md/raid1: create serial pool adding rdev to array with serialize_policy=1

{
  "id": "40e21e94ee64e6085e47aff8d5cd460759a84c63347f60a902294b4af8b38be8",
  "url": "https://osv.dev/vulnerability/CVE-2026-90385",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "md/raid1: create serial pool adding rdev to array with serialize_policy=1",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: md/raid1: create serial pool adding rdev to array with serialize_policy=1 The following bug has been observed with kernel 7.1.3 after adding a new rdev to an existing RAID1 array with serialize_policy enabled: Oops: 0002 [#1] CPU: 0 UID: 0 PID: 19639 Comm: ext4lazyinit Not tainted 7.1.3-1-default RIP: _raw_spin_lock_irqsave+0x27/0x50 CR2: 0000000000004960 Call Trace: wait_for_serialization+0xb9/0x260 [raid1] raid1_make_request+0x762/0xaff [raid1] md_handle_request+0x1c9/0x2e0 [md_mod] The raid1.c code calls wait_for_serialization() if the MD_SERIALIZE_POLICY is set, and wait_for_serialization assumes that rdev->serial is initialized. Normally this will be the case for arrays that have the serialize_policy sysfs attribute set to 1. But when a new rdev is added to an existing array in bind_rdev_to_array(), the condition at mddev_create_serial_pool() causes creation of rdev->serial to be skipped. Fix it.",
    "evidence": "osv:CVE-2026-90385",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.191",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-90385",
      "aliases": [
        "CVE-2026-90385"
      ],
      "affected": [
        {
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                  "fixed": "0b187e14dab458d54425fc400f1e1e8d481d9bcf"
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                  "fixed": "f9e4364449f7ca6917f3599eb32064dba5b7b147"
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                {
                  "fixed": "37f11973c3eb72a5eb061082cad529bb6939c24f"
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                {
                  "fixed": "c02d675e81468003e4f2253b616c53729070d712"
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                {
                  "fixed": "140234b2380ffb8ffb0cfc46fee0e822f43adef7"
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          ],
          "database_specific": {
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        {
          "ranges": [
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              "type": "ECOSYSTEM",
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                  "introduced": "5.6.0"
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                  "introduced": "6.7.0"
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            {
              "type": "ECOSYSTEM",
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                  "introduced": "6.19.0"
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                {
                  "fixed": "7.2.6"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90385.json"
          }
        }
      ],
      "modified": "2026-11-01T02:30:16.425610541Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0b187e14dab458d54425fc400f1e1e8d481d9bcf",
        "https://git.kernel.org/stable/c/140234b2380ffb8ffb0cfc46fee0e822f43adef7",
        "https://git.kernel.org/stable/c/37f11973c3eb72a5eb061082cad529bb6939c24f",
        "https://git.kernel.org/stable/c/6ea458171bed2b706dc7bcd80b15356c0e9ed718",
        "https://git.kernel.org/stable/c/c02d675e81468003e4f2253b616c53729070d712",
        "https://git.kernel.org/stable/c/f9e4364449f7ca6917f3599eb32064dba5b7b147",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90385.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90385",
        "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/2026/90xxx/CVE-2026-90385.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90385",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 504396,
  "published_at": "2026-09-17T16:09:21.198+00:00"
}