block: mark GFP_NOIO around sysfs ->store()

{
  "id": "110ef7cb3dec5199c251535f8b91bd53176c3ce427c9ba51de2529cba54d0f79",
  "url": "https://osv.dev/vulnerability/CVE-2025-21817",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "block: mark GFP_NOIO around sysfs ->store()",
    "summary": "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()",
    "evidence": "osv:CVE-2025-21817",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.12.109",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.13.3",
            "evidence": "/affected/1/ranges"
          }
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        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-21817",
      "aliases": [
        "CVE-2025-21817"
      ],
      "affected": [
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          "database_specific": {
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        {
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              "type": "ECOSYSTEM",
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          "package": {
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            "ecosystem": "Linux"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21817.json"
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      ],
      "modified": "2026-10-28T02:30:38.335752278Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2566ce907e5d5db8a039647208e029ce559baa31",
        "https://git.kernel.org/stable/c/7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c",
        "https://git.kernel.org/stable/c/a09280c39ea54080daf19cfaf4a3121a8d17d5cd",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21817.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-21817",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21817.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-21817",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 505512,
  "published_at": "2025-02-27T20:04:15.988+00:00"
}