Vulnerability-Lookup

GHSA-V4F5-4J9W-9F24

Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-04-27 21:30

Details

In the Linux kernel, the following vulnerability has been resolved:

xfs: scrub: unlock dquot before early return in quota scrub

xchk_quota_item can return early after calling xchk_fblock_process_error. When that helper returns false, the function returned immediately without dropping dq->q_qlock, which can leave the dquot lock held and risk lock leaks or deadlocks in later quota operations.

Fix this by unlocking dq->q_qlock before the early return.

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31556"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T15:16:29Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: scrub: unlock dquot before early return in quota scrub\n\nxchk_quota_item can return early after calling xchk_fblock_process_error.\nWhen that helper returns false, the function returned immediately without\ndropping dq-\u003eq_qlock, which can leave the dquot lock held and risk lock\nleaks or deadlocks in later quota operations.\n\nFix this by unlocking dq-\u003eq_qlock before the early return.",
  "id": "GHSA-v4f5-4j9w-9f24",
  "modified": "2026-04-27T21:30:47Z",
  "published": "2026-04-24T15:32:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31556"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/268378b6ad20569af0d1957992de1c8b16c6e900"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b0c3414b308e6822cda90bf99f7eac94d4cca2b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e822f535273af0e8968eab7acc0cea0b90dd25af"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-31556 (GCVE-0-2026-31556)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:35 – Updated: 2026-05-11 22:11

Title

xfs: scrub: unlock dquot before early return in quota scrub

Summary

In the Linux kernel, the following vulnerability has been resolved: xfs: scrub: unlock dquot before early return in quota scrub xchk_quota_item can return early after calling xchk_fblock_process_error. When that helper returns false, the function returned immediately without dropping dq->q_qlock, which can leave the dquot lock held and risk lock leaks or deadlocks in later quota operations. Fix this by unlocking dq->q_qlock before the early return.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/e822f535273af0e89…
https://git.kernel.org/stable/c/3b0c3414b308e6822…
https://git.kernel.org/stable/c/d128fc0c5c2b19224…
https://git.kernel.org/stable/c/268378b6ad20569af…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7d1f0e167a067ed741dec08b7614d76893422b04 , < e822f535273af0e8968eab7acc0cea0b90dd25af (git) Affected: 7d1f0e167a067ed741dec08b7614d76893422b04 , < 3b0c3414b308e6822cda90bf99f7eac94d4cca2b (git) Affected: 7d1f0e167a067ed741dec08b7614d76893422b04 , < d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f (git) Affected: 7d1f0e167a067ed741dec08b7614d76893422b04 , < 268378b6ad20569af0d1957992de1c8b16c6e900 (git)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 6.12.80 , ≤ 6.12.* (semver) Unaffected: 6.18.21 , ≤ 6.18.* (semver) Unaffected: 6.19.11 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/scrub/quota.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e822f535273af0e8968eab7acc0cea0b90dd25af",
              "status": "affected",
              "version": "7d1f0e167a067ed741dec08b7614d76893422b04",
              "versionType": "git"
            },
            {
              "lessThan": "3b0c3414b308e6822cda90bf99f7eac94d4cca2b",
              "status": "affected",
              "version": "7d1f0e167a067ed741dec08b7614d76893422b04",
              "versionType": "git"
            },
            {
              "lessThan": "d128fc0c5c2b19224927d4fd2a46c2fe6a1f606f",
              "status": "affected",
              "version": "7d1f0e167a067ed741dec08b7614d76893422b04",
              "versionType": "git"
            },
            {
              "lessThan": "268378b6ad20569af0d1957992de1c8b16c6e900",
              "status": "affected",
              "version": "7d1f0e167a067ed741dec08b7614d76893422b04",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/scrub/quota.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": "6.12.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.80",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.8",
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                },
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                  "vulnerable": true
                }
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              "negate": false,
              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: scrub: unlock dquot before early return in quota scrub\n\nxchk_quota_item can return early after calling xchk_fblock_process_error.\nWhen that helper returns false, the function returned immediately without\ndropping dq-\u003eq_qlock, which can leave the dquot lock held and risk lock\nleaks or deadlocks in later quota operations.\n\nFix this by unlocking dq-\u003eq_qlock before the early return."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:11:04.289Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
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          "url": "https://git.kernel.org/stable/c/268378b6ad20569af0d1957992de1c8b16c6e900"
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      ],
      "title": "xfs: scrub: unlock dquot before early return in quota scrub",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31556",
    "datePublished": "2026-04-24T14:35:39.880Z",
    "dateReserved": "2026-03-09T15:48:24.115Z",
    "dateUpdated": "2026-05-11T22:11:04.289Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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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GHSA-V4F5-4J9W-9F24

CVE-2026-31556 (GCVE-0-2026-31556)

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