{"uuid": "d19c2ce4-dbfa-47a0-a967-6367fe99d926", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-37818", "type": "published-proof-of-concept", "source": "https://t.me/DarkWebInformer_CVEAlerts/15491", "content": "\ud83d\udd17 DarkWebInformer.com - Cyber Threat Intelligence\n\ud83d\udccc CVE ID: CVE-2025-37818\n\ud83d\udd25 CVSS Score: N/A\n\ud83d\udd39 Description: In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Return NULL from huge_pte_offset() for invalid PMD\n\nLoongArch's huge_pte_offset() currently returns a pointer to a PMD slot\neven if the underlying entry points to invalid_pte_table (indicating no\nmapping). Callers like smaps_hugetlb_range() fetch this invalid entry\nvalue (the address of invalid_pte_table) via this pointer.\n\nThe generic is_swap_pte() check then incorrectly identifies this address\nas a swap entry on LoongArch, because it satisfies the \"!pte_present()\n&& !pte_none()\" conditions. This misinterpretation, combined with a\ncoincidental match by is_migration_entry() on the address bits, leads to\nkernel crashes in pfn_swap_entry_to_page().\n\nFix this at the architecture level by modifying huge_pte_offset() to\ncheck the PMD entry's content using pmd_none() before returning. If the\nentry is invalid (i.e., it points to invalid_pte_table), return NULL\ninstead of the pointer to the slot.\n\ud83d\udccf Published: 2025-05-08T06:26:13.322Z\n\ud83d\udccf Modified: 2025-05-08T06:26:13.322Z\n\ud83d\udd17 References:\n1. https://git.kernel.org/stable/c/34256805720993e37adf6127371a1265aea8376a\n2. https://git.kernel.org/stable/c/2ca9380b12711afe95b3589bd82b59623b3c96b3\n3. https://git.kernel.org/stable/c/51424fd171cee6a33f01f7c66b8eb23ac42289d4\n4. https://git.kernel.org/stable/c/b49f085cd671addbda4802d6b9382513f7dd0f30\n5. https://git.kernel.org/stable/c/bd51834d1cf65a2c801295d230c220aeebf87a73", "creation_timestamp": "2025-05-08T07:23:16.000000Z"}