CVE-2023-53711 (GCVE-0-2023-53711)
Vulnerability from cvelistv5
Published
2025-10-22 13:23
Modified
2026-08-05 09:15
Severity ?
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Summary
In the Linux kernel, the following vulnerability has been resolved: NFS: Fix a potential data corruption We must ensure that the subrequests are joined back into the head before we can retransmit a request. If the head was not on the commit lists, because the server wrote it synchronously, we still need to add it back to the retransmission list. Add a call that mirrors the effect of nfs_cancel_remove_inode() for O_DIRECT.
References
Impacted products
Vendor Product Version
Linux Linux Version: ed5d588fe47feef290f271022820e255d8371561
Version: ed5d588fe47feef290f271022820e255d8371561
Version: ed5d588fe47feef290f271022820e255d8371561
Version: ed5d588fe47feef290f271022820e255d8371561
Version: ed5d588fe47feef290f271022820e255d8371561
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/direct.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
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              "status": "affected",
              "version": "ed5d588fe47feef290f271022820e255d8371561",
              "versionType": "git"
            },
            {
              "lessThan": "dac14a1dbe20e003215dacb8a3a1a7e4ca4e0ad0",
              "status": "affected",
              "version": "ed5d588fe47feef290f271022820e255d8371561",
              "versionType": "git"
            },
            {
              "lessThan": "0ec26716e45d615edfff46012e7dedcc0ac5f7ab",
              "status": "affected",
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            },
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/direct.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "lessThan": "5.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.195",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.132",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.5.*",
              "status": "unaffected",
              "version": "6.5.4",
              "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": "5.10.195",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.132",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.54",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.5.4",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: Fix a potential data corruption\n\nWe must ensure that the subrequests are joined back into the head before\nwe can retransmit a request. If the head was not on the commit lists,\nbecause the server wrote it synchronously, we still need to add it back\nto the retransmission list.\nAdd a call that mirrors the effect of nfs_cancel_remove_inode() for\nO_DIRECT."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bug lives in the NFS client\u0027s O_DIRECT write path and is driven entirely by data from a remote peer \u2014 the server\u0027s per-WRITE `committed` level, the negotiated wsize that forces the page-group split, and the COMMIT write verifier that triggers `nfs_direct_write_reschedule()`. A malicious/compromised NFS server or an on-path attacker on unauthenticated AUTH_SYS NFS traffic reaches it over the network with no local access.\nAC:L - All three preconditions are server-controlled and can be produced deterministically and repeatedly: advertise a wsize that forces `__nfs_pageio_add_request()` to split a request into head+subrequest across two RPCs, answer one FILE_SYNC and the other UNSTABLE so only the subrequest lands on the commit list, then return a changed write verifier on COMMIT to force the reschedule.\nPR:N - The attacker is the remote NFS server (or an on-path attacker), which needs no credentials or privileges on the victim client; the vulnerable path runs in the client\u0027s normal write-completion/reschedule machinery.\nUI:N - No victim action is required beyond an already-mounted export carrying an ordinary O_DIRECT workload \u2014 the databases, VM images and backup jobs NFS O_DIRECT exists for. The reschedule runs asynchronously from `nfsiod` with no user involvement.\nS:U - The defect and its consequences are confined to the NFS client within the same kernel security authority; no VM, sandbox, or IOMMU boundary is crossed.\nC:N - Tracing the path shows no out-of-bounds read, no kernel-memory disclosure and no read primitive \u2014 subrequests hold krefs on the head and `nfs_page_group_destroy()`\u0027s deferred teardown prevents any use-after-free. The impact is confined to what gets written back.\nI:H - Retransmitting subrequests without rejoining them to the head means an O_DIRECT write is not faithfully re-driven to stable storage after the server discards its unstable cache, so file contents silently diverge from what the application wrote while `write()` still reports success \u2014 unbounded, undetected corruption of stored data on a shared network filesystem.\nA:L - The un-joined group never collapses, so each attacker-forced reschedule round re-splits requests and grafts more members onto a page-group ring that cannot be reclaimed until the whole dreq dies, degrading memory and lengthening the O(N) ring walks while the write fails to converge. I found no reachable panic, BUG_ON, or hang, so this is degradation rather than a full availability loss."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:15:39.362Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4185605cd0f72ec8bf8b423aacd94cd5ee13bbcf"
        },
        {
          "url": "https://git.kernel.org/stable/c/da302f1d476a44245823a74546debb5d160bf5bd"
        },
        {
          "url": "https://git.kernel.org/stable/c/dac14a1dbe20e003215dacb8a3a1a7e4ca4e0ad0"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ec26716e45d615edfff46012e7dedcc0ac5f7ab"
        },
        {
          "url": "https://git.kernel.org/stable/c/88975a55969e11f26fe3846bf4fbf8e7dc8cbbd4"
        }
      ],
      "title": "NFS: Fix a potential data corruption",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53711",
    "datePublished": "2025-10-22T13:23:46.458Z",
    "dateReserved": "2025-10-22T13:21:37.346Z",
    "dateUpdated": "2026-08-05T09:15:39.362Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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