CVE-2026-43127

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 v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/08ce2fee1b869ecbfbd94e0eb2630e52203a2e03	Patch
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/d60f09d2d16c44a797d8cb67015cde2508720506

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

History

21 Oct 2026, 13:18

Type	Values Removed	Values Added
References		() https://git.kernel.org/stable/c/76016d15bbd90caa0ce7765fddf9bde8e943e601 - () https://git.kernel.org/stable/c/d60f09d2d16c44a797d8cb67015cde2508720506 -

Information

Published : 2026-05-06 12:16

Updated : 2026-10-21 13:18

NVD link : CVE-2026-43127

Mitre link : CVE-2026-43127

CVE.ORG link : CVE-2026-43127

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-667

Improper Locking

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If the lock is contended,\nskip ntfs_refresh_zone() - the MFT zone will be refreshed on the\nnext MFT operation. This breaks the circular dependency since we\nnever block waiting for run_lock while holding wnd->rw_lock."}], "lastModified": "2026-10-21T13:18:50.337", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C8B0BDB8-5231-48C2-9E23-019AE9ADD6EF", "versionEndExcluding": "6.18.16", "versionStartIncluding": "6.6.66"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67", "versionEndExcluding": "6.19.6", "versionStartIncluding": "6.19"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}