GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2023-53381 (GCVE-0-2023-53381)

Vulnerability from cvelistv5 – Published: 2025-09-18 13:33 – Updated: 2026-08-05 09:13
VLAI
Title
NFSD: fix leaked reference count of nfsd4_ssc_umount_item
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: fix leaked reference count of nfsd4_ssc_umount_item The reference count of nfsd4_ssc_umount_item is not decremented on error conditions. This prevents the laundromat from unmounting the vfsmount of the source file. This patch decrements the reference count of nfsd4_ssc_umount_item on error.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:56 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a4bc287943f5695209ff36bdc89f17b48d68fae7 , < 2da50149981d05955e51c28e982e9ac29bd73417 (git)
Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < 80a15dc4a0214b55ca42675bb0bb2a8d857eb1d0 (git)
Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < 9f0df37520a27ad99eaacf38418b3d2bb5023105 (git)
Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < 6c3c05402547aaca3edb23327b50f01a881831b9 (git)
Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < 34e8f9ec4c9ac235f917747b23a200a5e0ec857b (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.154 , ≤ 5.15.* (semver)
Unaffected: 6.1.16 , ≤ 6.1.* (semver)
Unaffected: 6.2.3 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2023-53381",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-14T18:56:23.125939Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "description": "CWE-noinfo Not enough information",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-14T19:03:04.270Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4proc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2da50149981d05955e51c28e982e9ac29bd73417",
              "status": "affected",
              "version": "a4bc287943f5695209ff36bdc89f17b48d68fae7",
              "versionType": "git"
            },
            {
              "lessThan": "80a15dc4a0214b55ca42675bb0bb2a8d857eb1d0",
              "status": "affected",
              "version": "f4e44b393389c77958f7c58bf4415032b4cda15b",
              "versionType": "git"
            },
            {
              "lessThan": "9f0df37520a27ad99eaacf38418b3d2bb5023105",
              "status": "affected",
              "version": "f4e44b393389c77958f7c58bf4415032b4cda15b",
              "versionType": "git"
            },
            {
              "lessThan": "6c3c05402547aaca3edb23327b50f01a881831b9",
              "status": "affected",
              "version": "f4e44b393389c77958f7c58bf4415032b4cda15b",
              "versionType": "git"
            },
            {
              "lessThan": "34e8f9ec4c9ac235f917747b23a200a5e0ec857b",
              "status": "affected",
              "version": "f4e44b393389c77958f7c58bf4415032b4cda15b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4proc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.154",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.154",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.16",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.3",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: fix leaked reference count of nfsd4_ssc_umount_item\n\nThe reference count of nfsd4_ssc_umount_item is not decremented\non error conditions. This prevents the laundromat from unmounting\nthe vfsmount of the source file.\n\nThis patch decrements the reference count of nfsd4_ssc_umount_item\non error."
