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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 CPE status
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)
guessed 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)
guessed Create a notification for this product.
Show details on NVD website
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          "product": "Linux",
          "programFiles": [
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          "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."
        }
      ],
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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",
            "version": "3.1"
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              "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."
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    "dateReserved": "2025-04-16T07:20:57.162Z",
    "dateUpdated": "2026-08-05T12:07:40.146Z",
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    "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:55:50Z",
      "cve": "CVE-2025-40087",
      "id": "CVE-2025-40087",
      "initial_release_date": "2025-10-31T00:25:20Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "690",
      "product_status:known_not_affected": "36",
      "product_status:recommended": "493",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40087",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40087.json",
      "version": "48"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • 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.


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