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migrate: correct lock ordering for hugetlb file folios (Linux Linux)

CVE-2026-23097
MEDIUM 5.5

At a glance

Source
NVD
EPSS
EPSS 0.10 % · percentile 1 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

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Description

In 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.

Weaknesses (CWE)

  • CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization

References

Scores

VersionScoreVectorScored by
CVSS 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected 336bf30eb76580b579dc711ded5d599d905c0217 < e7396d23f9d5739f56cf9ab430c3a169f5508394 ; affected 336bf30eb76580b579dc711ded5d599d905c0217 < ad97b9a55246eb940a26ac977f80892a395cabf9 ; affected 336bf30eb76580b579dc711ded5d599d905c0217 < 5edb9854f8df5428b40990a1c7d60507da5bd330 ; affected 336bf30eb76580b579dc711ded5d599d905c0217 < 526394af4e8ade89cacd1a9ce2b97712712fcc34 ; affected 336bf30eb76580b579dc711ded5d599d905c0217 < b75070823b89009f5123fd0e05a8e0c3d39937c1 ; affected 336bf30eb76580b579dc711ded5d599d905c0217 < 1b68efce6dd483d22f50d0d3800c4cfda14b1305
Linux · Linuxaffected 5.10 ; unaffected 0 < 5.10 ; unaffected 5.10.249 ≤ 5.10.* ; unaffected 5.15.199 ≤ 5.15.* ; unaffected 6.1.162 ≤ 6.1.* ; unaffected 6.6.122 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD