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

Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2026-08-05 12:09
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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            "version": "3.1"
          },
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              "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."
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    "dateUpdated": "2026-08-05T12:09:37.288Z",
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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."
          }
        ],
        "id": "CVE-2025-40324",
        "lastModified": "2026-07-30T06:24:29.327",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        "published": "2025-12-08T01:16:05.197",
        "references": [
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            "url": "https://git.kernel.org/stable/c/03524ccff698d4a77d096ed529073d91f5edee5d"
          },
          {
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            "url": "https://git.kernel.org/stable/c/2ac46606b2cc49e78d8e3d8f2685e79e9ba73020"
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          },
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            "url": "https://git.kernel.org/stable/c/a4948875ed0599c037dc438c11891c9012721b1d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/abb1f08a2121dd270193746e43b2a9373db9ad84"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:38:41+00:00",
      "cve": "CVE-2025-40324",
      "id": "CVE-2025-40324",
      "initial_release_date": "2025-12-08T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NFSD: Fix crash in nfsd4_read_release()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40324.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T16:54:02Z",
      "cve": "CVE-2025-40324",
      "id": "CVE-2025-40324",
      "initial_release_date": "2025-12-09T00:24:03Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "522",
      "product_status:known_not_affected": "301",
      "product_status:recommended": "384",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40324",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40324.json",
      "version": "31"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.