CVE-2026-53393 (GCVE-0-2026-53393)
Vulnerability from cvelistv5
Published
2026-07-19 12:01
Modified
2026-08-17 04:50
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: reset write verifier on deferred writeback errors nfsd_vfs_write() and nfsd_commit() both call filemap_check_wb_err() to detect deferred writeback errors, but neither rotates the server's write verifier (nn->writeverf) when this check fails. Every other durable-storage-failure path in these functions calls commit_reset_write_verifier() before returning an error. The missing rotation means clients holding UNSTABLE write data under the current verifier will COMMIT, receive the unchanged verifier back, and conclude their data is durable — silently dropping data that failed writeback. This violates the UNSTABLE+COMMIT durability contract (RFC 1813 §3.3.7, RFC 8881 §18.32). Add commit_reset_write_verifier() calls at both filemap_check_wb_err() error sites, matching the pattern used by adjacent error paths in the same functions. The helper already filters -EAGAIN and -ESTALE internally, so the calls are unconditionally safe.
References
Impacted products
Vendor Product Version
Linux Linux Version: f14816f2f928c560d28ba344af689f56efcd6f55
Version: 3145fe0ebb16e1715ad541a301bc6675c8375fcd
Version: 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb
Version: 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb
Version: 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb
Version: 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb
Version: 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb
Version: 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb
Version: 5.10.124   ≤
Version: 5.15.49   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "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": "b8e5894e56cff70fa245628fe16f0ad6367f8090",
              "status": "affected",
              "version": "f14816f2f928c560d28ba344af689f56efcd6f55",
              "versionType": "git"
            },
            {
              "lessThan": "bc2baca02ec56da7707a74ed5d340b0a1dff1841",
              "status": "affected",
              "version": "3145fe0ebb16e1715ad541a301bc6675c8375fcd",
              "versionType": "git"
            },
            {
              "lessThan": "43b65d2997963e80e8d8d86520bcb1e0751227de",
              "status": "affected",
              "version": "555dbf1a9aac6d3150c8b52fa35f768a692f4eeb",
              "versionType": "git"
            },
            {
              "lessThan": "666e837b247fcadf2d8d508b9b0e49d720393eb4",
              "status": "affected",
              "version": "555dbf1a9aac6d3150c8b52fa35f768a692f4eeb",
              "versionType": "git"
            },
            {
              "lessThan": "1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e",
              "status": "affected",
              "version": "555dbf1a9aac6d3150c8b52fa35f768a692f4eeb",
              "versionType": "git"
            },
            {
              "lessThan": "4367afc119c51e17a616f6908772b7e2c2c4013f",
              "status": "affected",
              "version": "555dbf1a9aac6d3150c8b52fa35f768a692f4eeb",
              "versionType": "git"
            },
            {
              "lessThan": "b027cca33c97354149fcc0ddeede4525c41093cd",
              "status": "affected",
              "version": "555dbf1a9aac6d3150c8b52fa35f768a692f4eeb",
              "versionType": "git"
            },
            {
              "lessThan": "2090b05803faab8a9fa62fbff871007862cac1b7",
              "status": "affected",
              "version": "555dbf1a9aac6d3150c8b52fa35f768a692f4eeb",
              "versionType": "git"
            },
            {
              "lessThan": "5.10.261",
              "status": "affected",
              "version": "5.10.124",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.212",
              "status": "affected",
              "version": "5.15.49",
              "versionType": "semver"
            }
          ]
        },
        {
          "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": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.38",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "5.10.124",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "5.15.49",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.95",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.38",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.3",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: reset write verifier on deferred writeback errors\n\nnfsd_vfs_write() and nfsd_commit() both call filemap_check_wb_err() to\ndetect deferred writeback errors, but neither rotates the server\u0027s write\nverifier (nn-\u003ewriteverf) when this check fails. Every other\ndurable-storage-failure path in these functions calls\ncommit_reset_write_verifier() before returning an error.\n\nThe missing rotation means clients holding UNSTABLE write data under the\ncurrent verifier will COMMIT, receive the unchanged verifier back, and\nconclude their data is durable \u2014 silently dropping data that failed\nwriteback. This violates the UNSTABLE+COMMIT durability contract\n(RFC 1813 \u00a73.3.7, RFC 8881 \u00a718.32).\n\nAdd commit_reset_write_verifier() calls at both filemap_check_wb_err()\nerror sites, matching the pattern used by adjacent error paths in the\nsame functions. The helper already filters -EAGAIN and -ESTALE\ninternally, so the calls are unconditionally safe."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:50:44.847Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b8e5894e56cff70fa245628fe16f0ad6367f8090"
        },
        {
          "url": "https://git.kernel.org/stable/c/bc2baca02ec56da7707a74ed5d340b0a1dff1841"
        },
        {
          "url": "https://git.kernel.org/stable/c/43b65d2997963e80e8d8d86520bcb1e0751227de"
        },
        {
          "url": "https://git.kernel.org/stable/c/666e837b247fcadf2d8d508b9b0e49d720393eb4"
        },
        {
          "url": "https://git.kernel.org/stable/c/1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e"
        },
        {
          "url": "https://git.kernel.org/stable/c/4367afc119c51e17a616f6908772b7e2c2c4013f"
        },
        {
          "url": "https://git.kernel.org/stable/c/b027cca33c97354149fcc0ddeede4525c41093cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/2090b05803faab8a9fa62fbff871007862cac1b7"
        }
      ],
      "title": "nfsd: reset write verifier on deferred writeback errors",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53393",
    "datePublished": "2026-07-19T12:01:56.684Z",
    "dateReserved": "2026-06-09T07:44:35.402Z",
    "dateUpdated": "2026-08-17T04:50:44.847Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.