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CVE-2026-43127

5.5 · MEDIUM

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…

Published May 6, 2026CWE-667EPSS 0.12%

Overview

CVE-2026-43127 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/08ce2fee1b869ecbfbd94e0eb2630e52203a2e03Refgit.kernel.org/stable/c/b014372b62237521444ee51384549bdf48b79015Refgit.kernel.org/stable/c/b8d22d9d8260b0f4f4d8e2898c98037c9982ea66

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43127?

CVE-2026-43127 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43127?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43127?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-43127?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43127 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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