CVE-2026-31566 Linux内核amdgpu驱动UAF漏洞

/* * Conceptual PoC illustrating the vulnerable logic flow. * This requires a local environment with the vulnerable kernel and AMD GPU. */ #include <stdio.h> #include <stdlib.h> // Simulated kernel structures for demonstration struct dma_fence { int refcount; }; void dma_fence_put(struct dma_fence *f) { f->refcount--; if (f->refcount == 0) { free(f); // Memory is freed here in the vulnerable scenario printf("[DEBUG] Fence memory freed.\n"); } } void dma_fence_wait(struct dma_fence *f) { // In the real vulnerability, this accesses the freed memory printf("[DEBUG] Waiting on fence... Use-After-Free occurs here!\n"); } void vulnerable_submit_ib() { struct dma_fence *f = (struct dma_fence *)malloc(sizeof(struct dma_fence)); f->refcount = 1; printf("[DEBUG] Submitting IB and getting fence...\n"); // Vulnerability sequence: Put before Wait dma_fence_put(f); // f is potentially freed here. Accessing it is UAF. dma_fence_wait(f); } int main() { printf("Simulating CVE-2026-31566 Vulnerability Logic...\n"); vulnerable_submit_ib(); return 0; }