fkie_cve-2025-38579
Vulnerability from fkie_nvd
Published
2025-08-19 17:15
Modified
2025-11-03 18:16
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
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Impacted products
Vendor Product Version


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{
  "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."
    }
  ],
  "id": "CVE-2025-38579",
  "lastModified": "2025-11-03T18:16:30.413",
  "metrics": {},
  "published": "2025-08-19T17:15:35.020",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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