FKIE_CVE-2025-71295

Vulnerability from fkie_nvd - Published: 2026-05-06 12:16 - Updated: 2026-10-14 13:10
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/buffer: add alert in try_to_free_buffers() for folios without buffers try_to_free_buffers() can be called on folios with no buffers attached when filemap_release_folio() is invoked on a folio belonging to a mapping with AS_RELEASE_ALWAYS set but no release_folio operation defined. In such cases, folio_needs_release() returns true because of the AS_RELEASE_ALWAYS flag, but the folio has no private buffer data. This causes try_to_free_buffers() to call drop_buffers() on a folio with no buffers, leading to a null pointer dereference. Adding a check in try_to_free_buffers() to return early if the folio has no buffers attached, with WARN_ON_ONCE() to alert about the misconfiguration. This provides defensive hardening.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1b111a69a6e33a922622bf9870e4e63fb2b649c8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/42c32d7571ccd8ef32351cac506f00b0fae99fd2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/727e5140e0cf83b4ce6a11b89bb73bff5d96f8f3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b68f91ef3b3fe82ad78c417de71b675699a8467cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c1b6227555c52781178132b7a06466711855795cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c6246ca15999053d2632fbcc7b86e6eef7f077cbPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/buffer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1b111a69a6e33a922622bf9870e4e63fb2b649c8",
              "status": "affected",
              "version": "d0eafc763135508be118dac208887a26c0adb74d",
              "versionType": "git"
            },
            {
              "lessThan": "c1b6227555c52781178132b7a06466711855795c",
              "status": "affected",
              "version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376",
              "versionType": "git"
            },
            {
              "lessThan": "727e5140e0cf83b4ce6a11b89bb73bff5d96f8f3",
              "status": "affected",
              "version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376",
              "versionType": "git"
            },
            {
              "lessThan": "42c32d7571ccd8ef32351cac506f00b0fae99fd2",
              "status": "affected",
              "version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376",
              "versionType": "git"
            },
            {
              "lessThan": "c6246ca15999053d2632fbcc7b86e6eef7f077cb",
              "status": "affected",
              "version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376",
              "versionType": "git"
            },
            {
              "lessThan": "b68f91ef3b3fe82ad78c417de71b675699a8467c",
              "status": "affected",
              "version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376",
              "versionType": "git"
            },
            {
              "lessThan": "6.1.165",
              "status": "affected",
              "version": "6.1.72",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/buffer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F9C931B5-ABFF-44E0-8DB4-F03D0583BE81",
              "versionEndExcluding": "6.1.165",
              "versionStartIncluding": "6.1.72",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "851E9353-6C09-4CC9-877E-E09DB164A3C2",
              "versionEndExcluding": "6.6.128",
              "versionStartIncluding": "6.2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2",
              "versionEndExcluding": "6.12.75",
              "versionStartIncluding": "6.7",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B",
              "versionEndExcluding": "6.18.16",
              "versionStartIncluding": "6.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67",
              "versionEndExcluding": "6.19.6",
              "versionStartIncluding": "6.19",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/buffer: add alert in try_to_free_buffers() for folios without buffers\n\ntry_to_free_buffers() can be called on folios with no buffers attached\nwhen filemap_release_folio() is invoked on a folio belonging to a mapping\nwith AS_RELEASE_ALWAYS set but no release_folio operation defined.\n\nIn such cases, folio_needs_release() returns true because of the\nAS_RELEASE_ALWAYS flag, but the folio has no private buffer data. This\ncauses try_to_free_buffers() to call drop_buffers() on a folio with no\nbuffers, leading to a null pointer dereference.\n\nAdding a check in try_to_free_buffers() to return early if the folio has no\nbuffers attached, with WARN_ON_ONCE() to alert about the misconfiguration.\nThis provides defensive hardening."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs/buffer: a\u00f1adir alerta en try_to_free_buffers() para folios sin b\u00faferes\n\ntry_to_free_buffers() puede ser llamada en folios sin b\u00faferes adjuntos cuando filemap_release_folio() es invocada en un folio perteneciente a un mapeo con AS_RELEASE_ALWAYS establecido pero sin operaci\u00f3n release_folio definida.\n\nEn tales casos, folio_needs_release() devuelve verdadero debido a la bandera AS_RELEASE_ALWAYS, pero el folio no tiene datos de b\u00fafer privados. Esto causa que try_to_free_buffers() llame a drop_buffers() en un folio sin b\u00faferes, lo que lleva a una desreferencia de puntero nulo.\n\nA\u00f1adiendo una comprobaci\u00f3n en try_to_free_buffers() para retornar anticipadamente si el folio no tiene b\u00faferes adjuntos, con WARN_ON_ONCE() para alertar sobre la mala configuraci\u00f3n. Esto proporciona un endurecimiento defensivo."
    }
  ],
  "id": "CVE-2025-71295",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-05-06T12:16:28.820",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/1b111a69a6e33a922622bf9870e4e63fb2b649c8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/42c32d7571ccd8ef32351cac506f00b0fae99fd2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/727e5140e0cf83b4ce6a11b89bb73bff5d96f8f3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/b68f91ef3b3fe82ad78c417de71b675699a8467c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c1b6227555c52781178132b7a06466711855795c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c6246ca15999053d2632fbcc7b86e6eef7f077cb"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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