Vulnerability-Lookup

GHSA-G4P6-4X9W-QFQ5

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-08 21:31

Details

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

hfs: Replace BUG_ON with error handling for CNID count checks

In a06ec283e125 next_id, folder_count, and file_count in the super block info were expanded to 64 bits, and BUG_ONs were added to detect overflow. This triggered an error reported by syzbot: if the MDB is corrupted, the BUG_ON is triggered. This patch replaces this mechanism with proper error handling and resolves the syzbot reported bug.

Singed-off-by: Jori Koolstra jkoolstra@xs4all.nl

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-2026-43228"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-617"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T12:16:42Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfs: Replace BUG_ON with error handling for CNID count checks\n\nIn a06ec283e125 next_id, folder_count, and file_count in the super block\ninfo were expanded to 64 bits, and BUG_ONs were added to detect\noverflow. This triggered an error reported by syzbot: if the MDB is\ncorrupted, the BUG_ON is triggered. This patch replaces this mechanism\nwith proper error handling and resolves the syzbot reported bug.\n\nSinged-off-by: Jori Koolstra \u003cjkoolstra@xs4all.nl\u003e",
  "id": "GHSA-g4p6-4x9w-qfq5",
  "modified": "2026-05-08T21:31:20Z",
  "published": "2026-05-06T12:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43228"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b226804532a875c10276168dc55ce752944096bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6536c1ced315fa645576d3a39c6e07f2a472962"
    }
  ],
  "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-2026-43228 (GCVE-0-2026-43228)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-05-11 22:20

Title

hfs: Replace BUG_ON with error handling for CNID count checks

Summary

In the Linux kernel, the following vulnerability has been resolved: hfs: Replace BUG_ON with error handling for CNID count checks In a06ec283e125 next_id, folder_count, and file_count in the super block info were expanded to 64 bits, and BUG_ONs were added to detect overflow. This triggered an error reported by syzbot: if the MDB is corrupted, the BUG_ON is triggered. This patch replaces this mechanism with proper error handling and resolves the syzbot reported bug. Singed-off-by: Jori Koolstra <jkoolstra@xs4all.nl>

Severity ?

No CVSS data available.

Assigner

Linux

References

2 references

URL	Tags
https://git.kernel.org/stable/c/b6536c1ced315fa64…
https://git.kernel.org/stable/c/b226804532a875c10…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a06ec283e125e334155fe13005c76c9f484ce759 , < b6536c1ced315fa645576d3a39c6e07f2a472962 (git) Affected: a06ec283e125e334155fe13005c76c9f484ce759 , < b226804532a875c10276168dc55ce752944096bd (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.19.6 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/hfs/dir.c",
            "fs/hfs/hfs_fs.h",
            "fs/hfs/inode.c",
            "fs/hfs/mdb.c",
            "fs/hfs/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b6536c1ced315fa645576d3a39c6e07f2a472962",
              "status": "affected",
              "version": "a06ec283e125e334155fe13005c76c9f484ce759",
              "versionType": "git"
            },
            {
              "lessThan": "b226804532a875c10276168dc55ce752944096bd",
              "status": "affected",
              "version": "a06ec283e125e334155fe13005c76c9f484ce759",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/hfs/dir.c",
            "fs/hfs/hfs_fs.h",
            "fs/hfs/inode.c",
            "fs/hfs/mdb.c",
            "fs/hfs/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "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": "6.19.6",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfs: Replace BUG_ON with error handling for CNID count checks\n\nIn a06ec283e125 next_id, folder_count, and file_count in the super block\ninfo were expanded to 64 bits, and BUG_ONs were added to detect\noverflow. This triggered an error reported by syzbot: if the MDB is\ncorrupted, the BUG_ON is triggered. This patch replaces this mechanism\nwith proper error handling and resolves the syzbot reported bug.\n\nSinged-off-by: Jori Koolstra \u003cjkoolstra@xs4all.nl\u003e"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:20:28.976Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b6536c1ced315fa645576d3a39c6e07f2a472962"
        },
        {
          "url": "https://git.kernel.org/stable/c/b226804532a875c10276168dc55ce752944096bd"
        }
      ],
      "title": "hfs: Replace BUG_ON with error handling for CNID count checks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43228",
    "datePublished": "2026-05-06T11:28:26.292Z",
    "dateReserved": "2026-05-01T14:12:55.994Z",
    "dateUpdated": "2026-05-11T22:20:28.976Z",
    "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-G4P6-4X9W-QFQ5

CVE-2026-43228 (GCVE-0-2026-43228)

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Sightings

Nomenclature