github - ghsa-4v4w-685q-cqmx

GHSA-4V4W-685Q-CQMX

Vulnerability from github – Published: 2025-09-17 15:30 – Updated: 2025-09-17 15:30

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2023-53360"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-17T15:15:40Z",
    "severity": null
  },
  "details": "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": "GHSA-4v4w-685q-cqmx",
  "modified": "2025-09-17T15:30:39Z",
  "published": "2025-09-17T15:30:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53360"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/303a78052091c81e9003915c521fdca1c7e117af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a2f4cb206bd94b3f4a7bb05fcdce9525283b5681"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/adac9f0ddd2b291c7ce41f549fdb27a13616cff5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae5d5672f1db711e91db6f52df5cb16ecd8f5692"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2023-53360 (GCVE-0-2023-53360)

Vulnerability from cvelistv5 – Published: 2025-09-17 14:56 – Updated: 2025-09-17 14:56

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.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/adac9f0ddd2b291c7…
	https://git.kernel.org/stable/c/a2f4cb206bd94b3f4…
	https://git.kernel.org/stable/c/ae5d5672f1db711e9…
	https://git.kernel.org/stable/c/303a78052091c81e9…

Impacted products

Vendor

Product

Version

Linux

Affected: 886959f425b6a936a30b82a297ae3aecb3b8230f , < adac9f0ddd2b291c7ce41f549fdb27a13616cff5 (git)
Affected: fbd2a05f29a95d5b42b294bf47e55a711424965b , < a2f4cb206bd94b3f4a7bb05fcdce9525283b5681 (git)
Affected: fbd2a05f29a95d5b42b294bf47e55a711424965b , < ae5d5672f1db711e91db6f52df5cb16ecd8f5692 (git)
Affected: fbd2a05f29a95d5b42b294bf47e55a711424965b , < 303a78052091c81e9003915c521fdca1c7e117af (git)

Linux

Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.4.16 , ≤ 6.4.* (semver)
Unaffected: 6.5.3 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/internal.h",
            "fs/nfs/nfs42.h",
            "fs/nfs/nfs42xdr.c",
            "fs/nfs/nfs4proc.c",
            "fs/nfs/read.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "adac9f0ddd2b291c7ce41f549fdb27a13616cff5",
              "status": "affected",
              "version": "886959f425b6a936a30b82a297ae3aecb3b8230f",
              "versionType": "git"
            },
            {
              "lessThan": "a2f4cb206bd94b3f4a7bb05fcdce9525283b5681",
              "status": "affected",
              "version": "fbd2a05f29a95d5b42b294bf47e55a711424965b",
              "versionType": "git"
            },
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            },
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/internal.h",
            "fs/nfs/nfs42.h",
            "fs/nfs/nfs42xdr.c",
            "fs/nfs/nfs4proc.c",
            "fs/nfs/read.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.5.*",
              "status": "unaffected",
              "version": "6.5.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4.16",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.4",
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                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                }
              ],
              "negate": false,
              "operator": "OR"
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-17T14:56:50.287Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/adac9f0ddd2b291c7ce41f549fdb27a13616cff5"
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        },
        {
          "url": "https://git.kernel.org/stable/c/ae5d5672f1db711e91db6f52df5cb16ecd8f5692"
        },
        {
          "url": "https://git.kernel.org/stable/c/303a78052091c81e9003915c521fdca1c7e117af"
        }
      ],
      "title": "NFSv4.2: Rework scratch handling for READ_PLUS (again)",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53360",
    "datePublished": "2025-09-17T14:56:50.287Z",
    "dateReserved": "2025-09-17T14:54:09.733Z",
    "dateUpdated": "2025-09-17T14:56:50.287Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-4V4W-685Q-CQMX

CVE-2023-53360 (GCVE-0-2023-53360)

Tags

Sightings

Nomenclature