CVE-2026-64357 (GCVE-0-2026-64357)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-08-17 04:54
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 966ceafc7a437105ecfe1cadb3747b2965a260ca
Version: 966ceafc7a437105ecfe1cadb3747b2965a260ca
Version: 966ceafc7a437105ecfe1cadb3747b2965a260ca
Version: 966ceafc7a437105ecfe1cadb3747b2965a260ca
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/libxfs/xfs_exchmaps.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "version": "6.12.96",
              "versionType": "semver"
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      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.96",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: fix exchmaps reservation limit check\n\nxfs_exchmaps_estimate_overhead() adds the bmbt and rmapbt\noverhead to a local resblks variable, but the final UINT_MAX\ncheck still tests req-\u003eresblks.  That is the reservation value\nfrom before the overhead was added.\n\nThe computed value is stored back in req-\u003eresblks and later passed\nto xfs_trans_alloc(), whose block reservation argument is unsigned\nint.  Check the computed reservation so the existing limit applies\nto the value that will be used."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:54:03.348Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3"
        },
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          "url": "https://git.kernel.org/stable/c/a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112"
        },
        {
          "url": "https://git.kernel.org/stable/c/4707344b0d36d1012c8a1716e20167cd3afdd5f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/0a5213bbff62b51c7d4999ac8c7e11ea57d00d45"
        }
      ],
      "title": "xfs: fix exchmaps reservation limit check",
      "x_generator": {
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64357",
    "datePublished": "2026-07-25T08:50:14.676Z",
    "dateReserved": "2026-07-19T15:36:31.782Z",
    "dateUpdated": "2026-08-17T04:54:03.348Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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