Vulnerability-Lookup

OESA-2026-2840 (CVE-2026-55392)

Vulnerability from osv_openeuler – Published: 2026-07-06 11:11 – Updated: 2026-08-06 11:11 – Source website

Summary

nilfs-utils security update

Details

Userspace utilities for creating and mounting NILFS v2 filesystems.

Security Fix(es):

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.(CVE-2026-55392)

Severity

5.5 (Medium)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-55392	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "nilfs-utils-2.2.7-7.oe2003sp4.aarch64.rpm",
          "nilfs-utils-debuginfo-2.2.7-7.oe2003sp4.aarch64.rpm",
          "nilfs-utils-debugsource-2.2.7-7.oe2003sp4.aarch64.rpm",
          "nilfs-utils-devel-2.2.7-7.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "nilfs-utils-help-2.2.7-7.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "nilfs-utils-2.2.7-7.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "nilfs-utils-2.2.7-7.oe2003sp4.x86_64.rpm",
          "nilfs-utils-debuginfo-2.2.7-7.oe2003sp4.x86_64.rpm",
          "nilfs-utils-debugsource-2.2.7-7.oe2003sp4.x86_64.rpm",
          "nilfs-utils-devel-2.2.7-7.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "nilfs-utils",
        "purl": "pkg:rpm/openEuler/nilfs-utils\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.7-7.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "Userspace utilities for creating and mounting NILFS v2 filesystems.\r\n\r\nSecurity Fix(es):\n\nNILFS 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.(CVE-2026-55392)",
  "id": "OESA-2026-2840",
  "modified": "2026-08-06T11:11:45Z",
  "published": "2026-07-06T11:11:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2840"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55392"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nilfs-utils security update",
  "upstream": [
    "CVE-2026-55392"
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-06-18 18:00 – Updated: 2026-07-14 21:33 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 · CISA-ADP (v2.0.3)

Decision recorded 2026-06-18 18:53 UTC

CWE

CWE-1284 - Improper Validation of Specified Quantity in Input

Assigner

VulnCheck mitre root Scorecard

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

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-55392",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-18T18:53:49.632075Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-18T18:58:04.938Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/nilfs-dev/nilfs-utils",
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              "versionType": "git"
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      "credits": [
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      "datePublic": "2026-06-10T00:00:00.000Z",
      "descriptions": [
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          "lang": "en",
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        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 6.7,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
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            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "valueDensity": "NOT_DEFINED",
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            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
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            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
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          "format": "CVSS",
          "scenarios": [
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      "providerMetadata": {
        "dateUpdated": "2026-07-14T21:33:59.224Z",
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      "references": [
        {
          "name": "Pull Request",
          "tags": [
            "issue-tracking"
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          "url": "https://github.com/nilfs-dev/nilfs-utils/issues/26"
        },
        {
          "name": "Patch Commit",
          "tags": [
            "patch"
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          "url": "https://github.com/nilfs-dev/nilfs-utils/commit/26efb5daff0757365101035145331b0a5a85d9d9"
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  "cveMetadata": {
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    "datePublished": "2026-06-18T18:00:12.736Z",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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OESA-2026-2840 (CVE-2026-55392)

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

Tags

Sightings

Nomenclature

Related by attack behaviour