        }
      ],
      "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 flaw is in nfsd\u0027s NFSv4.2 OP_COPY handler (nfsd4_copy), reached by sending a COMPOUND over TCP/2049 to the in-kernel NFS server; no local access is required.\nAC:L - The attacker controls the trigger by issuing concurrent async inter-server COPY requests that exhaust kthread/memory resources so setup succeeds then out_err runs, yielding a deterministic per-failure nsui_refcnt leak with no race outside attacker control.\nPR:N - Under AUTH_SYS (default for typical NFS deployments) the server verifies no secret; EXCHANGE_ID/CREATE_SESSION/OPEN succeed for any host allowed by the export, so no server-verified privileges are required.\nUI:N - The attacker\u0027s own NFS client issues the COPY compounds directly; no administrator or other user action on the server is required.\nS:U - The leaked nfsd4_ssc_umount_item/vfsmount references remain within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - A reference-count leak neither reads out-of-bounds nor exposes kernel memory to the client; COPY replies are unchanged and no freed or uninitialized data is disclosed.\nI:N - No out-of-bounds write or object corruption occurs\u2014the nsui_refcnt merely stays elevated\u2014so there is no write primitive or control-flow hijack.\nA:H - Each failed async inter-COPY permanently pins the source vfsmount (and associated NFS client state) because the laundromat skips entries with refcnt\u003e1, and the leak is repeatable without bound by a remote client until kernel mounts/memory are exhausted."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:13:47.305Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2da50149981d05955e51c28e982e9ac29bd73417"
        },
        {
          "url": "https://git.kernel.org/stable/c/80a15dc4a0214b55ca42675bb0bb2a8d857eb1d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f0df37520a27ad99eaacf38418b3d2bb5023105"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c3c05402547aaca3edb23327b50f01a881831b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/34e8f9ec4c9ac235f917747b23a200a5e0ec857b"
        }
      ],
      "title": "NFSD: fix leaked reference count of nfsd4_ssc_umount_item",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53381",
    "datePublished": "2025-09-18T13:33:26.234Z",
    "dateReserved": "2025-09-17T14:54:09.736Z",
    "dateUpdated": "2026-08-05T09:13:47.305Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-53381",
      "date": "2026-09-17",
      "epss": "0.0028",
      "percentile": "0.20557"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53381\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-18T14:15:41.077\",\"lastModified\":\"2026-08-04T10:19:04.603\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nNFSD: fix leaked reference count of nfsd4_ssc_umount_item\\n\\nThe reference count of nfsd4_ssc_umount_item is not decremented\\non error conditions. This prevents the laundromat from unmounting\\nthe vfsmount of the source file.\\n\\nThis patch decrements the reference count of nfsd4_ssc_umount_item\\non error.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nfsd/nfs4proc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a4bc287943f5695209ff36bdc89f17b48d68fae7\",\"lessThan\":\"2da50149981d05955e51c28e982e9ac29bd73417\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f4e44b393389c77958f7c58bf4415032b4cda15b\",\"lessThan\":\"80a15dc4a0214b55ca42675bb0bb2a8d857eb1d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f4e44b393389c77958f7c58bf4415032b4cda15b\",\"lessThan\":\"9f0df37520a27ad99eaacf38418b3d2bb5023105\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f4e44b393389c77958f7c58bf4415032b4cda15b\",\"lessThan\":\"6c3c05402547aaca3edb23327b50f01a881831b9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f4e44b393389c77958f7c58bf4415032b4cda15b\",\"lessThan\":\"34e8f9ec4c9ac235f917747b23a200a5e0ec857b\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/nfsd/nfs4proc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.154\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.16\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2.3\",\"lessThanOrEqual\":\"6.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3\",\"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},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-01-14T18:56:23.125939Z\",\"id\":\"CVE-2023-53381\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-Other\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.14\",\"versionEndExcluding\":\"5.15.154\",\"matchCriteriaId\":\"0290B9D4-539A-4C65-88D4-3A68FBF7F40B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.16\",\"matchCriteriaId\":\"0FD95FDA-6525-4B13-B3FB-49D9995FD8ED\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.2.3\",\"matchCriteriaId\":\"88C67289-22AD-4CA9-B202-5F5A80E5BA4B\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2da50149981d05955e51c28e982e9ac29bd73417\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/34e8f9ec4c9ac235f917747b23a200a5e0ec857b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6c3c05402547aaca3edb23327b50f01a881831b9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/80a15dc4a0214b55ca42675bb0bb2a8d857eb1d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9f0df37520a27ad99eaacf38418b3d2bb5023105\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:22:03+00:00",
      "cve": "CVE-2023-53381",
      "id": "CVE-2023-53381",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "201",
