fkie_cve-2023-53360
Vulnerability from fkie_nvd
Published
2025-09-17 15:15
Modified
2025-09-18 13:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSv4.2: Rework scratch handling for READ_PLUS (again) I found that the read code might send multiple requests using the same nfs_pgio_header, but nfs4_proc_read_setup() is only called once. This is how we ended up occasionally double-freeing the scratch buffer, but also means we set a NULL pointer but non-zero length to the xdr scratch buffer. This results in an oops the first time decoding needs to copy something to scratch, which frequently happens when decoding READ_PLUS hole segments. I fix this by moving scratch handling into the pageio read code. I provide a function to allocate scratch space for decoding read replies, and free the scratch buffer when the nfs_pgio_header is freed.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/303a78052091c81e9003915c521fdca1c7e117af
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a2f4cb206bd94b3f4a7bb05fcdce9525283b5681
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/adac9f0ddd2b291c7ce41f549fdb27a13616cff5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ae5d5672f1db711e91db6f52df5cb16ecd8f5692
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\nNFSv4.2: Rework scratch handling for READ_PLUS (again)\n\nI found that the read code might send multiple requests using the same\nnfs_pgio_header, but nfs4_proc_read_setup() is only called once. This is\nhow we ended up occasionally double-freeing the scratch buffer, but also\nmeans we set a NULL pointer but non-zero length to the xdr scratch\nbuffer. This results in an oops the first time decoding needs to copy\nsomething to scratch, which frequently happens when decoding READ_PLUS\nhole segments.\n\nI fix this by moving scratch handling into the pageio read code. I\nprovide a function to allocate scratch space for decoding read replies,\nand free the scratch buffer when the nfs_pgio_header is freed."
    }
  ],
  "id": "CVE-2023-53360",
  "lastModified": "2025-09-18T13:43:34.310",
  "metrics": {},
  "published": "2025-09-17T15:15:40.123",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/303a78052091c81e9003915c521fdca1c7e117af"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a2f4cb206bd94b3f4a7bb05fcdce9525283b5681"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/adac9f0ddd2b291c7ce41f549fdb27a13616cff5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ae5d5672f1db711e91db6f52df5cb16ecd8f5692"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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