{"vulnerability": "CVE-2025-37818", "sightings": [{"uuid": "d9a4f55f-c614-4b9d-b35d-0d72abca093a", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-37818", "type": "seen", "source": "https://t.me/cvedetector/24804", "content": "{\n  \"Source\": \"CVE FEED\",\n  \"Title\": \"CVE-2025-37818 - LoongArch Linux Kernel Invalid PMD Pointer Dereference Vulnerability\", \n  \"Content\": \"CVE ID : CVE-2025-37818 \nPublished : May 8, 2025, 7:15 a.m. | 2\u00a0hours, 2\u00a0minutes ago \nDescription : 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. \nSeverity: 0.0 | NA \nVisit the link for more details, such as CVSS details, affected products, timeline, and more...\",\n  \"Detection Date\": \"08 May 2025\",\n  \"Type\": \"Vulnerability\"\n}\n\ud83d\udd39 t.me/cvedetector \ud83d\udd39", "creation_timestamp": "2025-05-08T11:45:01.000000Z"}, {"uuid": "1c842eb0-8a1d-4112-ac19-c5fb580b3b53", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-37818", "type": "seen", "source": "https://bsky.app/profile/cve.skyfleet.blue/post/3loniqqtvxp2h", "content": "", "creation_timestamp": "2025-05-08T08:31:35.709763Z"}, {"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"}]}