md/md-llbitmap: fix percpu_ref not resurrected on suspend timeout

{
  "id": "97fdc91e250d04adc2a2026c778d0300bfdd0d316d2689006a7e85e69f5fe4b6",
  "url": "https://osv.dev/vulnerability/CVE-2026-45955",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "md/md-llbitmap: fix percpu_ref not resurrected on suspend timeout",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: md/md-llbitmap: fix percpu_ref not resurrected on suspend timeout When llbitmap_suspend_timeout() times out waiting for percpu_ref to become zero, it returns -ETIMEDOUT without resurrecting the percpu_ref. The caller (md_llbitmap_daemon_fn) then continues to the next page without calling llbitmap_resume(), leaving the percpu_ref in a killed state permanently. Fix this by resurrecting the percpu_ref before returning the error, ensuring the page control structure remains usable for subsequent operations.",
    "evidence": "osv:CVE-2026-45955",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.14",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-45955",
      "aliases": [
        "CVE-2026-45955"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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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": "095417d6b669c2dec39a5842ccb94df915f97f54"
                },
                {
                  "fixed": "2446d099350185caeed19ab2c0270451a97296fb"
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                {
                  "fixed": "d119bd2e1643cc023210ff3c6f0657e4f914e71d"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45955.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.18.0"
                },
                {
                  "fixed": "6.18.14"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45955.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.666865500Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/095417d6b669c2dec39a5842ccb94df915f97f54",
        "https://git.kernel.org/stable/c/2446d099350185caeed19ab2c0270451a97296fb",
        "https://git.kernel.org/stable/c/d119bd2e1643cc023210ff3c6f0657e4f914e71d",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45955.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-45955",
        "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/2026/45xxx/CVE-2026-45955.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-45955",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494441,
  "published_at": "2026-05-27T12:18:10.951+00:00"
}