CVE-2026-74316 (GCVE-0-2026-74316)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:45
VLAI
Title
NFSD: Handle layout stid in nfsd4_drop_revoked_stid()
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: Handle layout stid in nfsd4_drop_revoked_stid() nfsd4_drop_revoked_stid() has no SC_TYPE_LAYOUT case, so when a client sends FREE_STATEID for an admin-revoked layout stid, the default branch releases cl_lock and returns without unhashing or releasing the stid. The stid remains in the IDR and on the per-client list until the client is destroyed. Remove the layout stid from the per-client list and call nfs4_put_stid() to drop the creation reference. When the refcount reaches zero, nfsd4_free_layout_stateid() handles the remaining cleanup: cancelling the fence worker, removing from the per-file list, and freeing the slab object.
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: 1e33e1414bec54a4feafa9e67e2617031be0afe2 , < 7ed62f7040ee182cf7dea5798f9e114235b31dae (git)
Affected: 1e33e1414bec54a4feafa9e67e2617031be0afe2 , < da6f86ff4f2dd490bea52419a49e19680efd5847 (git)
Affected: 1e33e1414bec54a4feafa9e67e2617031be0afe2 , < 8024028ef91616cf91cc669f2446a0406bc0ba19 (git)
Affected: 1e33e1414bec54a4feafa9e67e2617031be0afe2 , < 86b9898920a6d02b4149f4fef9efd77b8aa3b9ca (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4state.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.9"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "6.9",
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                },
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Handle layout stid in nfsd4_drop_revoked_stid()\n\nnfsd4_drop_revoked_stid() has no SC_TYPE_LAYOUT case, so when a\nclient sends FREE_STATEID for an admin-revoked layout stid, the\ndefault branch releases cl_lock and returns without unhashing or\nreleasing the stid.  The stid remains in the IDR and on the\nper-client list until the client is destroyed.\n\nRemove the layout stid from the per-client list and call\nnfs4_put_stid() to drop the creation reference.  When the\nrefcount reaches zero, nfsd4_free_layout_stateid() handles the\nremaining cleanup: cancelling the fence worker, removing from\nthe per-file list, and freeing the slab object."
        }
      ],
      "metrics": [
        {
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            "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 flaw is reached through nfsd\u0027s NFSv4 OP_FREE_STATEID handler, processing attacker-controlled RPC compounds over the network on TCP port 2049 via nfsd_dispatch to nfsd4_proc_compound to nfsd4_free_stateid.\nAC:L - Once a client holds admin-revoked pNFS layout stateids, sending FREE_STATEID reliably triggers the leak every time; the attacker controls layout acquisition and the freeing RPC on both sides of the interaction.\nPR:N - Exploitation requires only remote NFSv4 client access to a pNFS-enabled export (EXCHANGE_ID/CREATE_SESSION plus FREE_STATEID), not local shell access or elevated privileges on the Linux host.\nUI:N - No administrator or end-user action on the server is required beyond normal NFS service exposure; the leak is triggered entirely by malicious NFS protocol traffic from a network client.\nS:U - Impact is confined to kernel memory and nfsd state management within the same kernel security boundary; there is no VM escape, container breakout, or cross-authority boundary crossing.\nC:N - The bug retains unreleased layout stateid structures in the IDR and per-client lists without corrupting memory or exposing kernel data; there is no out-of-bounds read or information disclosure primitive.\nI:N - No data modification or memory corruption occurs; the stateid is simply not freed when it should be, leaving stale entries without enabling arbitrary writes or code execution.\nA:H - Each triggered FREE_STATEID permanently leaks a layout stateid slab object and IDR slot until client teardown; a remote NFS client can repeat this for every admin-revoked pNFS layout, causing unbounded kernel memory consumption and nfsd DoS."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:45:50.196Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7ed62f7040ee182cf7dea5798f9e114235b31dae"
        },
        {
          "url": "https://git.kernel.org/stable/c/da6f86ff4f2dd490bea52419a49e19680efd5847"
        },
        {
          "url": "https://git.kernel.org/stable/c/8024028ef91616cf91cc669f2446a0406bc0ba19"
        },
        {
          "url": "https://git.kernel.org/stable/c/86b9898920a6d02b4149f4fef9efd77b8aa3b9ca"
        }
      ],
      "title": "NFSD: Handle layout stid in nfsd4_drop_revoked_stid()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74316",
    "datePublished": "2026-08-15T05:58:14.165Z",
    "dateReserved": "2026-08-15T05:44:03.883Z",
    "dateUpdated": "2026-08-17T05:45:50.196Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-20",
      "epss": "0.00441",
      "percentile": "0.37706"
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                "product": "Linux",
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              },
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                "vendor": "Linux",
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                    "versionType": "semver"
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                    "versionType": "semver"
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                    "versionType": "semver"
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        ],
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Handle layout stid in nfsd4_drop_revoked_stid()\n\nnfsd4_drop_revoked_stid() has no SC_TYPE_LAYOUT case, so when a\nclient sends FREE_STATEID for an admin-revoked layout stid, the\ndefault branch releases cl_lock and returns without unhashing or\nreleasing the stid.  The stid remains in the IDR and on the\nper-client list until the client is destroyed.\n\nRemove the layout stid from the per-client list and call\nnfs4_put_stid() to drop the creation reference.  When the\nrefcount reaches zero, nfsd4_free_layout_stateid() handles the\nremaining cleanup: cancelling the fence worker, removing from\nthe per-file list, and freeing the slab object."
          }
        ],
        "id": "CVE-2026-74316",
        "lastModified": "2026-08-17T06:19:25.973",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-08-15T06:22:31.890",
        "references": [
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            "url": "https://git.kernel.org/stable/c/7ed62f7040ee182cf7dea5798f9e114235b31dae"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T17:18:40+00:00",
      "cve": "CVE-2026-74316",
      "id": "CVE-2026-74316",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NFSD: Handle layout stid in nfsd4_drop_revoked_stid()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74316.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:23:00Z",
      "cve": "CVE-2026-74316",
      "id": "CVE-2026-74316",
      "initial_release_date": "2026-08-27T00:22:41Z",
      "product_status:known_affected": "29",
      "product_status:known_not_affected": "333",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74316",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74316.json",
      "version": "4"
    }
  }
}



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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.
  • 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.


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