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GHSA-7WGQ-P9VG-WMW2

Vulnerability from github – Published: 2025-05-02 18:31 – Updated: 2025-11-12 21:31

Details

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

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2023-53083"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-02T16:15:27Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-7wgq-p9vg-wmw2",
  "modified": "2025-11-12T21:31:00Z",
  "published": "2025-05-02T18:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53083"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0101067f376eb7b9afd00279270f25d5111a091d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/12eca509234acb6b666802edf77408bb70d7bfca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/27c934dd8832dd40fd34776f916dc201e18b319b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/51ddb84baff6f09ad62b5999ece3ec172e4e3568"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8235cd619db6e67f1d7d26c55f1f3e4e575c947d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2025-05-02 15:55 – Updated: 2026-08-05 09:12

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

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/8235cd619db6e67f1…
https://git.kernel.org/stable/c/12eca509234acb6b6…
https://git.kernel.org/stable/c/51ddb84baff6f09ad…
https://git.kernel.org/stable/c/0101067f376eb7b9a…
https://git.kernel.org/stable/c/27c934dd8832dd40f…

Impacted products

2 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)
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": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/vfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8235cd619db6e67f1d7d26c55f1f3e4e575c947d",
              "status": "affected",
              "version": "bf1cbe2f3650b4f4a8add6af933c6d7f6af1f361",
              "versionType": "git"
            },
            {
              "lessThan": "12eca509234acb6b666802edf77408bb70d7bfca",
              "status": "affected",
              "version": "56bc7e3821e847a6cc8027ddaba32e9a440225a5",
              "versionType": "git"
            },
            {
              "lessThan": "51ddb84baff6f09ad62b5999ece3ec172e4e3568",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "0101067f376eb7b9afd00279270f25d5111a091d",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "27c934dd8832dd40fd34776f916dc201e18b319b",
              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/vfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.22",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.9",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bug is in nfsd_splice_actor on the NFSv2/v3/v4 READ splice path, reached by sending NFS READ RPCs to the in-kernel NFS server over TCP/UDP port 2049 from a remote client; no local access is required.\nAC:L - A remote client fully controls READ offsets/lengths and can retry at will; real-world Android/Kodi clients reliably triggered the partial-page splice continuation that causes the duplicate insert and array overrun, with no race outside attacker influence.\nPR:N - Under typical AUTH_SYS/AUTH_UNIX exports the client self-asserts uid/gid with no cryptographic secret; any host permitted by the export list can LOOKUP/OPEN and issue READ with no server-verified privileges.\nUI:N - The attacking NFS client issues the READ requests itself; no action by any administrator or other user on the server is required.\nS:U - The overrun corrupts fields inside the server\u0027s svc_rqst within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The OOB write corrupts rq_respages/rq_next_page and was observed to drive page/folio refcount underflow, creating a UAF-class primitive over page-cache objects that can be leveraged for arbitrary kernel memory disclosure.\nI:H - Unbounded svc_rqst_replace_page writes of page pointers past rq_pages overwrite adjacent kernel pointers and skew page refcounts, yielding an out-of-bounds write / UAF write primitive exploitable for control-flow hijack.\nA:H - Production reports show repeatable nfsd kthread GPFs in release_pages and VM_BUG_ON folio refcount underflow during splice READ cleanup, crashing or freezing the NFS server and requiring reboot."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:12:39.153Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8235cd619db6e67f1d7d26c55f1f3e4e575c947d"
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          "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": {
        "engine": "bippy-1.2.0"
      }
    }
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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": "2026-08-05T09:12:39.153Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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