Vulnerability-Lookup

GHSA-58HV-JWV2-HFF3

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-11 21:31

Details

In the Linux kernel, the following vulnerability has been resolved:

nfsd: fix dentry ref leak on V4ROOT export filehandle lookup

nfsd_set_fh_dentry() leaks the dentry reference from exportfs_decode_fh_raw() when the NFS3_FHSIZE or NFS_FHSIZE switch cases detect NFSEXP_V4ROOT and goto out. The out: label calls exp_put() but never dput(dentry), and fhp->fh_dentry was never assigned so fh_put() cannot compensate.

A crafted NFSv3 filehandle targeting a V4ROOT export's fsid triggers the leak on every request.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89683"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:55Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix dentry ref leak on V4ROOT export filehandle lookup\n\nnfsd_set_fh_dentry() leaks the dentry reference from\nexportfs_decode_fh_raw() when the NFS3_FHSIZE or NFS_FHSIZE\nswitch cases detect NFSEXP_V4ROOT and goto out. The out: label\ncalls exp_put() but never dput(dentry), and fhp-\u003efh_dentry was\nnever assigned so fh_put() cannot compensate.\n\nA crafted NFSv3 filehandle targeting a V4ROOT export\u0027s fsid\ntriggers the leak on every request.",
  "id": "GHSA-58hv-jwv2-hff3",
  "modified": "2026-09-11T21:31:36Z",
  "published": "2026-09-11T21:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89683"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-89683 (GCVE-0-2026-89683)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-11 19:46

Title

nfsd: fix dentry ref leak on V4ROOT export filehandle lookup

Summary

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix dentry ref leak on V4ROOT export filehandle lookup nfsd_set_fh_dentry() leaks the dentry reference from exportfs_decode_fh_raw() when the NFS3_FHSIZE or NFS_FHSIZE switch cases detect NFSEXP_V4ROOT and goto out. The out: label calls exp_put() but never dput(dentry), and fhp->fh_dentry was never assigned so fh_put() cannot compensate. A crafted NFSv3 filehandle targeting a V4ROOT export's fsid triggers the leak on every request.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/d493cf57f4c4dae53…
https://git.kernel.org/stable/c/c1ae0f973bcba5730…
https://git.kernel.org/stable/c/11db8df188b34bdb8…
https://git.kernel.org/stable/c/6247023fbbec13250…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 , < d493cf57f4c4dae5396cd6ad41e5c209d0615a81 (git) Affected: ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 , < c1ae0f973bcba5730871e35976a0ab6878fdac34 (git) Affected: ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 , < 11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca (git) Affected: ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 , < 6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a (git)
Linux	Linux	Affected: 6.12 Unaffected: 0 , < 6.12 (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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          "programFiles": [
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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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