debugfs: Fix lockdown check for mmap_prepare

{
  "id": "771d80740df8c26a5ecf2d471e9a1601c87c424f1c392c1d5edbdd1e24a471c4",
  "url": "https://osv.dev/vulnerability/CVE-2026-89745",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "debugfs: Fix lockdown check for mmap_prepare",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: debugfs: Fix lockdown check for mmap_prepare Commit 651fdda8406d (\"relay: update relay to use mmap_prepare\") changed the `mmap` file operation to `mmap_prepare` for relayfs, but the lockdown check in debugfs was not updated accordingly. This prevents debugfs from being locked down when the kernel is in integrity mode if a file uses `mmap_prepare` but not `mmap`. Since the conversion to `mmap_prepare` across the kernel is not yet complete, update the lockdown check to look for both `mmap` and `mmap_prepare` to ensure comprehensive coverage.",
    "evidence": "osv:CVE-2026-89745",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89745",
      "aliases": [
        "CVE-2026-89745"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "651fdda8406d42a5004c5c79f269540a85d6a1ab"
                },
                {
                  "fixed": "e7f6a6b5741d16fdac7adaecbe0fa52ae756f208"
                },
                {
                  "fixed": "f81808de37338aac8e167f99bfae647b1b835c70"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89745.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89745.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.526439671Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/e7f6a6b5741d16fdac7adaecbe0fa52ae756f208",
        "https://git.kernel.org/stable/c/f81808de37338aac8e167f99bfae647b1b835c70",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89745.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89745",
        "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/2026/89xxx/CVE-2026-89745.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89745",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 509215,
  "published_at": "2026-09-11T19:46:50.758+00:00"
}