Vulnerability-Lookup

GHSA-PQVP-PFWP-HF4C

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: validate nseconds in TIME_DELEG decode paths

The xdrgen-based TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode arms store a raw uint32_t nseconds directly into tv_nsec without enforcing nseconds < NSEC_PER_SEC. The legacy nfsd4_decode_nfstime4 has this check but the TIME_DELEG paths do not. A malformed timespec can propagate through notify_change() to disk.

Add range checks in both nfs4xdr.c (SETATTR path) and nfs4callback.c (CB_GETATTR path).

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89701"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:57Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: validate nseconds in TIME_DELEG decode paths\n\nThe xdrgen-based TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode arms\nstore a raw uint32_t nseconds directly into tv_nsec without enforcing\nnseconds \u003c NSEC_PER_SEC. The legacy nfsd4_decode_nfstime4 has this\ncheck but the TIME_DELEG paths do not. A malformed timespec can\npropagate through notify_change() to disk.\n\nAdd range checks in both nfs4xdr.c (SETATTR path) and\nnfs4callback.c (CB_GETATTR path).",
  "id": "GHSA-pqvp-pfwp-hf4c",
  "modified": "2026-09-11T21:31:37Z",
  "published": "2026-09-11T21:31:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89701"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f4a767340fad392bd656115b8752005518c9065"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5eb489831a9fd4754f4baf26e6989efb66ce104c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e7b93da7fa2e77f977096251899d1410986adf6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-89701 (GCVE-0-2026-89701)

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

Title

nfsd: validate nseconds in TIME_DELEG decode paths

Summary

In the Linux kernel, the following vulnerability has been resolved: nfsd: validate nseconds in TIME_DELEG decode paths The xdrgen-based TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode arms store a raw uint32_t nseconds directly into tv_nsec without enforcing nseconds < NSEC_PER_SEC. The legacy nfsd4_decode_nfstime4 has this check but the TIME_DELEG paths do not. A malformed timespec can propagate through notify_change() to disk. Add range checks in both nfs4xdr.c (SETATTR path) and nfs4callback.c (CB_GETATTR path).

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/7e7b93da7fa2e77f9…
https://git.kernel.org/stable/c/5eb489831a9fd4754…
https://git.kernel.org/stable/c/0f4a767340fad392b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6ae30d6eb26bce02c48c60074b4306270e2434c1 , < 7e7b93da7fa2e77f977096251899d1410986adf6 (git) Affected: 6ae30d6eb26bce02c48c60074b4306270e2434c1 , < 5eb489831a9fd4754f4baf26e6989efb66ce104c (git) Affected: 6ae30d6eb26bce02c48c60074b4306270e2434c1 , < 0f4a767340fad392bd656115b8752005518c9065 (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (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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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4callback.c",
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              "versionType": "git"
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              "status": "affected",
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          "versions": [
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              "version": "7.2.4",
              "versionType": "semver"
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              "operator": "OR"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: validate nseconds in TIME_DELEG decode paths\n\nThe xdrgen-based TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode arms\nstore a raw uint32_t nseconds directly into tv_nsec without enforcing\nnseconds \u003c NSEC_PER_SEC. The legacy nfsd4_decode_nfstime4 has this\ncheck but the TIME_DELEG paths do not. A malformed timespec can\npropagate through notify_change() to disk.\n\nAdd range checks in both nfs4xdr.c (SETATTR path) and\nnfs4callback.c (CB_GETATTR path)."
        }
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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