{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "555dbf1a9aac6d3150c8b52fa35f768a692f4eeb"
            },
            {
              "fixed": "1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e"
            },
            {
              "fixed": "4367afc119c51e17a616f6908772b7e2c2c4013f"
            },
            {
              "fixed": "b027cca33c97354149fcc0ddeede4525c41093cd"
            },
            {
              "fixed": "2090b05803faab8a9fa62fbff871007862cac1b7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "f14816f2f928c560d28ba344af689f56efcd6f55"
            },
            {
              "last_affected": "3145fe0ebb16e1715ad541a301bc6675c8375fcd"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.10.124"
            },
            {
              "fixed": "5.11"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.15.49"
            },
            {
              "fixed": "5.16"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.17.0"
            },
            {
              "fixed": "6.12.95"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.38"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53393.json"
  },
  "details": "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's 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 — silently dropping data that failed\nwriteback. This violates the UNSTABLE+COMMIT durability contract\n(RFC 1813 §3.3.7, RFC 8881 §18.32).\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.",
  "id": "CVE-2026-53393",
  "modified": "2026-07-21T03:41:45.885030640Z",
  "published": "2026-07-19T12:01:56.684Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2090b05803faab8a9fa62fbff871007862cac1b7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4367afc119c51e17a616f6908772b7e2c2c4013f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b027cca33c97354149fcc0ddeede4525c41093cd"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53393.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53393"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "nfsd: reset write verifier on deferred writeback errors"
}