CVE-2026-55392

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{"bugzilla": {"description": "nilfs-utils: NILFS utilities: Denial of Service via crafted NILFS2 images", "id": "2490544", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2490544"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1284", "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.", "A flaw was found in NILFS utilities. An attacker can exploit this vulnerability by supplying a crafted NILFS2 image. This can lead to undefined behavior, oversized shifts, or out-of-memory conditions, ultimately causing a Denial of Service (DoS) by crashing tools such as nilfs-tune and dumpseg."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, avoid processing NILFS2 images from untrusted sources. Restrict the use of NILFS utilities, such as `nilfs-tune` and `dumpseg`, to trusted administrators and environments. This reduces the exposure to specially crafted malicious NILFS2 images."}, "name": "CVE-2026-55392", "public_date": "2026-06-18T18:00:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-55392\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-55392\nhttps://github.com/nilfs-dev/nilfs-utils/commit/26efb5daff0757365101035145331b0a5a85d9d9\nhttps://github.com/nilfs-dev/nilfs-utils/issues/26"], "statement": "This Moderate impact flaw in NILFS utilities allows a local attacker to trigger a Denial of Service. By supplying a crafted NILFS2 image, an attacker can cause tools like `nilfs-tune` or `dumpseg` to crash due to improper validation of superblock fields. This requires user interaction with a malicious file.", "threat_severity": "Moderate"}

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