CVE-2025-37858 (GCVE-0-2025-37858)

Vulnerability from cvelistv5 – Published: 2025-05-09 06:42 – Updated: 2026-05-11 21:16
VLAI
Title
fs/jfs: Prevent integer overflow in AG size calculation
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/jfs: Prevent integer overflow in AG size calculation The JFS filesystem calculates allocation group (AG) size using 1 << l2agsize in dbExtendFS(). When l2agsize exceeds 31 (possible with >2TB aggregates on 32-bit systems), this 32-bit shift operation causes undefined behavior and improper AG sizing. On 32-bit architectures: - Left-shifting 1 by 32+ bits results in 0 due to integer overflow - This creates invalid AG sizes (0 or garbage values) in sbi->bmap->db_agsize - Subsequent block allocations would reference invalid AG structures - Could lead to: - Filesystem corruption during extend operations - Kernel crashes due to invalid memory accesses - Security vulnerabilities via malformed on-disk structures Fix by casting to s64 before shifting: bmp->db_agsize = (s64)1 << l2agsize; This ensures 64-bit arithmetic even on 32-bit architectures. The cast matches the data type of db_agsize (s64) and follows similar patterns in JFS block calculation code. Found by Linux Verification Center (linuxtesting.org) with SVACE.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7034 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < dd07a985e2ded47b6c7d69fc93c1fe02977c8454 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8bb29629a5e4090e1ef7199cb42db04a52802239 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3d8a45f87010a802aa214bf39702ca9d99cbf3ba (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 55edbf5dbf60a8195c21e92124c4028939ae16b2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7ccf3b35274512b60ecb614e0637e76bd6f2d829 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c802a6a4009f585111f903e810b3be9c6d0da329 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 211ed8f5e39e61f9e4d18edd64ce8005a67a1b2a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ec34cdf4f917cc6abd306cf091f8b8361fedac88 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7fcbf789629cdb9fbf4e2172ce31136cfed11e5e (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.293 , ≤ 5.4.* (semver)
Unaffected: 5.10.237 , ≤ 5.10.* (semver)
Unaffected: 5.15.181 , ≤ 5.15.* (semver)
Unaffected: 6.1.135 , ≤ 6.1.* (semver)
Unaffected: 6.6.88 , ≤ 6.6.* (semver)
Unaffected: 6.12.24 , ≤ 6.12.* (semver)
Unaffected: 6.13.12 , ≤ 6.13.* (semver)
Unaffected: 6.14.3 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/jfs: Prevent integer overflow in AG size calculation\n\nThe JFS filesystem calculates allocation group (AG) size using 1 \u003c\u003c\nl2agsize in dbExtendFS(). When l2agsize exceeds 31 (possible with \u003e2TB\naggregates on 32-bit systems), this 32-bit shift operation causes undefined\nbehavior and improper AG sizing.\n\nOn 32-bit architectures:\n- Left-shifting 1 by 32+ bits results in 0 due to integer overflow\n- This creates invalid AG sizes (0 or garbage values) in\nsbi-\u003ebmap-\u003edb_agsize\n- Subsequent block allocations would reference invalid AG structures\n- Could lead to:\n  - Filesystem corruption during extend operations\n  - Kernel crashes due to invalid memory accesses\n  - Security vulnerabilities via malformed on-disk structures\n\nFix by casting to s64 before shifting:\nbmp-\u003edb_agsize = (s64)1 \u003c\u003c l2agsize;\n\nThis ensures 64-bit arithmetic even on 32-bit architectures. The cast\nmatches the data type of db_agsize (s64) and follows similar patterns in\nJFS block calculation code.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs/jfs: Evitar el desbordamiento de enteros en el c\u00e1lculo del tama\u00f1o de AG El sistema de archivos JFS calcula el tama\u00f1o del grupo de asignaci\u00f3n (AG) usando 1 \u0026lt;\u0026lt; l2agsize en dbExtendFS(). Cuando l2agsize supera 31 (posible con agregados de \u0026gt;2 TB en sistemas de 32 bits), esta operaci\u00f3n de desplazamiento de 32 bits provoca un comportamiento indefinido y un tama\u00f1o de AG incorrecto. En arquitecturas de 32 bits: - Desplazar 1 a la izquierda por 32+ bits da como resultado 0 debido al desbordamiento de enteros - Esto crea tama\u00f1os de AG no v\u00e1lidos (0 o valores basura) en sbi-\u0026gt;bmap-\u0026gt;db_agsize - Las asignaciones de bloques posteriores har\u00edan referencia a estructuras AG no v\u00e1lidas - Podr\u00eda conducir a: - Corrupci\u00f3n del sistema de archivos durante las operaciones de extensi\u00f3n - Fallos del kernel debido a accesos a memoria no v\u00e1lidos - Vulnerabilidades de seguridad mediante estructuras en disco malformadas Soluci\u00f3n mediante la conversi\u00f3n a s64 antes del desplazamiento: bmp-\u0026gt;db_agsize = (s64)1 \u0026lt;\u0026lt; l2agsize; Esto garantiza operaciones aritm\u00e9ticas de 64 bits incluso en arquitecturas de 32 bits. La conversi\u00f3n coincide con el tipo de dato de db_agsize (s64) y sigue patrones similares en el c\u00f3digo de c\u00e1lculo de bloques JFS. Encontrado por el Centro de Verificaci\u00f3n de Linux (linuxtesting.org) con SVACE."
          }
        ],
        "id": "CVE-2025-37858",
        "lastModified": "2026-06-17T09:15:34.747",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-05-09T07:16:06.827",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/211ed8f5e39e61f9e4d18edd64ce8005a67a1b2a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/3d8a45f87010a802aa214bf39702ca9d99cbf3ba"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/55edbf5dbf60a8195c21e92124c4028939ae16b2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/7ccf3b35274512b60ecb614e0637e76bd6f2d829"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/7fcbf789629cdb9fbf4e2172ce31136cfed11e5e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8bb29629a5e4090e1ef7199cb42db04a52802239"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c802a6a4009f585111f903e810b3be9c6d0da329"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/dd07a985e2ded47b6c7d69fc93c1fe02977c8454"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ec34cdf4f917cc6abd306cf091f8b8361fedac88"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-190"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T00:08:25+00:00",
      "cve": "CVE-2025-37858",
      "id": "CVE-2025-37858",
      "initial_release_date": "2025-05-09T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fs/jfs: Prevent integer overflow in AG size calculation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-37858.json",
      "version": "3"
    }
  }
}



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