FKIE_CVE-2026-64357

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-07-25 10:17
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0a5213bbff62b51c7d4999ac8c7e11ea57d00d45
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4707344b0d36d1012c8a1716e20167cd3afdd5f1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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",
          "versions": [
            {
              "lessThan": "c597c8580d50127fc1221b5a5b653a94d49e23e3",
              "status": "affected",
              "version": "966ceafc7a437105ecfe1cadb3747b2965a260ca",
              "versionType": "git"
            },
            {
              "lessThan": "a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112",
              "status": "affected",
              "version": "966ceafc7a437105ecfe1cadb3747b2965a260ca",
              "versionType": "git"
            },
            {
              "lessThan": "4707344b0d36d1012c8a1716e20167cd3afdd5f1",
              "status": "affected",
              "version": "966ceafc7a437105ecfe1cadb3747b2965a260ca",
              "versionType": "git"
            },
            {
              "lessThan": "0a5213bbff62b51c7d4999ac8c7e11ea57d00d45",
              "status": "affected",
              "version": "966ceafc7a437105ecfe1cadb3747b2965a260ca",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/libxfs/xfs_exchmaps.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-64357",
  "lastModified": "2026-07-25T10:17:18.150",
  "metrics": {},
  "published": "2026-07-25T10:17:18.150",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0a5213bbff62b51c7d4999ac8c7e11ea57d00d45"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4707344b0d36d1012c8a1716e20167cd3afdd5f1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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