Vulnerability-Lookup

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

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

Title

xfs: don't wrap around quota ids in dqiterate

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.

Severity

No CVSS data available.

Assigner

Linux

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-rc4 , ≤ * (original_commit_for_fix)

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    "cveId": "CVE-2026-64256",
    "datePublished": "2026-07-25T08:49:08.676Z",
    "dateReserved": "2026-07-19T15:36:31.773Z",
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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:47:11Z",
      "cve": "CVE-2026-64256",
      "id": "CVE-2026-64256",
      "initial_release_date": "2026-07-25T16:47:11Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64256",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64256.json",
      "version": "2"
    }
  }
}

GHSA-WR2H-54M4-VP72

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: 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.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64256"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:04Z",
    "severity": null
  },
  "details": "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": "GHSA-wr2h-54m4-vp72",
  "modified": "2026-07-25T12:31:27Z",
  "published": "2026-07-25T12:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64256"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/249e311c2ba392ceaf9ebfc145a46922946f069a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b14fe1e0924c6b901f4256456342569c5397abe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1c4c40599c376aeb0c93068a2ae344e79ee4b90"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d766e4e5e85d829629c3ba503802fe1303d7b591"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

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

GHSA-WR2H-54M4-VP72

Tags

Sightings

Nomenclature