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CVE-2026-46045

Status: AnalyzedHigh (7.8)—

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

md/md-llbitmap: skip reading rdevs that are not in_sync

When reading bitmap pages from member disks, the code iterates through all rdevs and attempts to read from the first available one. However, it only checks for raid_disk assignment and Faulty flag, missing the In_sync flag check.

This can cause bitmap data to be read from spare disks that are still being rebuilt and don't have valid bitmap information yet. Reading stale or uninitialized bitmap data from such disks can lead to incorrect dirty bit tracking, potentially causing data corruption during recovery or normal operation.

Read full descriptionShow less

Add the In_sync flag check to ensure bitmap pages are only read from fully synchronized member disks that have valid bitmap data.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Vulnerabilidad local (AV:L/PR:L) en kernel Linux que permite escalada de privilegios mediante corrupción de datos de bitmap RAID; afecta integridad y disponibilidad del sistema.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageFilter Network TrafficExecution PreventionEncrypt Sensitive Information

Affected technologies (1)

Linux — Linux Kernel

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-46045",
  "cveTags": [],
  "metrics": {
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        "source": "nvd@nist.gov",
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          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
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        "exploitabilityScore": 1.8
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  "published": "2026-05-27T14:17:23.953",
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  "weaknesses": [
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      "source": "nvd@nist.gov",
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          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/md-llbitmap: skip reading rdevs that are not in_sync\n\nWhen reading bitmap pages from member disks, the code iterates through\nall rdevs and attempts to read from the first available one. However,\nit only checks for raid_disk assignment and Faulty flag, missing the\nIn_sync flag check.\n\nThis can cause bitmap data to be read from spare disks that are still\nbeing rebuilt and don't have valid bitmap information yet. Reading\nstale or uninitialized bitmap data from such disks can lead to\nincorrect dirty bit tracking, potentially causing data corruption\nduring recovery or normal operation.\n\nAdd the In_sync flag check to ensure bitmap pages are only read from\nfully synchronized member disks that have valid bitmap data."
    }
  ],
  "lastModified": "2026-06-17T10:52:57.453",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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          "operator": "OR"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}