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CVE-2019-18885

Status: ModifiedMedium (5.5)—PoC
Severity5.5Medium · CVSS 3.1
Exploitation probability1.22 %higher than 68% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitAvailableProof of concept on GitHub (unverified)

fs/btrfs/volumes.c in the Linux kernel before 5.1 allows a btrfs_verify_dev_extents NULL pointer dereference via a crafted btrfs image because fs_devices->devices is mishandled within find_device, aka CID-09ba3bc9dd15.

CVSS

Base score
5.5
Version
3.1
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
1.22 %
Percentile among all scored CVEs
68
Score date
10/20/2026

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).

Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

Affected technologies (1)

Linux — Linux Kernel

CWEs

References

Show 24 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2019-18885",
  "cveTags": [],
  "metrics": {
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          "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
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          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
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    "cvssMetricV31": [
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
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          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
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  "affected": [
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    {
      "url": "http://packetstormsecurity.com/files/156185/Kernel-Live-Patch-Security-Notice-LSN-0062-1.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "weaknesses": [
    {
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "fs/btrfs/volumes.c in the Linux kernel before 5.1 allows a btrfs_verify_dev_extents NULL pointer dereference via a crafted btrfs image because fs_devices->devices is mishandled within find_device, aka CID-09ba3bc9dd15."
    },
    {
      "lang": "es",
      "value": "El archivo fs/btrfs/volumes.c en el kernel de Linux versiones anteriores a la versión  5.1, permite una desreferencia del puntero NULL de la función btrfs_verify_dev_extents por medio de una imagen btrfs especialmente diseñada porque fs_devices-)devices es manejada inapropiadamente dentro de find_device, también se conoce como CID-09ba3bc9dd15."
    }
  ],
  "lastModified": "2026-06-17T02:25:31.530",
  "configurations": [
    {
      "nodes": [
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          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "B5857A73-CFC4-477B-8E21-2EDC12FABFDE",
              "versionEndExcluding": "5.1"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}