CVE-2026-31501 Linux内核icssg-prueth释放后重用漏洞

/* * PoC Concept for CVE-2026-31501 * This demonstrates the vulnerable logic flow in the driver. */ #include <stdio.h> #include <stdlib.h> #include <string.h> // Mock structures for demonstration struct cppi_desc { int data[2]; }; struct cppi_desc* global_desc; void k3_cppi_desc_pool_free(struct cppi_desc *desc) { printf("[+] Descriptor freed. Memory returned to pool.\n"); free(desc); global_desc = NULL; } void* cppi5_hdesc_get_psdata(struct cppi_desc *desc) { return desc->data; } void emac_rx_timestamp(void *psdata) { // Vulnerability: Accessing freed memory int *data = (int *)psdata; printf("[!] Attempting to access timestamp data: %d, %d\n", data[0], data[1]); // In a real exploit, this could crash the kernel or leak data } void vulnerable_emac_rx_packet() { // 1. Allocate descriptor global_desc = (struct cppi_desc*)malloc(sizeof(struct cppi_desc)); global_desc->data[0] = 0xAAAA; global_desc->data[1] = 0xBBBB; // 2. Get pointer to data void *psdata = cppi5_hdesc_get_psdata(global_desc); // 3. FREE the descriptor (Vulnerable step) k3_cppi_desc_pool_free(global_desc); // 4. Use the pointer after free emac_rx_timestamp(psdata); } int main() { printf("Simulating CVE-2026-31501 Use-After-Free...\n"); vulnerable_emac_rx_packet(); return 0; }