CVE-2025-40087 (GCVE-0-2025-40087)

Vulnerability from cvelistv5 – Published: 2025-10-30 09:47 – Updated: 2026-08-05 12:07
VLAI
Title
NFSD: Define a proc_layoutcommit for the FlexFiles layout type
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: Define a proc_layoutcommit for the FlexFiles layout type Avoid a crash if a pNFS client should happen to send a LAYOUTCOMMIT operation on a FlexFiles layout.
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
Linux Linux Affected: 9b9960a0ca4773e21c4b153ed355583946346b25 , < a75994dd879401c3e24ff51c2536559f1a53ea27 (git)
Affected: 9b9960a0ca4773e21c4b153ed355583946346b25 , < 34d187e020cbda112a6c6f094f0ca5e6a8672b75 (git)
Affected: 9b9960a0ca4773e21c4b153ed355583946346b25 , < ba88a53d7f5df4191583abf214214efe0cda91d2 (git)
Affected: 9b9960a0ca4773e21c4b153ed355583946346b25 , < da9129ef77786839a3ccd1d7afeeab790bceaa1d (git)
Affected: 9b9960a0ca4773e21c4b153ed355583946346b25 , < f7353208c91ab004e0179c5fb6c365b0f132f9f0 (git)
Affected: 9b9960a0ca4773e21c4b153ed355583946346b25 , < a156af6a4dc38c2aa7c98e89520a70fb3b3e7df4 (git)
Affected: 9b9960a0ca4773e21c4b153ed355583946346b25 , < 785ec512afa80d0540f2ca797c0e56de747a6083 (git)
Affected: 9b9960a0ca4773e21c4b153ed355583946346b25 , < 4b47a8601b71ad98833b447d465592d847b4dc77 (git)
Create a notification for this product.
Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.4.301 , ≤ 5.4.* (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.196 , ≤ 5.15.* (semver)
Unaffected: 6.1.158 , ≤ 6.1.* (semver)
Unaffected: 6.6.114 , ≤ 6.6.* (semver)
Unaffected: 6.12.55 , ≤ 6.12.* (semver)
Unaffected: 6.17.5 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/flexfilelayout.c"
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              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
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        }
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                  "versionEndExcluding": "5.4.301",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
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                {
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                  "versionEndExcluding": "5.10.246",
                  "versionStartIncluding": "4.8",
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                {
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                  "versionStartIncluding": "4.8",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.158",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.6.114",
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                }
              ],
              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Define a proc_layoutcommit for the FlexFiles layout type\n\nAvoid a crash if a pNFS client should happen to send a LAYOUTCOMMIT\noperation on a FlexFiles layout."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable code is in the in-kernel NFS server (nfsd), reached by processing an NFSv4.1 LAYOUTCOMMIT operation received in a COMPOUND RPC from a remote client over TCP port 2049. No local access to the server is required.\nAC:L - Triggering is fully deterministic \u2014 the attacker simply issues LAYOUTGET followed by LAYOUTCOMMIT with lc_layout_type=LAYOUT_FLEX_FILES, and the unconditional call through the NULL ops-\u003eproc_layoutcommit fires every time; there is no race, timing window, or memory-layout dependency.\nPR:N - With the default AUTH_SYS flavor nfsd performs no credential verification \u2014 the client asserts its own uid, and NFSD_MAY_OWNER_OVERRIDE in the fh_verify() check is satisfied by simply claiming the file owner\u0027s uid. Any host permitted to reach the export can drive the whole sequence without possessing credentials on the server.\nUI:N - The attacker performs the mount, session setup, LAYOUTGET and LAYOUTCOMMIT entirely on their own; no action by any user or administrator on the NFS server is needed once the export is online.\nS:U - The crash occurs in the nfsd kernel thread within the same security authority as the affected kernel; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is a call through a NULL function pointer, not a read of out-of-bounds or freed memory; no kernel data or pointer values are disclosed to the remote client.\nI:N - No memory is written and no control-flow hijack is achievable \u2014 the target address is 0, which cannot be mapped by a remote attacker, so no file or kernel data is modified.\nA:H - The NULL dereference produces a kernel oops that kills the nfsd service thread (full panic when panic_on_oops is set) and leaks the export/stateid references held by nfsd4_layoutcommit(), rendering the NFS server unavailable; it can be re-triggered at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:07:40.146Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/34d187e020cbda112a6c6f094f0ca5e6a8672b75"
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        {
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        },
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          "url": "https://git.kernel.org/stable/c/da9129ef77786839a3ccd1d7afeeab790bceaa1d"
        },
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/4b47a8601b71ad98833b447d465592d847b4dc77"
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      "title": "NFSD: Define a proc_layoutcommit for the FlexFiles layout type",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40087",
    "datePublished": "2025-10-30T09:47:56.675Z",
    "dateReserved": "2025-04-16T07:20:57.162Z",
    "dateUpdated": "2026-08-05T12:07:40.146Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2025-40087",
      "id": "msrc_CVE-2025-40087",
      "initial_release_date": "2025-10-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "NFSD: Define a proc_layoutcommit for the FlexFiles layout type",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40087.json",
      "version": "2"
    },
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layout.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nfsd/flexfilelayout.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9b9960a0ca4773e21c4b153ed355583946346b25\",\"lessThan\":\"a75994dd879401c3e24ff51c2536559f1a53ea27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9b9960a0ca4773e21c4b153ed355583946346b25\",\"lessThan\":\"34d187e020cbda112a6c6f094f0ca5e6a8672b75\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9b9960a0ca4773e21c4b153ed355583946346b25\",\"lessThan\":\"ba88a53d7f5df4191583abf214214efe0cda91d2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9b9960a0ca4773e21c4b153ed355583946346b25\",\"lessThan\":\"da9129ef77786839a3ccd1d7afeeab790bceaa1d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9b9960a0ca4773e21c4b153ed355583946346b25\",\"lessThan\":\"f7353208c91ab004e0179c5fb6c365b0f132f9f0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9b9960a0ca4773e21c4b153ed355583946346b25\",\"lessThan\":\"a156af6a4dc38c2aa7c98e89520a70fb3b3e7df4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9b9960a0ca4773e21c4b153ed355583946346b25\",\"lessThan\":\"785ec512afa80d0540f2ca797c0e56de747a6083\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9b9960a0ca4773e21c4b153ed355583946346b25\",\"lessThan\":\"4b47a8601b71ad98833b447d465592d847b4dc77\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/nfsd/flexfilelayout.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.301\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.246\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.196\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.158\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.114\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.55\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17.5\",\"lessThanOrEqual\":\"6.17.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/34d187e020cbda112a6c6f094f0ca5e6a8672b75\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4b47a8601b71ad98833b447d465592d847b4dc77\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/785ec512afa80d0540f2ca797c0e56de747a6083\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a156af6a4dc38c2aa7c98e89520a70fb3b3e7df4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a75994dd879401c3e24ff51c2536559f1a53ea27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ba88a53d7f5df4191583abf214214efe0cda91d2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/da9129ef77786839a3ccd1d7afeeab790bceaa1d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f7353208c91ab004e0179c5fb6c365b0f132f9f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:20:58+00:00",
      "cve": "CVE-2025-40087",
      "id": "CVE-2025-40087",
      "initial_release_date": "2025-10-30T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NFSD: Define a proc_layoutcommit for the FlexFiles layout type",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40087.json",
      "version": "3"
    }
  }
}



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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

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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.
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  • 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.