Medium 5.5Published May 6, 2026

CVE-2026-43127ntfs3: fix circular locking dependency in run_unpack_ex

Updated under an hour ago (Oct 28, 2026, 4:40 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 57f7979aefdcef66326bda47e07ee0d8be64bf21 before d60f09d2d16c44a797d8cb67015cde2508720506; from db7fc56646cafe39599a4c21f1398e2bdfd5c185 before 76016d15bbd90caa0ce7765fddf9bde8e943e601; from 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 before b014372b62237521444ee51384549bdf48b79015; from 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 before b8d22d9d8260b0f4f4d8e2898c98037c9982ea66; from 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 before 08ce2fee1b869ecbfbd94e0eb2630e52203a2e03; from 6.6.66 before 6.6.160; from 6.12.5 before 6.12.114	CNA record
linux linux_kernel linux:linux_kernel	from 6.6.66 before 6.18.16; from 6.19 before 6.19.6	NVD

References

References

https://git.kernel.org/stable/c/d60f09d2d16c44a797d8cb67015cde2508720506
https://git.kernel.org/stable/c/76016d15bbd90caa0ce7765fddf9bde8e943e601
https://git.kernel.org/stable/c/b014372b62237521444ee51384549bdf48b79015	patch
https://git.kernel.org/stable/c/b8d22d9d8260b0f4f4d8e2898c98037c9982ea66	patch
https://git.kernel.org/stable/c/08ce2fee1b869ecbfbd94e0eb2630e52203a2e03	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.