CVE-2025-39759

{"id": "CVE-2025-39759", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.0, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.0}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "e685da14af6b31e4b336a110cb1bae1afc268be8", "lessThan": "7cda0fdde5d9890976861421d207870500f9aace", "versionType": "git"}, {"status": "affected", "version": "e685da14af6b31e4b336a110cb1bae1afc268be8", "lessThan": "b172535ccba12f0cf7d23b3b840989de47fc104d", "versionType": "git"}, {"status": "affected", "version": "e685da14af6b31e4b336a110cb1bae1afc268be8", "lessThan": "dd0b28d877b293b1d7f8727a7de08ae36b6b9ef0", "versionType": "git"}, {"status": "affected", "version": "e685da14af6b31e4b336a110cb1bae1afc268be8", "lessThan": "c38028ce0d0045ca600b6a8345a0ff92bfb47b66", "versionType": "git"}, {"status": "affected", "version": "e685da14af6b31e4b336a110cb1bae1afc268be8", "lessThan": "2fd0f5ceb997f90f4332ccbab6c7e907e6b2d0eb", "versionType": "git"}, {"status": "affected", "version": "e685da14af6b31e4b336a110cb1bae1afc268be8", "lessThan": "e1249667750399a48cafcf5945761d39fa584edf", "versionType": "git"}], "programFiles": ["fs/btrfs/qgroup.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.12"}, {"status": "unaffected", "version": "0", "lessThan": "3.12", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.149", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.103", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.44", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.15.11", "versionType": "semver", "lessThanOrEqual": "6.15.*"}, {"status": "unaffected", "version": "6.16.2", "versionType": "semver", "lessThanOrEqual": "6.16.*"}, {"status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/btrfs/qgroup.c"], "defaultStatus": "affected"}]}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "affectedData": [{"vendor": "Siemens", "product": "SIMATIC CN 4100", "versions": [{"status": "affected", "version": "0", "lessThan": "V5.0", "versionType": "custom"}], "defaultStatus": "unknown"}]}], "published": "2025-09-11T17:15:39.827", "references": [{"url": "https://git.kernel.org/stable/c/2fd0f5ceb997f90f4332ccbab6c7e907e6b2d0eb", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7cda0fdde5d9890976861421d207870500f9aace", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b172535ccba12f0cf7d23b3b840989de47fc104d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c38028ce0d0045ca600b6a8345a0ff92bfb47b66", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/dd0b28d877b293b1d7f8727a7de08ae36b6b9ef0", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e1249667750399a48cafcf5945761d39fa584edf", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html", "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-362"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: qgroup: fix race between quota disable and quota rescan ioctl\n\nThere's a race between a task disabling quotas and another running the\nrescan ioctl that can result in a use-after-free of qgroup records from\nthe fs_info->qgroup_tree rbtree.\n\nThis happens as follows:\n\n1) Task A enters btrfs_ioctl_quota_rescan() -> btrfs_qgroup_rescan();\n\n2) Task B enters btrfs_quota_disable() and calls\n btrfs_qgroup_wait_for_completion(), which does nothing because at that\n point fs_info->qgroup_rescan_running is false (it wasn't set yet by\n task A);\n\n3) Task B calls btrfs_free_qgroup_config() which starts freeing qgroups\n from fs_info->qgroup_tree without taking the lock fs_info->qgroup_lock;\n\n4) Task A enters qgroup_rescan_zero_tracking() which starts iterating\n the fs_info->qgroup_tree tree while holding fs_info->qgroup_lock,\n but task B is freeing qgroup records from that tree without holding\n the lock, resulting in a use-after-free.\n\nFix this by taking fs_info->qgroup_lock at btrfs_free_qgroup_config().\nAlso at btrfs_qgroup_rescan() don't start the rescan worker if quotas\nwere already disabled."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbtrfs: qgroup: solucionar condici\u00f3n de carrera entre la desactivaci\u00f3n de cuotas y el ioctl de reescaneo de cuotas\n\nExiste una condici\u00f3n de carrera entre una tarea que desactiva las cuotas y otra que ejecuta el ioctl de reescaneo que puede resultar en un uso despu\u00e9s de liberaci\u00f3n de registros de qgroup del rbtree fs_info->qgroup_tree.\n\nEsto ocurre de la siguiente manera:\n\n1) La Tarea A entra en btrfs_ioctl_quota_rescan() -> btrfs_qgroup_rescan();\n\n2) La Tarea B entra en btrfs_quota_disable() y llama a btrfs_qgroup_wait_for_completion(), lo cual no hace nada porque en ese momento fs_info->qgroup_rescan_running es falso (a\u00fan no hab\u00eda sido establecido por la Tarea A);\n\n3) La Tarea B llama a btrfs_free_qgroup_config() que comienza a liberar qgroups del fs_info->qgroup_tree sin tomar el bloqueo fs_info->qgroup_lock;\n\n4) La Tarea A entra en qgroup_rescan_zero_tracking() que comienza a iterar el \u00e1rbol fs_info->qgroup_tree mientras mantiene el fs_info->qgroup_lock, pero la Tarea B est\u00e1 liberando registros de qgroup de ese \u00e1rbol sin mantener el bloqueo, resultando en un uso despu\u00e9s de liberaci\u00f3n.\n\nSolucione esto tomando fs_info->qgroup_lock en btrfs_free_qgroup_config(). Tambi\u00e9n en btrfs_qgroup_rescan() no inicie el trabajador de reescaneo si las cuotas ya estaban desactivadas."}], "lastModified": "2026-10-19T21:10:00.160", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6677CEA1-1ADF-4F1C-8535-BD914C74135D", "versionEndExcluding": "6.1.149", "versionStartIncluding": "3.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F2293654-7169-49B5-8D0D-EE51EF8B8E48", "versionEndExcluding": "6.6.103", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "12351F24-1133-4775-960C-F2B47E81298B", "versionEndExcluding": "6.12.44", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BC242347-F722-43AE-B910-BE0B22386977", "versionEndExcluding": "6.15.11", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BD7C087D-2415-4521-B624-30003352F899", "versionEndExcluding": "6.16.2", "versionStartIncluding": "6.16"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}