fkie_cve-2025-37858
Vulnerability from fkie_nvd
Published
2025-05-09 07:16
Modified
2025-11-12 20:09
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/211ed8f5e39e61f9e4d18edd64ce8005a67a1b2aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3d8a45f87010a802aa214bf39702ca9d99cbf3baPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55edbf5dbf60a8195c21e92124c4028939ae16b2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ccf3b35274512b60ecb614e0637e76bd6f2d829Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7fcbf789629cdb9fbf4e2172ce31136cfed11e5ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8bb29629a5e4090e1ef7199cb42db04a52802239Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c802a6a4009f585111f903e810b3be9c6d0da329Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd07a985e2ded47b6c7d69fc93c1fe02977c8454Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ec34cdf4f917cc6abd306cf091f8b8361fedac88Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/05/msg00030.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/05/msg00045.htmlMailing List, Third Party Advisory
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
debian debian_linux 11.0


To clipboard 

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  "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."
    }
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  "id": "CVE-2025-37858",
  "lastModified": "2025-11-12T20:09:28.507",
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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        "impactScore": 3.6,
        "source": "nvd@nist.gov",
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}


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