Vulnerability-Lookup

GHSA-F559-VGH2-9HJ6

Vulnerability from github – Published: 2026-06-18 21:32 – Updated: 2026-06-18 21:32

Details

NILFS utilities through 2.3.0, fixed in commit 26efb5d, nilfs_sb_is_valid() function fails to validate s_log_block_size field in NILFS2 superblock before bit-shift operations. Attackers supplying crafted NILFS2 images trigger undefined behavior through oversized shifts or out-of-memory conditions, crashing tools like nilfs-tune and dumpseg.

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

6.7 (Medium)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-55392"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1284"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-18T19:16:23Z",
    "severity": "MODERATE"
  },
  "details": "NILFS utilities through 2.3.0, fixed in commit 26efb5d, nilfs_sb_is_valid() function fails to validate s_log_block_size field in NILFS2 superblock before bit-shift operations. Attackers supplying crafted NILFS2 images trigger undefined behavior through oversized shifts or out-of-memory conditions, crashing tools like nilfs-tune and dumpseg.",
  "id": "GHSA-f559-vgh2-9hj6",
  "modified": "2026-06-18T21:32:34Z",
  "published": "2026-06-18T21:32:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55392"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nilfs-dev/nilfs-utils/issues/26"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nilfs-dev/nilfs-utils/commit/26efb5daff0757365101035145331b0a5a85d9d9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-55392 (GCVE-0-2026-55392)

Vulnerability from cvelistv5 – Published: 2026-06-18 18:00 – Updated: 2026-06-18 18:58 X_Open Source

Title

NILFS utilities - Undefined Behavior and Out-of-Memory via Unvalidated s_log_block_size

Summary

Severity

6.7 (Medium)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-1284 - Improper Validation of Specified Quantity in Input

Assigner

VulnCheck

References

2 references

URL	Tags
https://github.com/nilfs-dev/nilfs-utils/issues/26	issue-tracking
https://github.com/nilfs-dev/nilfs-utils/commit/2…	patch

Impacted products

1 product

Vendor	Product	Version
nilfs-dev	nilfs-utils	Affected: 0 , ≤ 2.3.0 (semver) Unaffected: 26efb5daff0757365101035145331b0a5a85d9d9 (git)

Date Public

2026-06-10 00:00

Credits

Tristan Madani (@TristanInSec)

Show details on NVD website

JSON

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  "containers": {
    "adp": [
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        "metrics": [
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                "id": "CVE-2026-55392",
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                    "Exploitation": "none"
                  },
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                  },
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                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-18T18:53:49.632075Z",
                "version": "2.0.3"
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        }
      ],
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-F559-VGH2-9HJ6

CVE-2026-55392 (GCVE-0-2026-55392)

Tags

Sightings

Nomenclature