{"id":"CVE-2026-23097","title":"migrate: correct lock ordering for hugetlb file folios","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmigrate: correct lock ordering for hugetlb file folios\n\nSyzbot has found a deadlock (analyzed by Lance Yang):\n\n1) Task (5749): Holds folio_lock, then tries to acquire i…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < e7396d23f9d5739f56cf9ab430c3a169f5508394","Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < ad97b9a55246eb940a26ac977f80892a395cabf9","Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < 5edb9854f8df5428b40990a1c7d60507da5bd330","Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < 526394af4e8ade89cacd1a9ce2b97712712fcc34","Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < b75070823b89009f5123fd0e05a8e0c3d39937c1","Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < 1b68efce6dd483d22f50d0d3800c4cfda14b1305","Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < b7880cb166ab62c2409046b2347261abf701530e","Linux ef792d6ce0db6a56e56743b1de1716a982c3b851","Linux >= 5.9.9 < 5.10","Linux 5.10"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-10T20:41:33.152666Z"},"published":"2026-02-04","updated":"2026-10-19","sourceUpdated":"2026-10-19T18:25:30.652Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23097","references":[{"url":"https://git.kernel.org/stable/c/e7396d23f9d5739f56cf9ab430c3a169f5508394"},{"url":"https://git.kernel.org/stable/c/ad97b9a55246eb940a26ac977f80892a395cabf9"},{"url":"https://git.kernel.org/stable/c/5edb9854f8df5428b40990a1c7d60507da5bd330"},{"url":"https://git.kernel.org/stable/c/526394af4e8ade89cacd1a9ce2b97712712fcc34"},{"url":"https://git.kernel.org/stable/c/b75070823b89009f5123fd0e05a8e0c3d39937c1"},{"url":"https://git.kernel.org/stable/c/1b68efce6dd483d22f50d0d3800c4cfda14b1305"},{"url":"https://git.kernel.org/stable/c/b7880cb166ab62c2409046b2347261abf701530e"}],"tags":["cve.org"],"epss":0.00134,"epssPercentile":0.02572,"ingestedAt":"2026-10-19T18:35:50.104Z","slug":"CVE-2026-23097","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmigrate: correct lock ordering for hugetlb file folios\n\nSyzbot has found a deadlock (analyzed by Lance Yang):\n\n1) Task (5749): Holds folio_lock, then tries to acquire i_mmap_rwsem(read lock).\n2) Task (5754): Holds i_mmap_rwsem(write lock), then tries to acquire\nfolio_lock.\n\nmigrate_pages()\n  -> migrate_hugetlbs()\n    -> unmap_and_move_huge_page()     <- Takes folio_lock!\n      -> remove_migration_ptes()\n        -> __rmap_walk_file()\n          -> i_mmap_lock_read()       <- Waits for i_mmap_rwsem(read lock)!\n\nhugetlbfs_fallocate()\n  -> hugetlbfs_punch_hole()           <- Takes i_mmap_rwsem(write lock)!\n    -> hugetlbfs_zero_partial_page()\n     -> filemap_lock_hugetlb_folio()\n      -> filemap_lock_folio()\n        -> __filemap_get_folio        <- Waits for folio_lock!\n\nThe migration path is the one taking locks in the wrong order according to\nthe documentation at the top of mm/rmap.c.  So expand the scope of the\nexisting i_mmap_lock to cover the calls to remove_migration_ptes() too.\n\nThis is (mostly) how it used to be after commit c0d0381ade79.  That was\nremoved by 336bf30eb765 for both file & anon hugetlb pages when it should\nonly have been removed for anon hugetlb pages.\n\n## Affected\n\n- `Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < e7396d23f9d5739f56cf9ab430c3a169f5508394`\n- `Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < ad97b9a55246eb940a26ac977f80892a395cabf9`\n- `Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < 5edb9854f8df5428b40990a1c7d60507da5bd330`\n- `Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < 526394af4e8ade89cacd1a9ce2b97712712fcc34`\n- `Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < b75070823b89009f5123fd0e05a8e0c3d39937c1`\n- `Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < 1b68efce6dd483d22f50d0d3800c4cfda14b1305`\n- `Linux >= 336bf30eb76580b579dc711ded5d599d905c0217 < b7880cb166ab62c2409046b2347261abf701530e`\n- `Linux ef792d6ce0db6a56e56743b1de1716a982c3b851`\n- `Linux >= 5.9.9 < 5.10`\n- `Linux 5.10`\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":[]}