Vulnerability-Lookup

FKIE_CVE-2025-68761

Vulnerability from fkie_nvd - Published: 2026-01-05 10:15 - Updated: 2026-10-14 16:10

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: hfs: fix potential use after free in hfs_correct_next_unused_CNID() This code calls hfs_bnode_put(node) which drops the refcount and then dreferences "node" on the next line. It's only safe to use "node" when we're holding a reference so flip these two lines around.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/40a1e0142096dd7dd6cb5373841222b528698588
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c105e76bb17cf4b55fe89c6ad4f6a0e3972b5b08

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/hfs/catalog.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "40a1e0142096dd7dd6cb5373841222b528698588",
              "status": "affected",
              "version": "a06ec283e125e334155fe13005c76c9f484ce759",
              "versionType": "git"
            },
            {
              "lessThan": "c105e76bb17cf4b55fe89c6ad4f6a0e3972b5b08",
              "status": "affected",
              "version": "a06ec283e125e334155fe13005c76c9f484ce759",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/hfs/catalog.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": "6.18.*",
              "status": "unaffected",
              "version": "6.18.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfs: fix potential use after free in hfs_correct_next_unused_CNID()\n\nThis code calls hfs_bnode_put(node) which drops the refcount and then\ndreferences \"node\" on the next line.  It\u0027s only safe to use \"node\"\nwhen we\u0027re holding a reference so flip these two lines around."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nhfs: correcci\u00f3n de posible uso despu\u00e9s de liberar en hfs_correct_next_unused_CNID()\n\nEste c\u00f3digo llama a hfs_bnode_put(node) lo que decrementa el contador de referencias y luego desreferencia \u0027node\u0027 en la siguiente l\u00ednea. Solo es seguro usar \u0027node\u0027 cuando mantenemos una referencia, as\u00ed que invierta estas dos l\u00edneas."
    }
  ],
  "id": "CVE-2025-68761",
  "lastModified": "2026-10-14T16:10:00.250",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-05T10:15:57.240",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/40a1e0142096dd7dd6cb5373841222b528698588"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c105e76bb17cf4b55fe89c6ad4f6a0e3972b5b08"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}

CVE-2025-68761 (GCVE-0-2025-68761)

Vulnerability from cvelistv5 – Published: 2026-01-05 09:32 – Updated: 2026-08-05 12:11

Title

hfs: fix potential use after free in hfs_correct_next_unused_CNID()

Summary

Severity

7.8 (High)


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

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7018 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/40a1e0142096dd7dd…
https://git.kernel.org/stable/c/c105e76bb17cf4b55…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a06ec283e125e334155fe13005c76c9f484ce759 , < 40a1e0142096dd7dd6cb5373841222b528698588 (git) Affected: a06ec283e125e334155fe13005c76c9f484ce759 , < c105e76bb17cf4b55fe89c6ad4f6a0e3972b5b08 (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.2 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/hfs/catalog.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "40a1e0142096dd7dd6cb5373841222b528698588",
              "status": "affected",
              "version": "a06ec283e125e334155fe13005c76c9f484ce759",
              "versionType": "git"
            },
            {
              "lessThan": "c105e76bb17cf4b55fe89c6ad4f6a0e3972b5b08",
              "status": "affected",
              "version": "a06ec283e125e334155fe13005c76c9f484ce759",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/hfs/catalog.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": "6.18.*",
              "status": "unaffected",
              "version": "6.18.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.2",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19",
                  "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: fix potential use after free in hfs_correct_next_unused_CNID()\n\nThis code calls hfs_bnode_put(node) which drops the refcount and then\ndreferences \"node\" on the next line.  It\u0027s only safe to use \"node\"\nwhen we\u0027re holding a reference so flip these two lines around."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached locally through unlink, rmdir, or an overwriting rename on a writable, already-mounted HFS filesystem.\nAC:L - An attacker can create thread-only catalog tail nodes, repeatedly delete the highest-CNID object, induce reclaim pressure, and heap-spray the freed node; no condition fundamentally outside attacker control is required.\nPR:L - Mounting HFS requires CAP_SYS_ADMIN in the initial user namespace, but an ordinary user with write and search permission on an existing HFS directory can trigger the vulnerable deletion path.\nUI:N - The attacker directly invokes the filesystem operations, requiring no action by another user once a writable HFS volume is available.\nS:U - Exploitation compromises the host kernel within the same security authority and does not inherently cross a virtualization or comparable isolation boundary.\nC:H - Reclaim and heap spraying can replace the freed B-tree node, after which attacker-controlled tree and page fields may be dereferenced, supporting kernel-memory disclosure.\nI:H - The use-after-free can progress beyond the initial stale prev read into reuse of attacker-sprayed pointer, refcount, and lock fields, supporting arbitrary memory modification or control-flow hijacking.\nA:H - Dereferencing a reclaimed node can cause a kernel oops or panic, while a manipulated traversal can also loop or corrupt critical HFS state."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:11:21.089Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/40a1e0142096dd7dd6cb5373841222b528698588"
        },
        {
          "url": "https://git.kernel.org/stable/c/c105e76bb17cf4b55fe89c6ad4f6a0e3972b5b08"
        }
      ],
      "title": "hfs: fix potential use after free in hfs_correct_next_unused_CNID()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68761",
    "datePublished": "2026-01-05T09:32:33.814Z",
    "dateReserved": "2025-12-24T10:30:51.034Z",
    "dateUpdated": "2026-08-05T12:11:21.089Z",
    "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.

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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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