Vulnerability-Lookup

FKIE_CVE-2026-64256

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-08-17 05:17

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/249e311c2ba392ceaf9ebfc145a46922946f069a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2b14fe1e0924c6b901f4256456342569c5397abe	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d1c4c40599c376aeb0c93068a2ae344e79ee4b90	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d766e4e5e85d829629c3ba503802fe1303d7b591	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.2
linux	linux_kernel	7.2
linux	linux_kernel	7.2

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/scrub/dqiterate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
              "version": "21d7500929c8a0b10e22a6755850c6f9a9280284",
              "versionType": "git"
            },
            {
              "lessThan": "d1c4c40599c376aeb0c93068a2ae344e79ee4b90",
              "status": "affected",
              "version": "21d7500929c8a0b10e22a6755850c6f9a9280284",
              "versionType": "git"
            },
            {
              "lessThan": "2b14fe1e0924c6b901f4256456342569c5397abe",
              "status": "affected",
              "version": "21d7500929c8a0b10e22a6755850c6f9a9280284",
              "versionType": "git"
            },
            {
              "lessThan": "d766e4e5e85d829629c3ba503802fe1303d7b591",
              "status": "affected",
              "version": "21d7500929c8a0b10e22a6755850c6f9a9280284",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/scrub/dqiterate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E97CF8C4-8024-4996-ADD8-35BAE38BC68B",
              "versionEndExcluding": "6.12.96",
              "versionStartIncluding": "6.8",
              "vulnerable": true
            },
            {
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: don\u0027t wrap around quota ids in dqiterate\n\nLOLLM noticed that q_id is an unsigned 32-bit variable.  If it happens\nto be set to XFS_DQ_ID_MAX due to a filesystem that actually has a dquot\nfor ID_MAX, then this addition will truncate to zero and the iteration\nstarts over.  Fix this by casting to u64."
    }
  ],
  "id": "CVE-2026-64256",
  "lastModified": "2026-08-17T05:17:24.207",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-07-25T10:17:04.630",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/249e311c2ba392ceaf9ebfc145a46922946f069a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/2b14fe1e0924c6b901f4256456342569c5397abe"
    },
    {
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    },
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/d766e4e5e85d829629c3ba503802fe1303d7b591"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-64256 (GCVE-0-2026-64256)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-08-17 04:52

Title

xfs: don't wrap around quota ids in dqiterate

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/249e311c2ba392cea…
https://git.kernel.org/stable/c/d1c4c40599c376aeb…
https://git.kernel.org/stable/c/2b14fe1e0924c6b90…
https://git.kernel.org/stable/c/d766e4e5e85d82962…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 21d7500929c8a0b10e22a6755850c6f9a9280284 , < 249e311c2ba392ceaf9ebfc145a46922946f069a (git) Affected: 21d7500929c8a0b10e22a6755850c6f9a9280284 , < d1c4c40599c376aeb0c93068a2ae344e79ee4b90 (git) Affected: 21d7500929c8a0b10e22a6755850c6f9a9280284 , < 2b14fe1e0924c6b901f4256456342569c5397abe (git) Affected: 21d7500929c8a0b10e22a6755850c6f9a9280284 , < d766e4e5e85d829629c3ba503802fe1303d7b591 (git)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (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 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/scrub/dqiterate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "249e311c2ba392ceaf9ebfc145a46922946f069a",
              "status": "affected",
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            },
            {
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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            },
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              "versionType": "semver"
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}

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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FKIE_CVE-2026-64256

CVE-2026-64256 (GCVE-0-2026-64256)

Tags

Sightings

Nomenclature