{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-68761",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-12-24T10:30:51.034Z",
        "datePublished": "2026-01-05T09:32:33.814Z",
        "dateUpdated": "2026-08-05T12:11:21.089Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:11:21.089Z"
            },
            "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's only safe to use \"node\"\nwhen we're holding a reference so flip these two lines around."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "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."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/hfs/catalog.c"
                    ],
                    "versions": [
                        {
                            "version": "a06ec283e125e334155fe13005c76c9f484ce759",
                            "lessThan": "40a1e0142096dd7dd6cb5373841222b528698588",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a06ec283e125e334155fe13005c76c9f484ce759",
                            "lessThan": "c105e76bb17cf4b55fe89c6ad4f6a0e3972b5b08",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/hfs/catalog.c"
                    ],
                    "versions": [
                        {
                            "version": "6.18",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.18",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.2",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18",
                                    "versionEndExcluding": "6.18.2"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18",
                                    "versionEndExcluding": "6.19"
                                }
                            ]
                        }
                    ]
                }
            ],
            "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"
            }
        }
    }
}