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CVE-2025-21817

Estado: ModificadaMedia (5.5)—

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

block: mark GFP_NOIO around sysfs ->store()

sysfs ->store is called with queue freezed, meantime we have several ->store() callbacks(update_nr_requests, wbt, scheduler) to allocate memory with GFP_KERNEL which may run into direct reclaim code path, then potential deadlock can be caused.

Fix the issue by marking NOIO around sysfs ->store()

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-2025-21817",
  "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": "1645cd7fd42c236c952e9228badcac4fea1829ea",
              "lessThan": "a09280c39ea54080daf19cfaf4a3121a8d17d5cd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8985da5481562e96b95e94ed8e5cc9b6565eb82b",
              "lessThan": "2566ce907e5d5db8a039647208e029ce559baa31",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c99f66e4084a62a2cc401c4704a84328aeddc9ec",
              "lessThan": "7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "block/blk-sysfs.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12.96",
              "lessThan": "6.12.109",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.13.2",
              "lessThan": "6.13.3",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "block/blk-sysfs.c"
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2025-02-27T20:16:04.243",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2566ce907e5d5db8a039647208e029ce559baa31",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a09280c39ea54080daf19cfaf4a3121a8d17d5cd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "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\nblock: mark GFP_NOIO around sysfs ->store()\n\nsysfs ->store is called with queue freezed, meantime we have several\n->store() callbacks(update_nr_requests, wbt, scheduler) to allocate\nmemory with GFP_KERNEL which may run into direct reclaim code path,\nthen potential deadlock can be caused.\n\nFix the issue by marking NOIO around sysfs ->store()"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: block: mark GFP_NOIO around sysfs ->store() sysfs ->store se llama con la cola congelada, mientras tanto tenemos varias devoluciones de llamadas ->store() (update_nr_requests, wbt, scheduler) para asignar memoria con GFP_KERNEL que puede ejecutarse en una ruta de código de recuperación directa, lo que puede provocar un posible bloqueo. Solucione el problema marcando NOIO alrededor de sysfs ->store()"
    }
  ],
  "lastModified": "2026-09-07T16:17:27.213",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.13.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "87D43B7A-D234-4A8A-9769-AAC59CA2B99D"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}