CVE-2026-23235 (GCVE-0-2026-23235)
Vulnerability from cvelistv5
Published
2026-03-04 14:36
Modified
2026-04-13 06:02
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
Impacted products
Vendor Product Version
Linux Linux Version: b59d0bae6ca30c496f298881616258f9cde0d9c6
Version: b59d0bae6ca30c496f298881616258f9cde0d9c6
Version: b59d0bae6ca30c496f298881616258f9cde0d9c6
Version: b59d0bae6ca30c496f298881616258f9cde0d9c6
Version: b59d0bae6ca30c496f298881616258f9cde0d9c6
Version: b59d0bae6ca30c496f298881616258f9cde0d9c6
Version: b59d0bae6ca30c496f298881616258f9cde0d9c6
Version: b59d0bae6ca30c496f298881616258f9cde0d9c6
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/sysfs.c"
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          "vendor": "Linux",
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            },
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-13T06:02:52.760Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e85a99db9ab85dfc30d93b0ca0e9156f3127f55a"
        },
        {
          "url": "https://git.kernel.org/stable/c/438a405fbad6882df0e34b3e1a16839a71f04240"
        },
        {
          "url": "https://git.kernel.org/stable/c/6a6c07a9b49e43f0df42d7118fc76aa555c73d98"
        },
        {
          "url": "https://git.kernel.org/stable/c/eebd72cff518ac87e660aefb8a41224bd88c32ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ef30b9f1641c9e877792df6b049f1cf507d002d"
        },
        {
          "url": "https://git.kernel.org/stable/c/d4a594dd952df123cbdcdee9b9640d9d55e4a954"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a905e183c047577b154f08a78ac3039e9454703"
        },
        {
          "url": "https://git.kernel.org/stable/c/98ea0039dbfdd00e5cc1b9a8afa40434476c0955"
        }
      ],
      "title": "f2fs: fix out-of-bounds access in sysfs attribute read/write",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23235",
    "datePublished": "2026-03-04T14:36:39.537Z",
    "dateReserved": "2026-01-13T15:37:45.988Z",
    "dateUpdated": "2026-04-13T06:02:52.760Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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