migrate: correct lock ordering for hugetlb file folios

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-23097
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-04 17:16:20 UTC
Updated2026-10-19 19:17:36 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: migrate: correct lock ordering for hugetlb file folios Syzbot has found a deadlock (analyzed by Lance Yang): 1) Task (5749): Holds folio_lock, then tries to acquire i_mmap_rwsem(read lock). 2) Task (5754): Holds i_mmap_rwsem(write lock), then tries to acquire folio_lock. migrate_pages() -> migrate_hugetlbs() -> unmap_and_move_huge_page() <- Takes folio_lock! -> remove_migration_ptes() -> __rmap_walk_file() -> i_mmap_lock_read() <- Waits for i_mmap_rwsem(read lock)! hugetlbfs_fallocate() -> hugetlbfs_punch_hole() <- Takes i_mmap_rwsem(write lock)! -> hugetlbfs_zero_partial_page() -> filemap_lock_hugetlb_folio() -> filemap_lock_folio() -> __filemap_get_folio <- Waits for folio_lock! The migration path is the one taking locks in the wrong order according to the documentation at the top of mm/rmap.c. So expand the scope of the existing i_mmap_lock to cover the calls to remove_migration_ptes() too. This is (mostly) how it used to be after commit c0d0381ade79. That was removed by 336bf30eb765 for both file & anon hugetlb pages when it should only have been removed for anon hugetlb pages.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo | CWE-362 | CWE-362 CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 336bf30eb76580b579dc711ded5d599d905c0217 e7396d23f9d5739f56cf9ab430c3a169f5508394 git Not specified
CNA Linux Linux affected 336bf30eb76580b579dc711ded5d599d905c0217 ad97b9a55246eb940a26ac977f80892a395cabf9 git Not specified
CNA Linux Linux affected 336bf30eb76580b579dc711ded5d599d905c0217 5edb9854f8df5428b40990a1c7d60507da5bd330 git Not specified
CNA Linux Linux affected 336bf30eb76580b579dc711ded5d599d905c0217 526394af4e8ade89cacd1a9ce2b97712712fcc34 git Not specified
CNA Linux Linux affected 336bf30eb76580b579dc711ded5d599d905c0217 b75070823b89009f5123fd0e05a8e0c3d39937c1 git Not specified
CNA Linux Linux affected 336bf30eb76580b579dc711ded5d599d905c0217 1b68efce6dd483d22f50d0d3800c4cfda14b1305 git Not specified
CNA Linux Linux affected 336bf30eb76580b579dc711ded5d599d905c0217 b7880cb166ab62c2409046b2347261abf701530e git Not specified
CNA Linux Linux affected ef792d6ce0db6a56e56743b1de1716a982c3b851 git Not specified
CNA Linux Linux affected 5.9.9 5.10 semver Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 5.10.249 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.199 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.162 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.122 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.68 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.8 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e7396d23f9d5739f56cf9ab430c3a169f5508394 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5edb9854f8df5428b40990a1c7d60507da5bd330 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b75070823b89009f5123fd0e05a8e0c3d39937c1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ad97b9a55246eb940a26ac977f80892a395cabf9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b7880cb166ab62c2409046b2347261abf701530e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1b68efce6dd483d22f50d0d3800c4cfda14b1305 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/526394af4e8ade89cacd1a9ce2b97712712fcc34 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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