Vulnerability-Lookup

GHSA-PMPX-W3F2-X2VP

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-08 18:31

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43127"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T12:16:29Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: fix circular locking dependency in run_unpack_ex\n\nSyzbot reported a circular locking dependency between wnd-\u003erw_lock\n(sbi-\u003eused.bitmap) and ni-\u003efile.run_lock.\n\nThe deadlock scenario:\n1. ntfs_extend_mft() takes ni-\u003efile.run_lock then wnd-\u003erw_lock.\n2. run_unpack_ex() takes wnd-\u003erw_lock then tries to acquire\n   ni-\u003efile.run_lock inside ntfs_refresh_zone().\n\nThis creates an AB-BA deadlock.\n\nFix this by using down_read_trylock() instead of down_read() when\nacquiring run_lock in run_unpack_ex(). 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-\u003erw_lock.",
  "id": "GHSA-pmpx-w3f2-x2vp",
  "modified": "2026-05-08T18:31:26Z",
  "published": "2026-05-06T12:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43127"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/08ce2fee1b869ecbfbd94e0eb2630e52203a2e03"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b014372b62237521444ee51384549bdf48b79015"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b8d22d9d8260b0f4f4d8e2898c98037c9982ea66"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-05-11 22:18

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 ?

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/b014372b622375214…
https://git.kernel.org/stable/c/b8d22d9d8260b0f4f…
https://git.kernel.org/stable/c/08ce2fee1b869ecbf…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 , < b014372b62237521444ee51384549bdf48b79015 (git) Affected: 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 , < b8d22d9d8260b0f4f4d8e2898c98037c9982ea66 (git) Affected: 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 , < 08ce2fee1b869ecbfbd94e0eb2630e52203a2e03 (git) Affected: 57f7979aefdcef66326bda47e07ee0d8be64bf21 (git) Affected: db7fc56646cafe39599a4c21f1398e2bdfd5c185 (git)
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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JSON

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        {
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          "programFiles": [
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          "vendor": "Linux",
          "versions": [
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              "version": "5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36",
              "versionType": "git"
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              "version": "5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36",
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.13"
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              "version": "0",
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              "version": "7.0",
              "versionType": "original_commit_for_fix"
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Sightings

Author	Source	Type	Date	Other

Nomenclature

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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GHSA-PMPX-W3F2-X2VP

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

Tags

Sightings

Nomenclature