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CVE-2026-89673

Estado: RecibidaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo

nfsd4_ff_encode_getdeviceinfo() computes the da_addr_body reservation as 16 + netid_len + addr_len, but the subsequent xdr_encode_opaque() calls emit 8 + round_up(netid_len, 4) + round_up(addr_len, 4) bytes. The mismatch means the declared da_addr_body length exceeds the actual encoded data by 2-8 bytes on every flexfile GETDEVICEINFO reply, leaking stale reply-page content to the client and mis-aligning the subsequent version list decode.

Use xdr_align_size() for each string length to match what xdr_encode_opaque() actually writes.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-89673",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "efcae97fa425ca6db9d126e37daccf2d7225cb09",
              "lessThan": "88bce7e326c368d7df15126ccac537e54bebd467",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "efcae97fa425ca6db9d126e37daccf2d7225cb09",
              "lessThan": "74015b7be806ad9e21d46f7bd2831df280c6c783",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "efcae97fa425ca6db9d126e37daccf2d7225cb09",
              "lessThan": "41ebca28e17f84293650598f86bd69532ec1a8e0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "efcae97fa425ca6db9d126e37daccf2d7225cb09",
              "lessThan": "62e5949f0dd5ec837af144860ff908369df4c7c9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "efcae97fa425ca6db9d126e37daccf2d7225cb09",
              "lessThan": "8b989aaec85e1293a871d602590c951fe44b8647",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/nfsd/flexfilelayoutxdr.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4.16",
              "lessThan": "6.6.157",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.4.16",
              "lessThan": "6.12.109",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.4.16",
              "lessThan": "6.18.50",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.4.16",
              "lessThan": "7.2.4",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.4.16",
              "lessThan": "7.3-rc1",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "fs/nfsd/flexfilelayoutxdr.c"
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-09-11T20:19:53.890",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/41ebca28e17f84293650598f86bd69532ec1a8e0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/62e5949f0dd5ec837af144860ff908369df4c7c9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/74015b7be806ad9e21d46f7bd2831df280c6c783",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/88bce7e326c368d7df15126ccac537e54bebd467",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8b989aaec85e1293a871d602590c951fe44b8647",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix XDR padding calculation in ff_encode_getdeviceinfo\n\nnfsd4_ff_encode_getdeviceinfo() computes the da_addr_body reservation\nas 16 + netid_len + addr_len, but the subsequent xdr_encode_opaque()\ncalls emit 8 + round_up(netid_len, 4) + round_up(addr_len, 4) bytes.\nThe mismatch means the declared da_addr_body length exceeds the actual\nencoded data by 2-8 bytes on every flexfile GETDEVICEINFO reply,\nleaking stale reply-page content to the client and mis-aligning the\nsubsequent version list decode.\n\nUse xdr_align_size() for each string length to match what\nxdr_encode_opaque() actually writes."
    }
  ],
  "lastModified": "2026-09-14T13:19:19.333",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}