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CVE-2025-37858

Estado: AnalizadaMedia (5.5)—

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

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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.

Detalles técnicos trazas, registros y código del informe original
Fix by casting to s64 before shifting:
bmp->db_agsize = (s64)1 << l2agsize;

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Debian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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      "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 <<\nl2agsize in dbExtendFS(). When l2agsize exceeds 31 (possible with >2TB\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->bmap->db_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->db_agsize = (s64)1 << 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 cálculo del tamaño de AG El sistema de archivos JFS calcula el tamaño del grupo de asignación (AG) usando 1 &lt;&lt; l2agsize en dbExtendFS(). Cuando l2agsize supera 31 (posible con agregados de &gt;2 TB en sistemas de 32 bits), esta operación de desplazamiento de 32 bits provoca un comportamiento indefinido y un tamaño 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 tamaños de AG no válidos (0 o valores basura) en sbi-&gt;bmap-&gt;db_agsize - Las asignaciones de bloques posteriores harían referencia a estructuras AG no válidas - Podría conducir a: - Corrupción del sistema de archivos durante las operaciones de extensión - Fallos del kernel debido a accesos a memoria no válidos - Vulnerabilidades de seguridad mediante estructuras en disco malformadas Solución mediante la conversión a s64 antes del desplazamiento: bmp-&gt;db_agsize = (s64)1 &lt;&lt; l2agsize; Esto garantiza operaciones aritméticas de 64 bits incluso en arquitecturas de 32 bits. La conversión coincide con el tipo de dato de db_agsize (s64) y sigue patrones similares en el código de cálculo de bloques JFS. Encontrado por el Centro de Verificación de Linux (linuxtesting.org) con SVACE."
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