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CVE-2026-23097

migrate: correct lock ordering for hugetlb file folios

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10, 5.10.249, 5.15.199, 6.1.162, 6.6.122, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 336bf30eb76580b579dc711ded5d599d905c0217 · fixed in e7396d23f9d5739f56cf9ab430c3a169f5508394; From 336bf30eb76580b579dc711ded5d599d905c0217 · fixed in ad97b9a55246eb940a26ac977f80892a395cabf9; From 336bf30eb76580b579dc711ded5d599d905c0217 · fixed in 5edb9854f8df5428b40990a1c7d60507da5bd330; From 336bf30eb76580b579dc711ded5d599d905c0217 · fixed in 526394af4e8ade89cacd1a9ce2b97712712fcc34; From 336bf30eb76580b579dc711ded5d599d905c0217 · fixed in b75070823b89009f5123fd0e05a8e0c3d39937c1; From 336bf30eb76580b579dc711ded5d599d905c0217 · fixed in 1b68efce6dd483d22f50d0d3800c4cfda14b1305; From 336bf30eb76580b579dc711ded5d599d905c0217 · fixed in b7880cb166ab62c2409046b2347261abf701530e; From 5.9.9 · fixed in 5.10

  • Linux Linux

    5.10

  • KernelLinux

    From 5.10.0 · fixed in 5.10.249; From 5.11.0 · fixed in 5.15.199; From 5.16.0 · fixed in 6.1.162; From 6.2.0 · fixed in 6.6.122; From 6.7.0 · fixed in 6.12.68; From 6.13.0 · fixed in 6.18.8

References 7

git.kernel.org