CVE-2023-53680 (GCVE-0-2023-53680)

Vulnerability from cvelistv5 – Published: 2025-10-07 15:21 – Updated: 2026-10-15 21:41
VLAI
Title
NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL OPDESC() simply indexes into nfsd4_ops[] by the op's operation number, without range checking that value. It assumes callers are careful to avoid calling it with an out-of-bounds opnum value. nfsd4_decode_compound() is not so careful, and can invoke OPDESC() with opnum set to OP_ILLEGAL, which is 10044 -- well beyond the end of nfsd4_ops[].
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:36 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 , < 50827896c365e0f6c8b55ed56d444dafd87c92c5 (git)
Affected: f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 , < a64160124d5a078be0c380b1e8a0bad2d040d3a1 (git)
Affected: f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 , < ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e (git)
Affected: f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 , < f352c41fa718482979e7e6b71b4da2b718e381cc (git)
Affected: f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 , < 804d8e0a6e54427268790472781e03bc243f4ee3 (git)
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Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.10.220 , ≤ 5.10.* (semver)
Unaffected: 5.15.107 , ≤ 5.15.* (semver)
Unaffected: 6.1.24 , ≤ 6.1.* (semver)
Unaffected: 6.2.11 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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        "vulnStatus": "Modified",
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          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:16:39+00:00",
      "cve": "CVE-2023-53680",
      "id": "CVE-2023-53680",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "630",
      "product_status:known_affected": "170",
      "product_status:known_not_affected": "132",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NFSD: Avoid calling OPDESC() with ops-\u003eopnum == OP_ILLEGAL",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53680.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-16T13:22:19Z",
      "cve": "CVE-2023-53680",
      "id": "CVE-2023-53680",
      "initial_release_date": "2025-10-08T23:30:01Z",
      "product_status:known_affected": "423",
      "product_status:known_not_affected": "323",
      "product_status:recommended": "196",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53680",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2023-53680.json",
      "version": "24"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2023-53680",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-15T21:36:29.078436Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-15T21:36:29.907Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "fs/nfsd/nfs4xdr.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "50827896c365e0f6c8b55ed56d444dafd87c92c5",
                  "status": "affected",
                  "version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8",
                  "versionType": "git"
                },
                {
                  "lessThan": "a64160124d5a078be0c380b1e8a0bad2d040d3a1",
                  "status": "affected",
                  "version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8",
                  "versionType": "git"
                },
                {
                  "lessThan": "ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e",
                  "status": "affected",
                  "version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8",
                  "versionType": "git"
                },
                {
                  "lessThan": "f352c41fa718482979e7e6b71b4da2b718e381cc",
                  "status": "affected",
                  "version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8",
                  "versionType": "git"
                },
                {
                  "lessThan": "804d8e0a6e54427268790472781e03bc243f4ee3",
                  "status": "affected",
                  "version": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "fs/nfsd/nfs4xdr.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.14"
                },
                {
                  "lessThan": "4.14",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.220",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.107",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.24",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.2.*",
                  "status": "unaffected",
                  "version": "6.2.11",
                  "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": "5.10.220",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.107",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.24",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.2.11",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.3",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Avoid calling OPDESC() with ops-\u003eopnum == OP_ILLEGAL\n\nOPDESC() simply indexes into nfsd4_ops[] by the op\u0027s operation\nnumber, without range checking that value. It assumes callers are\ncareful to avoid calling it with an out-of-bounds opnum value.\n\nnfsd4_decode_compound() is not so careful, and can invoke OPDESC()\nwith opnum set to OP_ILLEGAL, which is 10044 -- well beyond the end\nof nfsd4_ops[]."
            }
          ],
          "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 defect is in nfsd\u0027s NFSv4 COMPOUND XDR decoder, driven directly by bytes a remote client sends to TCP/2049. Any host able to reach the NFS server can supply the malformed opnum.\nAC:L - Triggering requires only a single COMPOUND request carrying an opnum outside the legal range for the minorversion (e.g. 0, 1, 2, or anything above LAST_NFS42_OP); it is deterministic with no race, timing, or memory-layout dependency.\nPR:N - nfsd4_decode_compound() runs during RPC argument decode, before any export permission, filehandle, or NFSv4 state/authorization check in nfsd4_proc_compound(); with the default AUTH_SYS flavor no principal is authenticated, so an unauthenticated network peer reaches this code.\nUI:N - The attacker sends the malformed COMPOUND unilaterally; nothing is required of any local user or administrator on the server.\nS:U - The out-of-bounds pointer and any resulting fault stay within the kernel\u0027s own security authority on the NFS server, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:N - Nothing read from the out-of-bounds address is ever encoded into the NFS reply \u2014 the descriptor fields are only tested as flags or used as a call target \u2014 and the offset is a hardcoded constant the attacker cannot steer, so no information is disclosed to the attacker.\nI:N - The bug only forms and stores an out-of-bounds read pointer; no attacker-controlled data is written anywhere and no kernel memory is modified.\nA:H - The wild pointer points roughly 550 KB past a const array in nfsd\u0027s module mapping, and any dereference of it (e.g. the indirect call OPDESC(op)-\u003eop_rsize_bop() in nfsd4_max_reply(), which is protected only by an easily-missed open-coded OP_ILLEGAL check) faults in an nfsd kthread and takes the NFS service down. A remote unauthenticated attacker can repeat the request at will, so the availability impact is scored High."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T09:15:31.911Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/50827896c365e0f6c8b55ed56d444dafd87c92c5"
            },
            {
              "url": "https://git.kernel.org/stable/c/a64160124d5a078be0c380b1e8a0bad2d040d3a1"
            },
            {
              "url": "https://git.kernel.org/stable/c/ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e"
            },
            {
              "url": "https://git.kernel.org/stable/c/f352c41fa718482979e7e6b71b4da2b718e381cc"
            },
            {
              "url": "https://git.kernel.org/stable/c/804d8e0a6e54427268790472781e03bc243f4ee3"
            }
          ],
          "title": "NFSD: Avoid calling OPDESC() with ops-\u003eopnum == OP_ILLEGAL",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2023-53680",
        "datePublished": "2025-10-07T15:21:34.626Z",
        "dateReserved": "2025-10-07T15:16:59.664Z",
        "dateUpdated": "2026-10-15T21:41:33.489Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Vulnerability timeline

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