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DEBIAN-CVE-2026-55392

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-55392

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-55392

nilfs-tools

Source reference: /affected/0/package/name

Affected versions
2.2.11-1

Source reference: /affected/0/versions

2.2.11-2

Source reference: /affected/0/versions

2.2.9-1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

nilfs-tools

Source reference: /affected/1/package/name

Affected versions
2.2.11-2

Source reference: /affected/1/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

nilfs-tools

Source reference: /affected/2/package/name

Affected versions
2.2.11-2

Source reference: /affected/2/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "nilfs-tools",
      "purl": "pkg:deb/debian/nilfs-tools?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2.2.11-1",
      "2.2.11-2",
      "2.2.9-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55392.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "nilfs-tools",
      "purl": "pkg:deb/debian/nilfs-tools?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2.2.11-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55392.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "nilfs-tools",
      "purl": "pkg:deb/debian/nilfs-tools?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2.2.11-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55392.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57929 · Revision 1
Added to Heist Feed
Publisher date
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