{"id":"CVE-2025-39754","title":"mm/smaps: fix race between smaps_hugetlb_range and migration","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/smaps: fix race between smaps_hugetlb_range and migration\n\nsmaps_hugetlb_range() handles the pte without holdling ptl, and may be\nconcurrenct with migration, leaing …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 25ee01a2fca02dfb5a3ce316e77910c468108199 < f76089018b34dbe0c2e9b67c5b7d8860668748bb","Linux >= 25ee01a2fca02dfb5a3ce316e77910c468108199 < 2a1f3663974162b8f1e098196f557cfc1d160138","Linux >= 25ee01a2fca02dfb5a3ce316e77910c468108199 < 09fc018f48871123ad5dbd7b03c956580232ed76","Linux >= 25ee01a2fca02dfb5a3ce316e77910c468108199 < b625883ccbcc2b57808db51d1375b1d7b9bcb3e5","Linux >= 25ee01a2fca02dfb5a3ce316e77910c468108199 < 45d19b4b6c2d422771c29b83462d84afcbb33f01","Linux 4.4"],"published":"2025-09-11","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:37:19.186Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39754","references":[{"url":"https://git.kernel.org/stable/c/f76089018b34dbe0c2e9b67c5b7d8860668748bb"},{"url":"https://git.kernel.org/stable/c/2a1f3663974162b8f1e098196f557cfc1d160138"},{"url":"https://git.kernel.org/stable/c/09fc018f48871123ad5dbd7b03c956580232ed76"},{"url":"https://git.kernel.org/stable/c/b625883ccbcc2b57808db51d1375b1d7b9bcb3e5"},{"url":"https://git.kernel.org/stable/c/45d19b4b6c2d422771c29b83462d84afcbb33f01"}],"tags":["cve.org"],"epss":0.00139,"epssPercentile":0.03272,"ingestedAt":"2026-10-21T12:48:53.698Z","slug":"CVE-2025-39754","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmm/smaps: fix race between smaps_hugetlb_range and migration\n\nsmaps_hugetlb_range() handles the pte without holdling ptl, and may be\nconcurrenct with migration, leaing to BUG_ON in pfn_swap_entry_to_page(). \nThe race is as follows.\n\nsmaps_hugetlb_range              migrate_pages\n  huge_ptep_get\n                                   remove_migration_ptes\n\t\t\t\t   folio_unlock\n  pfn_swap_entry_folio\n    BUG_ON\n\nTo fix it, hold ptl lock in smaps_hugetlb_range().\n\n## Affected\n\n- `Linux >= 25ee01a2fca02dfb5a3ce316e77910c468108199 < f76089018b34dbe0c2e9b67c5b7d8860668748bb`\n- `Linux >= 25ee01a2fca02dfb5a3ce316e77910c468108199 < 2a1f3663974162b8f1e098196f557cfc1d160138`\n- `Linux >= 25ee01a2fca02dfb5a3ce316e77910c468108199 < 09fc018f48871123ad5dbd7b03c956580232ed76`\n- `Linux >= 25ee01a2fca02dfb5a3ce316e77910c468108199 < b625883ccbcc2b57808db51d1375b1d7b9bcb3e5`\n- `Linux >= 25ee01a2fca02dfb5a3ce316e77910c468108199 < 45d19b4b6c2d422771c29b83462d84afcbb33f01`\n- `Linux 4.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}