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CVE-2026-46256

Estado: AnalizadaMedia (5.5)—

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

NFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages

LOCALIO is an NFS loopback mount optimization that avoids using the network for READ, WRITE and COMMIT if the NFS client and server are determined to be on the same system. But because LOCALIO is still fundamentally "just NFS loopback mount" it is susceptible to recursion deadlock via direct reclaim, e.g.: NFS LOCALIO down to XFS and then back into NFS via nfs_writepages.

Fix LOCALIO's potential for direct reclaim deadlock by ensuring that all its page cache allocations are done from GFP_NOFS context.

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Thanks to Ben Coddington for pointing out commit ad22c7a043c2 ("xfs: prevent stack overflows from page cache allocation").

CVSS

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)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-46256",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "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": "70ba381e1a431245c137ed597ec6a05991c79bd9",
              "lessThan": "ae26a4cf2baf0a44c538dc093504d1994b02dade",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "70ba381e1a431245c137ed597ec6a05991c79bd9",
              "lessThan": "6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "70ba381e1a431245c137ed597ec6a05991c79bd9",
              "lessThan": "67435d2d8a33a75f9647724952cb1b18279d2e95",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/nfs/localio.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.12",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/nfs/localio.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-06-03T18:16:26.607",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/67435d2d8a33a75f9647724952cb1b18279d2e95",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9",
      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "url": "https://git.kernel.org/stable/c/ae26a4cf2baf0a44c538dc093504d1994b02dade",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages\n\nLOCALIO is an NFS loopback mount optimization that avoids using the\nnetwork for READ, WRITE and COMMIT if the NFS client and server are\ndetermined to be on the same system. But because LOCALIO is still\nfundamentally \"just NFS loopback mount\" it is susceptible to recursion\ndeadlock via direct reclaim, e.g.: NFS LOCALIO down to XFS and then\nback into NFS via nfs_writepages.\n\nFix LOCALIO's potential for direct reclaim deadlock by ensuring that\nall its page cache allocations are done from GFP_NOFS context.\n\nThanks to Ben Coddington for pointing out commit ad22c7a043c2 (\"xfs:\nprevent stack overflows from page cache allocation\")."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nNFS/localio: prevenir la recursión de recuperación directa en NFS a través de nfs_writepages\n\nLOCALIO es una optimización de montaje de bucle invertido de NFS que evita usar la red para LECTURA, ESCRITURA y COMMIT si se determina que el cliente y el servidor NFS están en el mismo sistema. Pero debido a que LOCALIO sigue siendo fundamentalmente 'solo montaje de bucle invertido de NFS', es susceptible a un interbloqueo por recursión a través de la recuperación directa, por ejemplo: NFS LOCALIO hasta XFS y luego de vuelta a NFS a través de nfs_writepages.\n\nSolucionar el potencial de LOCALIO para el interbloqueo por recuperación directa asegurando que todas sus asignaciones de caché de página se realicen desde el contexto GFP_NOFS.\n\nGracias a Ben Coddington por señalar el commit ad22c7a043c2 ('xfs: prevenir desbordamientos de pila por asignación de caché de página')."
    }
  ],
  "lastModified": "2026-07-22T20:10:00.127",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "93C3663E-7115-4246-81F5-164695082093",
              "versionEndExcluding": "6.18.14",
              "versionStartIncluding": "6.12"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "672A3E79-EC03-479D-8503-361DFBDC8092",
              "versionEndExcluding": "6.19.4",
              "versionStartIncluding": "6.19"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}