      "product_status:known_affected": "36",
      "product_status:known_not_affected": "152",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NFSD: fix leaked reference count of nfsd4_ssc_umount_item",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53381.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T00:59:13Z",
      "cve": "CVE-2023-53381",
      "id": "CVE-2023-53381",
      "initial_release_date": "2025-09-18T23:38:29Z",
      "product_status:known_affected": "344",
      "product_status:known_not_affected": "395",
      "product_status:recommended": "233",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53381",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53381.json",
      "version": "22"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-53381\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-14T18:56:23.125939Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"description\": \"CWE-noinfo Not enough information\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T18:56:18.659Z\"}}], \"cna\": {\"title\": \"NFSD: fix leaked reference count of nfsd4_ssc_umount_item\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"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\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:N - The flaw is in nfsd\u0027s NFSv4.2 OP_COPY handler (nfsd4_copy), reached by sending a COMPOUND over TCP/2049 to the in-kernel NFS server; no local access is required.\\nAC:L - The attacker controls the trigger by issuing concurrent async inter-server COPY requests that exhaust kthread/memory resources so setup succeeds then out_err runs, yielding a deterministic per-failure nsui_refcnt leak with no race outside attacker control.\\nPR:N - Under AUTH_SYS (default for typical NFS deployments) the server verifies no secret; EXCHANGE_ID/CREATE_SESSION/OPEN succeed for any host allowed by the export, so no server-verified privileges are required.\\nUI:N - The attacker\u0027s own NFS client issues the COPY compounds directly; no administrator or other user action on the server is required.\\nS:U - The leaked nfsd4_ssc_umount_item/vfsmount references remain within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\\nC:N - A reference-count leak neither reads out-of-bounds nor exposes kernel memory to the client; COPY replies are unchanged and no freed or uninitialized data is disclosed.\\nI:N - No out-of-bounds write or object corruption occurs\\u2014the nsui_refcnt merely stays elevated\\u2014so there is no write primitive or control-flow hijack.\\nA:H - Each failed async inter-COPY permanently pins the source vfsmount (and associated NFS client state) because the laundromat skips entries with refcnt\u003e1, and the leak is repeatable without bound by a remote client until kernel mounts/memory are exhausted.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"a4bc287943f5695209ff36bdc89f17b48d68fae7\", \"lessThan\": \"2da50149981d05955e51c28e982e9ac29bd73417\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f4e44b393389c77958f7c58bf4415032b4cda15b\", \"lessThan\": \"80a15dc4a0214b55ca42675bb0bb2a8d857eb1d0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f4e44b393389c77958f7c58bf4415032b4cda15b\", \"lessThan\": \"9f0df37520a27ad99eaacf38418b3d2bb5023105\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f4e44b393389c77958f7c58bf4415032b4cda15b\", \"lessThan\": \"6c3c05402547aaca3edb23327b50f01a881831b9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f4e44b393389c77958f7c58bf4415032b4cda15b\", \"lessThan\": \"34e8f9ec4c9ac235f917747b23a200a5e0ec857b\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/nfsd/nfs4proc.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.14\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.14\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.154\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.2.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.2.*\"}, {\"status\": \"unaffected\", \"version\": \"6.3\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nfsd/nfs4proc.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/2da50149981d05955e51c28e982e9ac29bd73417\"}, {\"url\": \"https://git.kernel.org/stable/c/80a15dc4a0214b55ca42675bb0bb2a8d857eb1d0\"}, {\"url\": \"https://git.kernel.org/stable/c/9f0df37520a27ad99eaacf38418b3d2bb5023105\"}, {\"url\": \"https://git.kernel.org/stable/c/6c3c05402547aaca3edb23327b50f01a881831b9\"}, {\"url\": \"https://git.kernel.org/stable/c/34e8f9ec4c9ac235f917747b23a200a5e0ec857b\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nNFSD: fix leaked reference count of nfsd4_ssc_umount_item\\n\\nThe reference count of nfsd4_ssc_umount_item is not decremented\\non error conditions. This prevents the laundromat from unmounting\\nthe vfsmount of the source file.\\n\\nThis patch decrements the reference count of nfsd4_ssc_umount_item\\non error.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.154\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.16\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2.3\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.3\", \"versionStartIncluding\": \"5.14\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T09:13:47.305Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-53381\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T09:13:47.305Z\", \"dateReserved\": \"2025-09-17T14:54:09.736Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-18T13:33:26.234Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




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.