CVE-2023-53083 (GCVE-0-2023-53083)

Vulnerability from cvelistv5 – Published: 2025-05-02 15:55 – Updated: 2025-05-04 07:49
VLAI?
Title
nfsd: don't replace page in rq_pages if it's a continuation of last page
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: don't replace page in rq_pages if it's a continuation of last page The splice read calls nfsd_splice_actor to put the pages containing file data into the svc_rqst->rq_pages array. It's possible however to get a splice result that only has a partial page at the end, if (e.g.) the filesystem hands back a short read that doesn't cover the whole page. nfsd_splice_actor will plop the partial page into its rq_pages array and return. Then later, when nfsd_splice_actor is called again, the remainder of the page may end up being filled out. At this point, nfsd_splice_actor will put the page into the array _again_ corrupting the reply. If this is done enough times, rq_next_page will overrun the array and corrupt the trailing fields -- the rq_respages and rq_next_page pointers themselves. If we've already added the page to the array in the last pass, don't add it to the array a second time when dealing with a splice continuation. This was originally handled properly in nfsd_splice_actor, but commit 91e23b1c3982 ("NFSD: Clean up nfsd_splice_actor()") removed the check for it.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bf1cbe2f3650b4f4a8add6af933c6d7f6af1f361 , < 8235cd619db6e67f1d7d26c55f1f3e4e575c947d (git)
Affected: 56bc7e3821e847a6cc8027ddaba32e9a440225a5 , < 12eca509234acb6b666802edf77408bb70d7bfca (git)
Affected: 91e23b1c39820bfed642119ff6b6ef9f43cf09ce , < 51ddb84baff6f09ad62b5999ece3ec172e4e3568 (git)
Affected: 91e23b1c39820bfed642119ff6b6ef9f43cf09ce , < 0101067f376eb7b9afd00279270f25d5111a091d (git)
Affected: 91e23b1c39820bfed642119ff6b6ef9f43cf09ce , < 27c934dd8832dd40fd34776f916dc201e18b319b (git)
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    Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.22 , ≤ 6.1.* (semver)
Unaffected: 6.2.9 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/vfs.c"
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.22",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: don\u0027t replace page in rq_pages if it\u0027s a continuation of last page\n\nThe splice read calls nfsd_splice_actor to put the pages containing file\ndata into the svc_rqst-\u003erq_pages array. It\u0027s possible however to get a\nsplice result that only has a partial page at the end, if (e.g.) the\nfilesystem hands back a short read that doesn\u0027t cover the whole page.\n\nnfsd_splice_actor will plop the partial page into its rq_pages array and\nreturn. Then later, when nfsd_splice_actor is called again, the\nremainder of the page may end up being filled out. At this point,\nnfsd_splice_actor will put the page into the array _again_ corrupting\nthe reply. If this is done enough times, rq_next_page will overrun the\narray and corrupt the trailing fields -- the rq_respages and\nrq_next_page pointers themselves.\n\nIf we\u0027ve already added the page to the array in the last pass, don\u0027t add\nit to the array a second time when dealing with a splice continuation.\nThis was originally handled properly in nfsd_splice_actor, but commit\n91e23b1c3982 (\"NFSD: Clean up nfsd_splice_actor()\") removed the check\nfor it."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:49:24.528Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8235cd619db6e67f1d7d26c55f1f3e4e575c947d"
        },
        {
          "url": "https://git.kernel.org/stable/c/12eca509234acb6b666802edf77408bb70d7bfca"
        },
        {
          "url": "https://git.kernel.org/stable/c/51ddb84baff6f09ad62b5999ece3ec172e4e3568"
        },
        {
          "url": "https://git.kernel.org/stable/c/0101067f376eb7b9afd00279270f25d5111a091d"
        },
        {
          "url": "https://git.kernel.org/stable/c/27c934dd8832dd40fd34776f916dc201e18b319b"
        }
      ],
      "title": "nfsd: don\u0027t replace page in rq_pages if it\u0027s a continuation of last page",
      "x_generator": {
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53083",
    "datePublished": "2025-05-02T15:55:31.699Z",
    "dateReserved": "2025-05-02T15:51:43.550Z",
    "dateUpdated": "2025-05-04T07:49:24.528Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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