() { Display *dpy = XOpenDisplay(NULL); if (!dpy) { fprintf(stderr, "Unable to connect to X server\n"); return 1; } // Craft malicious data to trigger underflow in XKB map // This typically involves manipulating the size or offset fields // in the XkbSetCompatMap request. // Pseudo-code for the malicious request structure // char *payload = prepare_malicious_xkb_payload(); // XkbSetCompatMap(dpy, XkbCompatMapMask, payload); printf("Sending crafted XKB request to trigger vulnerability...\n"); XCloseDisplay(dpy); return 0; }