CVE-2025-40099

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: parse_dfs_referrals: prevent oob on malformed input Malicious SMB server can send invalid reply to FSCTL_DFS_GET_REFERRALS - reply smaller than sizeof(struct get_dfs_referral_rsp) - reply with number of referrals smaller than NumberOfReferrals in the header Processing of such replies will cause oob. Return -EINVAL error on such replies to prevent oob-s.

Severity

CRITICAL

CVSS score

9.4 (v3.1)

Vulnerability status

Deferred

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2025-10-30 10:15:34.337000

Last modified

2026-10-19 21:10:00.160000

View original CVE JSON

{
  "id": "CVE-2025-40099",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-10-30T10:15:34.337",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: parse_dfs_referrals: prevent oob on malformed input\n\nMalicious SMB server can send invalid reply to FSCTL_DFS_GET_REFERRALS\n\n- reply smaller than sizeof(struct get_dfs_referral_rsp)\n- reply with number of referrals smaller than NumberOfReferrals in the\nheader\n\nProcessing of such replies will cause oob.\n\nReturn -EINVAL error on such replies to prevent oob-s."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncifs: parse_dfs_referrals: prevenir oob en entrada malformada\n\nServidor SMB malicioso puede enviar respuesta inválida a FSCTL_DFS_GET_REFERRALS\n\n- respuesta más pequeña que sizeof(struct get_dfs_referral_rsp)\n- respuesta con número de referencias más pequeño que NumberOfReferrals en la\ncabecera\n\nEl procesamiento de tales respuestas causará oob.\n\nDevolver error -EINVAL en tales respuestas para prevenir oob-s."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "fs/smb/client/misc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
              "lessThan": "cfacc7441f760e4a73cc71b6ff1635261d534657",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
              "lessThan": "15c73964da9df994302f579ed14ee5fdbce7a332",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
              "lessThan": "8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
              "lessThan": "bb0f2e66e1ac043a5b238f5bcab4f26f3c317039",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
              "lessThan": "6447b0e355562a1ff748c4a2ffb89aae7e84d2c9",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "fs/smb/client/misc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "4.11",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "4.11",
              "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:H/I:L/A:H",
          "baseScore": 9.4,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.5
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-15T21:56:50.620033Z",
          "id": "CVE-2025-40099",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/15c73964da9df994302f579ed14ee5fdbce7a332",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6447b0e355562a1ff748c4a2ffb89aae7e84d2c9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bb0f2e66e1ac043a5b238f5bcab4f26f3c317039",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cfacc7441f760e4a73cc71b6ff1635261d534657",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}