{"id":"CVE-2026-23097","state":"PUBLISHED","title":"migrate: correct lock ordering for hugetlb file folios","description":"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_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.","publishedAt":"2026-02-04T16:08:19.815Z","updatedAt":"2026-10-19T18:25:30.652Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"e7396d23f9d5739f56cf9ab430c3a169f5508394","versionType":"git"},{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"ad97b9a55246eb940a26ac977f80892a395cabf9","versionType":"git"},{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"5edb9854f8df5428b40990a1c7d60507da5bd330","versionType":"git"},{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"526394af4e8ade89cacd1a9ce2b97712712fcc34","versionType":"git"},{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"b75070823b89009f5123fd0e05a8e0c3d39937c1","versionType":"git"},{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"1b68efce6dd483d22f50d0d3800c4cfda14b1305","versionType":"git"},{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"b7880cb166ab62c2409046b2347261abf701530e","versionType":"git"},{"version":"ef792d6ce0db6a56e56743b1de1716a982c3b851","status":"affected","versionType":"git"},{"version":"5.9.9","status":"affected","lessThan":"5.10","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/migrate.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.249","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.199","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.162","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.122","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.68","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.8","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/migrate.c"]}],"references":["https://git.kernel.org/stable/c/e7396d23f9d5739f56cf9ab430c3a169f5508394","https://git.kernel.org/stable/c/ad97b9a55246eb940a26ac977f80892a395cabf9","https://git.kernel.org/stable/c/5edb9854f8df5428b40990a1c7d60507da5bd330","https://git.kernel.org/stable/c/526394af4e8ade89cacd1a9ce2b97712712fcc34","https://git.kernel.org/stable/c/b75070823b89009f5123fd0e05a8e0c3d39937c1","https://git.kernel.org/stable/c/1b68efce6dd483d22f50d0d3800c4cfda14b1305","https://git.kernel.org/stable/c/b7880cb166ab62c2409046b2347261abf701530e"],"weaknesses":["CWE-362"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23097.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23097","state":"PUBLISHED","datePublished":"2026-02-04T16:08:19.815Z","dateUpdated":"2026-10-19T18:25:30.652Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.964Z"},"containers":{"cna":{"title":"migrate: correct lock ordering for hugetlb file folios","descriptions":[{"lang":"en","value":"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_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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"e7396d23f9d5739f56cf9ab430c3a169f5508394","versionType":"git"},{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"ad97b9a55246eb940a26ac977f80892a395cabf9","versionType":"git"},{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"5edb9854f8df5428b40990a1c7d60507da5bd330","versionType":"git"},{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"526394af4e8ade89cacd1a9ce2b97712712fcc34","versionType":"git"},{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"b75070823b89009f5123fd0e05a8e0c3d39937c1","versionType":"git"},{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"1b68efce6dd483d22f50d0d3800c4cfda14b1305","versionType":"git"},{"version":"336bf30eb76580b579dc711ded5d599d905c0217","status":"affected","lessThan":"b7880cb166ab62c2409046b2347261abf701530e","versionType":"git"},{"version":"ef792d6ce0db6a56e56743b1de1716a982c3b851","status":"affected","versionType":"git"},{"version":"5.9.9","status":"affected","lessThan":"5.10","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/migrate.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.249","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.199","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.162","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.122","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.68","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.8","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/migrate.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T16:03:50.508Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.10.249"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.15.199"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.1.162"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.6.122"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.12.68"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.18.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9.9"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-23097","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-06-10T20:41:33.152666Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-362","lang":"en","type":"CWE","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T18:25:30.652Z"}}]}}}