dax: read holder_ops once in dax_holder_notify_failure()

{
  "id": "ba434ccb22018bdd2f93e51ceb5b3a67bc075561306bb15d77f434877786f1f3",
  "url": "https://osv.dev/vulnerability/CVE-2026-93073",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "dax: read holder_ops once in dax_holder_notify_failure()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: dax: read holder_ops once in dax_holder_notify_failure() dax_holder_notify_failure() reads dax_dev->holder_ops twice without READ_ONCE() -- once for the NULL check and once for the indirect notify_failure() call. A concurrent fs_put_dax() can clear holder_ops between the two reads, so the check can observe a non-NULL pointer while the call dereferences NULL. (kill_dax() also clears holder_ops, but only after synchronize_srcu(), so it cannot race a reader that is inside dax_read_lock(); fs_put_dax() does no such synchronization.) Fetch holder_ops once into a local with READ_ONCE() so the NULL check and the indirect call observe the same value.",
    "evidence": "osv:CVE-2026-93073",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-93073",
      "aliases": [
        "CVE-2026-93073"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8012b866085523758780850087102421dbcce522"
                },
                {
                  "fixed": "1661b9bf78def01a8c96409569772d9b2592f4ba"
                },
                {
                  "fixed": "0a42180d5410c98829ee72d1d426fb7faf9e6873"
                },
                {
                  "fixed": "ee1251621d1c7cf3155c6704542cbb358d799968"
                },
                {
                  "fixed": "6a37acecc7c29136235cbc446a1b89e81414344b"
                },
                {
                  "fixed": "eb412f80311fc7ab6eb3203091a3fe59a5e9fd30"
                },
                {
                  "fixed": "7ae9d15bdcde0f2955ae13b6a95587f9e23b2359"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93073.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.0.0"
                },
                {
                  "fixed": "6.1.188"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.157"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.110"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.52"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93073.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.192789917Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0a42180d5410c98829ee72d1d426fb7faf9e6873",
        "https://git.kernel.org/stable/c/1661b9bf78def01a8c96409569772d9b2592f4ba",
        "https://git.kernel.org/stable/c/6a37acecc7c29136235cbc446a1b89e81414344b",
        "https://git.kernel.org/stable/c/7ae9d15bdcde0f2955ae13b6a95587f9e23b2359",
        "https://git.kernel.org/stable/c/eb412f80311fc7ab6eb3203091a3fe59a5e9fd30",
        "https://git.kernel.org/stable/c/ee1251621d1c7cf3155c6704542cbb358d799968",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93073.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93073",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93073.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93073",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 494955,
  "published_at": "2026-09-17T16:10:56.405+00:00"
}