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CVE-2017-18257

Status: ModifiedMedium (5.5)—
Severity5.5Medium · CVSS 3.0
Exploitation probability0.38 %higher than 30% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

The __get_data_block function in fs/f2fs/data.c in the Linux kernel before 4.11 allows local users to cause a denial of service (integer overflow and loop) via crafted use of the open and fallocate system calls with an FS_IOC_FIEMAP ioctl.

CVSS

Base score
5.5
Version
3.0
Vector
CVSS:3.0/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
0.38 %
Percentile among all scored CVEs
30
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).

Affected technologies (2)

Debian — Debian LinuxLinux — Linux Kernel

CWEs

References

Show 10 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2017-18257",
  "cveTags": [],
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          "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
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          "integrityImpact": "NONE",
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          "attackComplexity": "LOW",
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  "published": "2018-04-04T17:29:01.520",
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
        }
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The __get_data_block function in fs/f2fs/data.c in the Linux kernel before 4.11 allows local users to cause a denial of service (integer overflow and loop) via crafted use of the open and fallocate system calls with an FS_IOC_FIEMAP ioctl."
    },
    {
      "lang": "es",
      "value": "La función __get_data_block en fs/f2fs/data.c en el kernel de Linux, en versiones anteriores a la 4.11, permite que usuarios locales provoquen una denegación de servicio (desbordamiento de enteros y bucle) mediante el uso manipulado de las llamadas del sistema open y fallocate con un ioctl FS_IOC_FIEMAP."
    }
  ],
  "lastModified": "2026-06-17T01:12:29.670",
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  "sourceIdentifier": "cve@mitre.org"
}