xfs: fix exchmaps reservation limit check

{
  "id": "fa1c1c9eb17f15867ec23a59fb90fd6705667629e9fb4817b69701c09bcb10b8",
  "url": "https://osv.dev/vulnerability/CVE-2026-64357",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xfs: fix exchmaps reservation limit check",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: xfs: fix exchmaps reservation limit check xfs_exchmaps_estimate_overhead() adds the bmbt and rmapbt overhead to a local resblks variable, but the final UINT_MAX check still tests req->resblks. That is the reservation value from before the overhead was added. The computed value is stored back in req->resblks and later passed to xfs_trans_alloc(), whose block reservation argument is unsigned int. Check the computed reservation so the existing limit applies to the value that will be used.",
    "evidence": "osv:CVE-2026-64357",
    "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-2026-64357",
      "aliases": [
        "CVE-2026-64357"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "966ceafc7a437105ecfe1cadb3747b2965a260ca"
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                  "fixed": "c597c8580d50127fc1221b5a5b653a94d49e23e3"
                },
                {
                  "fixed": "a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112"
                },
                {
                  "fixed": "4707344b0d36d1012c8a1716e20167cd3afdd5f1"
                },
                {
                  "fixed": "0a5213bbff62b51c7d4999ac8c7e11ea57d00d45"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64357.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.10.0"
                },
                {
                  "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-2026-64357.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.507935312Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0a5213bbff62b51c7d4999ac8c7e11ea57d00d45",
        "https://git.kernel.org/stable/c/4707344b0d36d1012c8a1716e20167cd3afdd5f1",
        "https://git.kernel.org/stable/c/a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112",
        "https://git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64357.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64357",
        "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-2026-64357.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64357",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 520107,
  "published_at": "2026-07-25T08:50:14.676+00:00"
}