CVE-2025-38579 (GCVE-0-2025-38579)
Vulnerability from cvelistv5
Published
2025-08-19 17:03
Modified
2025-08-28 14:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix KMSAN uninit-value in extent_info usage KMSAN reported a use of uninitialized value in `__is_extent_mergeable()` and `__is_back_mergeable()` via the read extent tree path. The root cause is that `get_read_extent_info()` only initializes three fields (`fofs`, `blk`, `len`) of `struct extent_info`, leaving the remaining fields uninitialized. This leads to undefined behavior when those fields are accessed later, especially during extent merging. Fix it by zero-initializing the `extent_info` struct before population.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/01b6f5955e0008af6bc3a181310d2744bb349800
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/08e8ab00a6d20d5544c932ee85a297d833895141
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0fa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/44a79437309e0ee2276ac17aaedc71253af253a8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cc1615d5aba4f396cf412579928539a2b124c8a0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e68b751ec2b15d866967812c57cfdfc1eba6a269
Impacted products
Vendor Product Version
Linux Linux Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
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   Linux Linux Version: 5.15
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/extent_cache.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix KMSAN uninit-value in extent_info usage\n\nKMSAN reported a use of uninitialized value in `__is_extent_mergeable()`\n and `__is_back_mergeable()` via the read extent tree path.\n\nThe root cause is that `get_read_extent_info()` only initializes three\nfields (`fofs`, `blk`, `len`) of `struct extent_info`, leaving the\nremaining fields uninitialized. This leads to undefined behavior\nwhen those fields are accessed later, especially during\nextent merging.\n\nFix it by zero-initializing the `extent_info` struct before population."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-28T14:43:58.673Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0fa"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38579",
    "datePublished": "2025-08-19T17:03:02.308Z",
    "dateReserved": "2025-04-16T04:51:24.026Z",
    "dateUpdated": "2025-08-28T14:43:58.673Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38579\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-19T17:15:35.020\",\"lastModified\":\"2025-08-28T15:15:54.273\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nf2fs: fix KMSAN uninit-value in extent_info usage\\n\\nKMSAN reported a use of uninitialized value in `__is_extent_mergeable()`\\n and `__is_back_mergeable()` via the read extent tree path.\\n\\nThe root cause is that `get_read_extent_info()` only initializes three\\nfields (`fofs`, `blk`, `len`) of `struct extent_info`, leaving the\\nremaining fields uninitialized. This leads to undefined behavior\\nwhen those fields are accessed later, especially during\\nextent merging.\\n\\nFix it by zero-initializing the `extent_info` struct before population.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: f2fs: correcci\u00f3n del valor no inicializado de KMSAN en el uso de extent_info. KMSAN inform\u00f3 del uso de un valor no inicializado en `__is_extent_mergeable()` y `__is_back_mergeable()` mediante la ruta de lectura del \u00e1rbol de extensiones. La causa principal es que `get_read_extent_info()` solo inicializa tres campos (`fofs`, `blk`, `len`) de `struct extent_info`, dejando los campos restantes sin inicializar. Esto provoca un comportamiento indefinido al acceder a dichos campos posteriormente, especialmente durante la fusi\u00f3n de extensiones. Para solucionarlo, inicialice a cero la estructura `extent_info` antes de rellenarla.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/01b6f5955e0008af6bc3a181310d2744bb349800\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/08e8ab00a6d20d5544c932ee85a297d833895141\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/44a79437309e0ee2276ac17aaedc71253af253a8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cc1615d5aba4f396cf412579928539a2b124c8a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e68b751ec2b15d866967812c57cfdfc1eba6a269\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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