FKIE_CVE-2026-23235

Vulnerability from fkie_nvd - Published: 2026-03-04 15:16 - Updated: 2026-03-04 18:08
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix out-of-bounds access in sysfs attribute read/write Some f2fs sysfs attributes suffer from out-of-bounds memory access and incorrect handling of integer values whose size is not 4 bytes. For example: vm:~# echo 65537 > /sys/fs/f2fs/vde/carve_out vm:~# cat /sys/fs/f2fs/vde/carve_out 65537 vm:~# echo 4294967297 > /sys/fs/f2fs/vde/atgc_age_threshold vm:~# cat /sys/fs/f2fs/vde/atgc_age_threshold 1 carve_out maps to {struct f2fs_sb_info}->carve_out, which is a 8-bit integer. However, the sysfs interface allows setting it to a value larger than 255, resulting in an out-of-range update. atgc_age_threshold maps to {struct atgc_management}->age_threshold, which is a 64-bit integer, but its sysfs interface cannot correctly set values larger than UINT_MAX. The root causes are: 1. __sbi_store() treats all default values as unsigned int, which prevents updating integers larger than 4 bytes and causes out-of-bounds writes for integers smaller than 4 bytes. 2. f2fs_sbi_show() also assumes all default values are unsigned int, leading to out-of-bounds reads and incorrect access to integers larger than 4 bytes. This patch introduces {struct f2fs_attr}->size to record the actual size of the integer associated with each sysfs attribute. With this information, sysfs read and write operations can correctly access and update values according to their real data size, avoiding memory corruption and truncation.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a905e183c047577b154f08a78ac3039e9454703
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/438a405fbad6882df0e34b3e1a16839a71f04240
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4ef30b9f1641c9e877792df6b049f1cf507d002d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6a6c07a9b49e43f0df42d7118fc76aa555c73d98
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/98ea0039dbfdd00e5cc1b9a8afa40434476c0955
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d4a594dd952df123cbdcdee9b9640d9d55e4a954
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e85a99db9ab85dfc30d93b0ca0e9156f3127f55a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eebd72cff518ac87e660aefb8a41224bd88c32ce
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix out-of-bounds access in sysfs attribute read/write\n\nSome f2fs sysfs attributes suffer from out-of-bounds memory access and\nincorrect handling of integer values whose size is not 4 bytes.\n\nFor example:\nvm:~# echo 65537 \u003e /sys/fs/f2fs/vde/carve_out\nvm:~# cat /sys/fs/f2fs/vde/carve_out\n65537\nvm:~# echo 4294967297 \u003e /sys/fs/f2fs/vde/atgc_age_threshold\nvm:~# cat /sys/fs/f2fs/vde/atgc_age_threshold\n1\n\ncarve_out maps to {struct f2fs_sb_info}-\u003ecarve_out, which is a 8-bit\ninteger. However, the sysfs interface allows setting it to a value\nlarger than 255, resulting in an out-of-range update.\n\natgc_age_threshold maps to {struct atgc_management}-\u003eage_threshold,\nwhich is a 64-bit integer, but its sysfs interface cannot correctly set\nvalues larger than UINT_MAX.\n\nThe root causes are:\n1. __sbi_store() treats all default values as unsigned int, which\nprevents updating integers larger than 4 bytes and causes out-of-bounds\nwrites for integers smaller than 4 bytes.\n\n2. f2fs_sbi_show() also assumes all default values are unsigned int,\nleading to out-of-bounds reads and incorrect access to integers larger\nthan 4 bytes.\n\nThis patch introduces {struct f2fs_attr}-\u003esize to record the actual size\nof the integer associated with each sysfs attribute. With this\ninformation, sysfs read and write operations can correctly access and\nupdate values according to their real data size, avoiding memory\ncorruption and truncation."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nf2fs: corrige el acceso fuera de l\u00edmites en la lectura/escritura de atributos sysfs\n\nAlgunos atributos sysfs de f2fs sufren de acceso a memoria fuera de l\u00edmites y manejo incorrecto de valores enteros cuyo tama\u00f1o no es de 4 bytes.\n\nPor ejemplo:\nvm:~# echo 65537 \u0026gt; /sys/fs/f2fs/vde/carve_out\nvm:~# cat /sys/fs/f2fs/vde/carve_out\n65537\nvm:~# echo 4294967297 \u0026gt; /sys/fs/f2fs/vde/atgc_age_threshold\nvm:~# cat /sys/fs/f2fs/vde/atgc_age_threshold\n1\n\ncarve_out se mapea a {struct f2fs_sb_info}-\u0026gt;carve_out, que es un entero de 8 bits. Sin embargo, la interfaz sysfs permite establecerlo a un valor mayor que 255, lo que resulta en una actualizaci\u00f3n fuera de rango.\n\natgc_age_threshold se mapea a {struct atgc_management}-\u0026gt;age_threshold, que es un entero de 64 bits, pero su interfaz sysfs no puede establecer correctamente valores mayores que UINT_MAX.\n\nLas causas ra\u00edz son:\n1. __sbi_store() trata todos los valores predeterminados como unsigned int, lo que impide actualizar enteros mayores de 4 bytes y causa escrituras fuera de l\u00edmites para enteros menores de 4 bytes.\n\n2. f2fs_sbi_show() tambi\u00e9n asume que todos los valores predeterminados son unsigned int, lo que lleva a lecturas fuera de l\u00edmites y acceso incorrecto a enteros mayores de 4 bytes.\n\nEste parche introduce {struct f2fs_attr}-\u0026gt;size para registrar el tama\u00f1o real del entero asociado con cada atributo sysfs. Con esta informaci\u00f3n, las operaciones de lectura y escritura de sysfs pueden acceder y actualizar valores correctamente seg\u00fan su tama\u00f1o de datos real, evitando la corrupci\u00f3n de memoria y la truncaci\u00f3n."
    }
  ],
  "id": "CVE-2026-23235",
  "lastModified": "2026-03-04T18:08:05.730",
  "metrics": {},
  "published": "2026-03-04T15:16:13.977",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3a905e183c047577b154f08a78ac3039e9454703"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/438a405fbad6882df0e34b3e1a16839a71f04240"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4ef30b9f1641c9e877792df6b049f1cf507d002d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6a6c07a9b49e43f0df42d7118fc76aa555c73d98"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/98ea0039dbfdd00e5cc1b9a8afa40434476c0955"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d4a594dd952df123cbdcdee9b9640d9d55e4a954"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e85a99db9ab85dfc30d93b0ca0e9156f3127f55a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/eebd72cff518ac87e660aefb8a41224bd88c32ce"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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