ntfs3: fix circular locking dependency in run_unpack_ex

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Summary

CVECVE-2026-43127
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:29 UTC
Updated2026-05-08 17:54:46 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ntfs3: fix circular locking dependency in run_unpack_ex Syzbot reported a circular locking dependency between wnd->rw_lock (sbi->used.bitmap) and ni->file.run_lock. The deadlock scenario: 1. ntfs_extend_mft() takes ni->file.run_lock then wnd->rw_lock. 2. run_unpack_ex() takes wnd->rw_lock then tries to acquire ni->file.run_lock inside ntfs_refresh_zone(). This creates an AB-BA deadlock. Fix this by using down_read_trylock() instead of down_read() when acquiring run_lock in run_unpack_ex(). If the lock is contended, skip ntfs_refresh_zone() - the MFT zone will be refreshed on the next MFT operation. This breaks the circular dependency since we never block waiting for run_lock while holding wnd->rw_lock.

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: CWE-667

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 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 b014372b62237521444ee51384549bdf48b79015 git Not specified
CNA Linux Linux affected 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 b8d22d9d8260b0f4f4d8e2898c98037c9982ea66 git Not specified
CNA Linux Linux affected 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 08ce2fee1b869ecbfbd94e0eb2630e52203a2e03 git Not specified
CNA Linux Linux affected 57f7979aefdcef66326bda47e07ee0d8be64bf21 git Not specified
CNA Linux Linux affected db7fc56646cafe39599a4c21f1398e2bdfd5c185 git Not specified
CNA Linux Linux affected 6.13 Not specified
CNA Linux Linux unaffected 6.13 semver Not specified
CNA Linux Linux unaffected 6.18.16 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.6 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/08ce2fee1b869ecbfbd94e0eb2630e52203a2e03 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b8d22d9d8260b0f4f4d8e2898c98037c9982ea66 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b014372b62237521444ee51384549bdf48b79015 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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