NILFS utilities – Undefined Behavior and Out-of-Memory via Unvalidated s_log_block_size_CVE-2026-55392

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-06-18T18:00:12.736Z",
    "modified": "2026-06-18T18:58:04.938Z",
    "type": "cve",
    "title": "NILFS utilities - Undefined Behavior and Out-of-Memory via Unvalidated s_log_block_size",
    "source": "VulnCheck",
    "references": "https://github.com/nilfs-dev/nilfs-utils/issues/26\nhttps://github.com/nilfs-dev/nilfs-utils/commit/26efb5daff0757365101035145331b0a5a85d9d9",
    "id": "CVE-2026-55392",
    "bulletinFamily": "",
    "cwe": [
        "CWE-1284"
    ],
    "cvelist": null,
    "sourceData": "nilfs-dev nilfs-utils 0",
    "sourceHref": "",
    "cvss": {
        "score": 6.7,
        "severity": "MEDIUM",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "nilfs-utils",
    "version": "0",
    "vendor": "nilfs-dev",
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}