CVE-2026-43127 (GCVE-0-2026-43127)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-05-23 16:06
VLAI
Title
ntfs3: fix circular locking dependency in run_unpack_ex
Summary
In 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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 , < b014372b62237521444ee51384549bdf48b79015 (git)
Affected: 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 , < b8d22d9d8260b0f4f4d8e2898c98037c9982ea66 (git)
Affected: 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 , < 08ce2fee1b869ecbfbd94e0eb2630e52203a2e03 (git)
Affected: 57f7979aefdcef66326bda47e07ee0d8be64bf21 (git)
Affected: db7fc56646cafe39599a4c21f1398e2bdfd5c185 (git)
Affected: 6.6.66 , < 6.7 (semver)
Affected: 6.12.5 , < 6.13 (semver)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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    "dateReserved": "2026-05-01T14:12:55.988Z",
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}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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