FKIE_CVE-2025-21691

Vulnerability from fkie_nvd - Published: 2025-02-10 16:15 - Updated: 2025-10-15 16:25
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: cachestat: fix page cache statistics permission checking When the 'cachestat()' system call was added in commit cf264e1329fb ("cachestat: implement cachestat syscall"), it was meant to be a much more convenient (and performant) version of mincore() that didn't need mapping things into the user virtual address space in order to work. But it ended up missing the "check for writability or ownership" fix for mincore(), done in commit 134fca9063ad ("mm/mincore.c: make mincore() more conservative"). This just adds equivalent logic to 'cachestat()', modified for the file context (rather than vma).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5f537664e705b0bf8b7e329861f20128534f6a83Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/780ab8329672464984cf1344bd5c3993af0226c7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d6405c13b0d8a8367cd8df63f118b619a3f0dd2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/97153a05077f618f7471f50a78158602badccb30Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.13
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "1FADAF68-4B9E-4DCE-9F38-C617F8FFCB85",
              "versionEndExcluding": "6.6.75",
              "versionStartIncluding": "6.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B04C243A-753B-49A9-87C7-92FCC1425FB7",
              "versionEndExcluding": "6.12.12",
              "versionStartIncluding": "6.7",
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            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.13:*:*:*:*:*:*:*",
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          "operator": "OR"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachestat: fix page cache statistics permission checking\n\nWhen the \u0027cachestat()\u0027 system call was added in commit cf264e1329fb\n(\"cachestat: implement cachestat syscall\"), it was meant to be a much\nmore convenient (and performant) version of mincore() that didn\u0027t need\nmapping things into the user virtual address space in order to work.\n\nBut it ended up missing the \"check for writability or ownership\" fix for\nmincore(), done in commit 134fca9063ad (\"mm/mincore.c: make mincore()\nmore conservative\").\n\nThis just adds equivalent logic to \u0027cachestat()\u0027, modified for the file\ncontext (rather than vma)."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cachestat: corregir la comprobaci\u00f3n de permisos de las estad\u00edsticas de cach\u00e9 de p\u00e1gina Cuando se a\u00f1adi\u00f3 la llamada al sistema \u0027cachestat()\u0027 en el commit cf264e1329fb (\"cachestat: implementar la llamada al sistema cachestat\"), se supon\u00eda que era una versi\u00f3n mucho m\u00e1s conveniente (y de mayor rendimiento) de mincore() que no necesitaba asignar cosas al espacio de direcciones virtuales del usuario para funcionar. Pero termin\u00f3 faltando la correcci\u00f3n de \"comprobar la capacidad de escritura o la propiedad\" para mincore(), realizada en el commit 134fca9063ad (\"mm/mincore.c: hacer que mincore() sea m\u00e1s conservador\"). Esto solo a\u00f1ade una l\u00f3gica equivalente a \u0027cachestat()\u0027, modificada para el contexto del archivo (en lugar de vma)."
    }
  ],
  "id": "CVE-2025-21691",
  "lastModified": "2025-10-15T16:25:09.187",
  "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": "2025-02-10T16:15:38.660",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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