CVE-2026-43127

MediumCVSS 5.5/10Last modified Nov 11, 2026

Description

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-667

Affected software

VendorProductVersions
LinuxLinux>= 57f7979aefdcef66326bda47e07ee0d8be64bf21, < d60f09d2d16c44a797d8cb67015cde2508720506; >= db7fc56646cafe39599a4c21f1398e2bdfd5c185, < 76016d15bbd90caa0ce7765fddf9bde8e943e601; >= 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36, < b014372b62237521444ee51384549bdf48b79015; >= 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36, < b8d22d9d8260b0f4f4d8e2898c98037c9982ea66; >= 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36, < 08ce2fee1b869ecbfbd94e0eb2630e52203a2e03; >= 6.6.66, < 6.6.160; >= 6.12.5, < 6.12.114
LinuxLinux6.13

References

Timeline

Published
May 6, 2026
Last modified
Nov 11, 2026
NVD status
Modified

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CVE-2026-43127: Medium severity, CVSS 5.5 | Vulnix