xfs: don't wrap around quota ids in dqiterate

{
  "id": "6703726e1d1ffb679b93cc9fa182a1b49817ee22e5e699175e36577ff114d0fa",
  "url": "https://osv.dev/vulnerability/CVE-2026-64256",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xfs: don't wrap around quota ids in dqiterate",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: xfs: don't wrap around quota ids in dqiterate LOLLM noticed that q_id is an unsigned 32-bit variable. If it happens to be set to XFS_DQ_ID_MAX due to a filesystem that actually has a dquot for ID_MAX, then this addition will truncate to zero and the iteration starts over. Fix this by casting to u64.",
    "evidence": "osv:CVE-2026-64256",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.96",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.39",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-64256",
      "aliases": [
        "CVE-2026-64256"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "21d7500929c8a0b10e22a6755850c6f9a9280284"
                },
                {
                  "fixed": "249e311c2ba392ceaf9ebfc145a46922946f069a"
                },
                {
                  "fixed": "d1c4c40599c376aeb0c93068a2ae344e79ee4b90"
                },
                {
                  "fixed": "2b14fe1e0924c6b901f4256456342569c5397abe"
                },
                {
                  "fixed": "d766e4e5e85d829629c3ba503802fe1303d7b591"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64256.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.8.0"
                },
                {
                  "fixed": "6.12.96"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.39"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64256.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.860724709Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/249e311c2ba392ceaf9ebfc145a46922946f069a",
        "https://git.kernel.org/stable/c/2b14fe1e0924c6b901f4256456342569c5397abe",
        "https://git.kernel.org/stable/c/d1c4c40599c376aeb0c93068a2ae344e79ee4b90",
        "https://git.kernel.org/stable/c/d766e4e5e85d829629c3ba503802fe1303d7b591",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64256.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64256",
        "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/2026/64xxx/CVE-2026-64256.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64256",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 506937,
  "published_at": "2026-07-25T08:49:08.676+00:00"
}