Vulnerability-Lookup

GHSA-CFR4-FRVG-X3C3

Vulnerability from github – Published: 2025-12-08 03:31 – Updated: 2026-07-30 06:32

Details

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

NFSD: Fix crash in nfsd4_read_release()

When tracing is enabled, the trace_nfsd_read_done trace point crashes during the pynfs read.testNoFh test.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40324"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-08T01:16:05Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Fix crash in nfsd4_read_release()\n\nWhen tracing is enabled, the trace_nfsd_read_done trace point\ncrashes during the pynfs read.testNoFh test.",
  "id": "GHSA-cfr4-frvg-x3c3",
  "modified": "2026-07-30T06:32:23Z",
  "published": "2025-12-08T03:31:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40324"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03524ccff698d4a77d096ed529073d91f5edee5d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ac46606b2cc49e78d8e3d8f2685e79e9ba73020"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/375fdd8993cecc48afa359728a6e70b280dde1c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8f244b773c63fa480c9a3bd1ae04f5272f285e89"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/930cb4fe3ab4061be31f20ee30bb72a66f7bb6d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4948875ed0599c037dc438c11891c9012721b1d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/abb1f08a2121dd270193746e43b2a9373db9ad84"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-40324 (GCVE-0-2025-40324)

Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2026-08-05 12:09

Title

NFSD: Fix crash in nfsd4_read_release()

Summary

In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix crash in nfsd4_read_release() When tracing is enabled, the trace_nfsd_read_done trace point crashes during the pynfs read.testNoFh test.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/930cb4fe3ab4061be…
https://git.kernel.org/stable/c/375fdd8993cecc48a…
https://git.kernel.org/stable/c/2ac46606b2cc49e78…
https://git.kernel.org/stable/c/03524ccff698d4a77…
https://git.kernel.org/stable/c/a4948875ed0599c03…
https://git.kernel.org/stable/c/8f244b773c63fa480…
https://git.kernel.org/stable/c/abb1f08a2121dd270…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 65a33135e91e6dd661ecdf1194b9d90c49ae3570 , < 930cb4fe3ab4061be31f20ee30bb72a66f7bb6d1 (git) Affected: b11d8162c24af4a351d21e2c804d25ca493305e3 , < 375fdd8993cecc48afa359728a6e70b280dde1c8 (git) Affected: b623a8e5d38a69a3ef8644acb1030dd7c7bc28b3 , < 2ac46606b2cc49e78d8e3d8f2685e79e9ba73020 (git) Affected: 15a8b55dbb1ba154d82627547c5761cac884d810 , < 03524ccff698d4a77d096ed529073d91f5edee5d (git) Affected: 15a8b55dbb1ba154d82627547c5761cac884d810 , < a4948875ed0599c037dc438c11891c9012721b1d (git) Affected: 15a8b55dbb1ba154d82627547c5761cac884d810 , < 8f244b773c63fa480c9a3bd1ae04f5272f285e89 (git) Affected: 15a8b55dbb1ba154d82627547c5761cac884d810 , < abb1f08a2121dd270193746e43b2a9373db9ad84 (git) Affected: 3d0dcada384af22dec764c8374a2997870ec86ae (git) Affected: 5.10.220 , < 5.10.247 (semver) Affected: 5.15.154 , < 5.15.197 (semver) Affected: 6.1.24 , < 6.1.159 (semver) Affected: 6.2.11 , < 6.3 (semver)
Linux	Linux	Affected: 6.3 Unaffected: 0 , < 6.3 (semver) Unaffected: 5.10.247 , ≤ 5.10.* (semver) Unaffected: 5.15.197 , ≤ 5.15.* (semver) Unaffected: 6.1.159 , ≤ 6.1.* (semver) Unaffected: 6.6.117 , ≤ 6.6.* (semver) Unaffected: 6.12.58 , ≤ 6.12.* (semver) Unaffected: 6.17.8 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4proc.c"
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          "vendor": "Linux",
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              "versionType": "git"
            },
            {
              "lessThan": "2ac46606b2cc49e78d8e3d8f2685e79e9ba73020",
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              "versionType": "git"
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              "versionType": "git"
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              "versionType": "git"
            },
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              "versionType": "git"
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              "versionType": "semver"
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              "status": "affected",
              "version": "6.2.11",
              "versionType": "semver"
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.3"
            },
            {
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              "version": "6.6.117",
              "versionType": "semver"
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.17.8",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
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      "cpeApplicability": [
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                {
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                  "versionStartIncluding": "6.3",
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                },
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                  "versionStartIncluding": "6.2.11",
                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Fix crash in nfsd4_read_release()\n\nWhen tracing is enabled, the trace_nfsd_read_done trace point\ncrashes during the pynfs read.testNoFh test."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bug is in the in-kernel NFS server\u0027s NFSv4 COMPOUND processing, triggered entirely by attacker-supplied RPC data arriving on TCP port 2049. No local access is needed \u2014 a crafted COMPOUND from any host that can reach nfsd is sufficient.\nAC:L - Within the vulnerable configuration (nfsd read tracepoints enabled, the configuration CVSS directs us to score), a single well-formed `COMPOUND{READ}` with no preceding PUTFH triggers the NULL dereference deterministically \u2014 no race, no memory-layout dependency, no timing window, and the attacker fully controls the request.\nPR:N - The crash occurs before any authorization gate: no filehandle, no stateid, no session/clientid, and no export access check is reached, and AUTH_SYS verifies no credentials. The NFSv4.1 `nfserr_op_not_in_session` path (nfs4proc.c:3087-3093) fires before session establishment, making this a pre-authentication code path.\nUI:N - The attacker sends the malformed COMPOUND directly to the NFS server; no administrator or client-side action is required at exploitation time.\nS:U - The NULL dereference oops occurs in the nfsd kthread within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - `nfsd4_decode_read()` memsets the whole `struct nfsd4_read`, so `rd_rqstp`/`rd_fhp` are guaranteed NULL rather than stale pointers \u2014 the fault occurs on the first access and no data is read into the trace buffer or otherwise disclosed.\nI:N - The tracepoint\u0027s `TP_fast_assign` performs only loads from the NULL pointers; there is no out-of-bounds or use-after-free write and no control-flow hijack primitive.\nA:H - A NULL pointer dereference oops kills the nfsd kernel thread mid-compound (leaking the unreleased current_fh/save_fh references), and the request can be replayed to exhaust every nfsd thread; with panic_on_oops set it is an immediate kernel panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:09:37.288Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        },
        {
          "url": "https://git.kernel.org/stable/c/abb1f08a2121dd270193746e43b2a9373db9ad84"
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    "datePublished": "2025-12-08T00:46:51.912Z",
    "dateReserved": "2025-04-16T07:20:57.186Z",
    "dateUpdated": "2026-08-05T12:09:37.288Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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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