CVE-2025-68761

{"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"}}}}

{}

{"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's only safe to use \"node\"\nwhen we're 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 'node' en la siguiente l\u00ednea. Solo es seguro usar 'node' 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"}

{"bugzilla": {"description": "kernel: hfs: fix potential use after free in hfs_correct_next_unused_CNID()", "id": "2427115", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2427115"}, "csaw": false, "details": ["No description is available for this CVE."], "name": "CVE-2025-68761", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-68761\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-68761\nhttps://lore.kernel.org/linux-cve-announce/2026010551-CVE-2025-68761-7f01@gregkh/T"]}

{}