Vulnerability-Lookup

GHSA-V64F-8VQX-F88G

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-24 18:32

Details

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

erofs: unify lcn as u64 for 32-bit platforms

As sashiko reported [1], lcn was typed as unsigned long (or unsigned int sometimes), which is only 32 bits wide on 32-bit platforms, which causes (lcn << lclusterbits) to be truncated at 4 GiB.

In order to consolidate the logic, just use u64 consistently around the codebase.

[1] https://sashiko.dev/r/20260420034612.1899973-1-hsiangkao%40linux.alibaba.com

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53015"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:12Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: unify lcn as u64 for 32-bit platforms\n\nAs sashiko reported [1], `lcn` was typed as `unsigned long` (or\n`unsigned int` sometimes), which is only 32 bits wide on 32-bit\nplatforms, which causes `(lcn \u003c\u003c lclusterbits)` to be truncated\nat 4 GiB.\n\nIn order to consolidate the logic, just use `u64` consistently\naround the codebase.\n\n[1] https://sashiko.dev/r/20260420034612.1899973-1-hsiangkao%40linux.alibaba.com",
  "id": "GHSA-v64f-8vqx-f88g",
  "modified": "2026-06-24T18:32:43Z",
  "published": "2026-06-24T18:32:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53015"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d8c7edcb661812249469f4a5b62e9339118846f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4fc9b12e43a3f19a01a8fb61f7961be79de20253"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/582b0bf201157632cb5474c885989a6ebda46521"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/858e4d98a86adf34584767388deb6c9b217f70c5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-53015 (GCVE-0-2026-53015)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29

Title

erofs: unify lcn as u64 for 32-bit platforms

Summary

In the Linux kernel, the following vulnerability has been resolved: erofs: unify lcn as u64 for 32-bit platforms As sashiko reported [1], `lcn` was typed as `unsigned long` (or `unsigned int` sometimes), which is only 32 bits wide on 32-bit platforms, which causes `(lcn << lclusterbits)` to be truncated at 4 GiB. In order to consolidate the logic, just use `u64` consistently around the codebase. [1] https://sashiko.dev/r/20260420034612.1899973-1-hsiangkao%40linux.alibaba.com

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/4fc9b12e43a3f19a0…
https://git.kernel.org/stable/c/858e4d98a86adf345…
https://git.kernel.org/stable/c/582b0bf201157632c…
https://git.kernel.org/stable/c/2d8c7edcb66181224…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 152a333a589560bee002e4c96761f1b560a5793c , < 4fc9b12e43a3f19a01a8fb61f7961be79de20253 (git) Affected: 152a333a589560bee002e4c96761f1b560a5793c , < 858e4d98a86adf34584767388deb6c9b217f70c5 (git) Affected: 152a333a589560bee002e4c96761f1b560a5793c , < 582b0bf201157632cb5474c885989a6ebda46521 (git) Affected: 152a333a589560bee002e4c96761f1b560a5793c , < 2d8c7edcb661812249469f4a5b62e9339118846f (git)
Linux	Linux	Affected: 5.3 Unaffected: 0 , < 5.3 (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/zmap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4fc9b12e43a3f19a01a8fb61f7961be79de20253",
              "status": "affected",
              "version": "152a333a589560bee002e4c96761f1b560a5793c",
              "versionType": "git"
            },
            {
              "lessThan": "858e4d98a86adf34584767388deb6c9b217f70c5",
              "status": "affected",
              "version": "152a333a589560bee002e4c96761f1b560a5793c",
              "versionType": "git"
            },
            {
              "lessThan": "582b0bf201157632cb5474c885989a6ebda46521",
              "status": "affected",
              "version": "152a333a589560bee002e4c96761f1b560a5793c",
              "versionType": "git"
            },
            {
              "lessThan": "2d8c7edcb661812249469f4a5b62e9339118846f",
              "status": "affected",
              "version": "152a333a589560bee002e4c96761f1b560a5793c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/zmap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
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                },
                {
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                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: unify lcn as u64 for 32-bit platforms\n\nAs sashiko reported [1], `lcn` was typed as `unsigned long` (or\n`unsigned int` sometimes), which is only 32 bits wide on 32-bit\nplatforms, which causes `(lcn \u003c\u003c lclusterbits)` to be truncated\nat 4 GiB.\n\nIn order to consolidate the logic, just use `u64` consistently\naround the codebase.\n\n[1] https://sashiko.dev/r/20260420034612.1899973-1-hsiangkao%40linux.alibaba.com"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:29:25.396Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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        },
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          "url": "https://git.kernel.org/stable/c/858e4d98a86adf34584767388deb6c9b217f70c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/582b0bf201157632cb5474c885989a6ebda46521"
        },
        {
          "url": "https://git.kernel.org/stable/c/2d8c7edcb661812249469f4a5b62e9339118846f"
        }
      ],
      "title": "erofs: unify lcn as u64 for 32-bit platforms",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53015",
    "datePublished": "2026-06-24T16:29:25.396Z",
    "dateReserved": "2026-06-09T07:44:35.378Z",
    "dateUpdated": "2026-06-24T16:29:25.396Z",
    "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.

Action not permitted

GHSA-V64F-8VQX-F88G

CVE-2026-53015 (GCVE-0-2026-53015)

Tags

Sightings

Nomenclature