md: avoid repeated calls to del_gendisk

{
  "id": "ef323005d843b3512d25804b5fbd3507fb3496a16dc6e219c83def2107590d2e",
  "url": "https://osv.dev/vulnerability/CVE-2025-68373",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "md: avoid repeated calls to del_gendisk",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: md: avoid repeated calls to del_gendisk There is a uaf problem which is found by case 23rdev-lifetime: Oops: general protection fault, probably for non-canonical address 0xdead000000000122 RIP: 0010:bdi_unregister+0x4b/0x170 Call Trace: __del_gendisk+0x356/0x3e0 mddev_unlock+0x351/0x360 rdev_attr_store+0x217/0x280 kernfs_fop_write_iter+0x14a/0x210 vfs_write+0x29e/0x550 ksys_write+0x74/0xf0 do_syscall_64+0xbb/0x380 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff5250a177e The sequence is: 1. rdev remove path gets reconfig_mutex 2. rdev remove path release reconfig_mutex in mddev_unlock 3. md stop calls do_md_stop and sets MD_DELETED 4. rdev remove path calls del_gendisk because MD_DELETED is set 5. md stop path release reconfig_mutex and calls del_gendisk again So there is a race condition we should resolve. This patch adds a flag MD_DO_DELETE to avoid the race condition.",
    "evidence": "osv:CVE-2025-68373",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.17.13",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-68373",
      "aliases": [
        "CVE-2025-68373"
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "f0fae1debeb9102398ddf2ef69b4f5d395afafed"
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                  "fixed": "90e3bb44c0a86e245d8e5c6520206fa113acb1ee"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68373.json"
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        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.17.0"
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                {
                  "fixed": "6.17.13"
                }
              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.18.0"
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                {
                  "fixed": "6.18.2"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68373.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.226623078Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/90e3bb44c0a86e245d8e5c6520206fa113acb1ee",
        "https://git.kernel.org/stable/c/b4c5cf406062ad44cd178269571530c6435b2f3b",
        "https://git.kernel.org/stable/c/f0fae1debeb9102398ddf2ef69b4f5d395afafed",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68373.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-68373",
        "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/2025/68xxx/CVE-2025-68373.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-68373",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 498815,
  "published_at": "2025-12-24T10:33:03.375+00:00"
}