Vulnerability-Lookup

GHSA-CGX7-Q95Q-MHC8

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64357"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:18Z",
    "severity": null
  },
  "details": "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": "GHSA-cgx7-q95q-mhc8",
  "modified": "2026-07-25T12:31:32Z",
  "published": "2026-07-25T12:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64357"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a5213bbff62b51c7d4999ac8c7e11ea57d00d45"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4707344b0d36d1012c8a1716e20167cd3afdd5f1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64357 (GCVE-0-2026-64357)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50

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.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/c597c8580d50127fc…
https://git.kernel.org/stable/c/a62ef2d13d6e7270d…
https://git.kernel.org/stable/c/4707344b0d36d1012…
https://git.kernel.org/stable/c/0a5213bbff62b51c7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 966ceafc7a437105ecfe1cadb3747b2965a260ca , < c597c8580d50127fc1221b5a5b653a94d49e23e3 (git) Affected: 966ceafc7a437105ecfe1cadb3747b2965a260ca , < a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112 (git) Affected: 966ceafc7a437105ecfe1cadb3747b2965a260ca , < 4707344b0d36d1012c8a1716e20167cd3afdd5f1 (git) Affected: 966ceafc7a437105ecfe1cadb3747b2965a260ca , < 0a5213bbff62b51c7d4999ac8c7e11ea57d00d45 (git)
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "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",
          "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.96",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2-rc1",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "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": "2026-07-25T08:50:14.676Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3"
        },
        {
          "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": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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": "2026-07-25T08:50:14.676Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

GHSA-CGX7-Q95Q-MHC8

CVE-2026-64357 (GCVE-0-2026-64357)

Tags

Sightings

Nomenclature