CVE-2026-23465

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23465", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.021Z", "datePublished": "2026-04-03T15:15:44.862Z", "dateUpdated": "2026-10-30T12:24:08.733Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:24:08.733Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: log new dentries when logging parent dir of a conflicting inode\n\nIf we log the parent directory of a conflicting inode, we are not logging\nthe new dentries of the directory, so when we finish we have the parent\ndirectory's inode marked as logged but we did not log its new dentries.\nAs a consequence if the parent directory is explicitly fsynced later and\nit does not have any new changes since we logged it, the fsync is a no-op\nand after a power failure the new dentries are missing.\n\nExample scenario:\n\n $ mkdir foo\n\n $ sync\n\n $rmdir foo\n\n $ mkdir dir1\n $ mkdir dir2\n\n # A file with the same name and parent as the directory we just deleted\n # and was persisted in a past transaction. So the deleted directory's\n # inode is a conflicting inode of this new file's inode.\n $ touch foo\n\n $ ln foo dir2/link\n\n # The fsync on dir2 will log the parent directory (\".\") because the\n # conflicting inode (deleted directory) does not exists anymore, but it\n # it does not log its new dentries (dir1).\n $ xfs_io -c \"fsync\" dir2\n\n # This fsync on the parent directory is no-op, since the previous fsync\n # logged it (but without logging its new dentries).\n $ xfs_io -c \"fsync\" .\n\n <power failure>\n\n # After log replay dir1 is missing.\n\nFix this by ensuring we log new dir dentries whenever we log the parent\ndirectory of a no longer existing conflicting inode.\n\nA test case for fstests will follow soon."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/tree-log.c"], "versions": [{"version": "a3baaf0d786e22fc86295fda9c58ba0dee07599f", "lessThan": "6c23595c54cfeb878e3fbbb8eb08bc5061d0c2d4", "status": "affected", "versionType": "git"}, {"version": "a3baaf0d786e22fc86295fda9c58ba0dee07599f", "lessThan": "56e72c8b02d982be775d9df025357c152383ee84", "status": "affected", "versionType": "git"}, {"version": "a3baaf0d786e22fc86295fda9c58ba0dee07599f", "lessThan": "f556b1e09d054e31f464c0fd37280c2b5a393fee", "status": "affected", "versionType": "git"}, {"version": "a3baaf0d786e22fc86295fda9c58ba0dee07599f", "lessThan": "1cf30c73602c69d750c9345c47f2c0e9d0cfb578", "status": "affected", "versionType": "git"}, {"version": "a3baaf0d786e22fc86295fda9c58ba0dee07599f", "lessThan": "6f5a51969b1deb79aefd2194b48fe7e78e72ff7e", "status": "affected", "versionType": "git"}, {"version": "a3baaf0d786e22fc86295fda9c58ba0dee07599f", "lessThan": "9573a365ff9ff45da9222d3fe63695ce562beb24", "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/btrfs/tree-log.c"], "versions": [{"version": "5.1", "status": "affected"}, {"version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.20", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.10", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "5.1", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.6.130"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.12.78"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.18.20"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.19.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6c23595c54cfeb878e3fbbb8eb08bc5061d0c2d4"}, {"url": "https://git.kernel.org/stable/c/56e72c8b02d982be775d9df025357c152383ee84"}, {"url": "https://git.kernel.org/stable/c/f556b1e09d054e31f464c0fd37280c2b5a393fee"}, {"url": "https://git.kernel.org/stable/c/1cf30c73602c69d750c9345c47f2c0e9d0cfb578"}, {"url": "https://git.kernel.org/stable/c/6f5a51969b1deb79aefd2194b48fe7e78e72ff7e"}, {"url": "https://git.kernel.org/stable/c/9573a365ff9ff45da9222d3fe63695ce562beb24"}], "title": "btrfs: log new dentries when logging parent dir of a conflicting inode", "x_generator": {"engine": "bippy-1.2.0"}}}}

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So the deleted directory's\n # inode is a conflicting inode of this new file's inode.\n $ touch foo\n\n $ ln foo dir2/link\n\n # The fsync on dir2 will log the parent directory (\".\") because the\n # conflicting inode (deleted directory) does not exists anymore, but it\n # it does not log its new dentries (dir1).\n $ xfs_io -c \"fsync\" dir2\n\n # This fsync on the parent directory is no-op, since the previous fsync\n # logged it (but without logging its new dentries).\n $ xfs_io -c \"fsync\" .\n\n <power failure>\n\n # After log replay dir1 is missing.\n\nFix this by ensuring we log new dir dentries whenever we log the parent\ndirectory of a no longer existing conflicting inode.\n\nA test case for fstests will follow soon."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbtrfs: registrar nuevas entradas de directorio (dentries) al registrar el directorio padre de un inodo en conflicto\n\nSi registramos el directorio padre de un inodo en conflicto, no estamos registrando las nuevas entradas de directorio (dentries) del directorio, as\u00ed que cuando terminamos tenemos el inodo del directorio padre marcado como registrado pero no registramos sus nuevas entradas de directorio (dentries). Como consecuencia, si el directorio padre se sincroniza expl\u00edcitamente (fsynced) m\u00e1s tarde y no tiene ning\u00fan cambio nuevo desde que lo registramos, el fsync es una operaci\u00f3n nula (no-op) y despu\u00e9s de un fallo de alimentaci\u00f3n las nuevas entradas de directorio (dentries) faltan.\n\nEscenario de ejemplo:\n\n $ mkdir foo\n\n $ sync\n\n $rmdir foo\n\n $ mkdir dir1\n $ mkdir dir2\n\n # Un archivo con el mismo nombre y padre que el directorio que acabamos de eliminar\n # y fue persistido en una transacci\u00f3n anterior. As\u00ed que el inodo del directorio eliminado\n # es un inodo en conflicto del inodo de este nuevo archivo.\n $ touch foo\n\n $ ln foo dir2/link\n\n # El fsync en dir2 registrar\u00e1 el directorio padre ('.') porque el\n # inodo en conflicto (directorio eliminado) ya no existe, pero\n # no registra sus nuevas entradas de directorio (dentries) (dir1).\n $ xfs_io -c 'fsync' dir2\n\n # Este fsync en el directorio padre es una operaci\u00f3n nula (no-op), ya que el fsync anterior\n # lo registr\u00f3 (pero sin registrar sus nuevas entradas de directorio (dentries)).\n $ xfs_io -c 'fsync' .\n\n <fallo de alimentaci\u00f3n>\n\n # Despu\u00e9s de la reproducci\u00f3n del registro, dir1 falta.\n\nSolucione esto asegurando que registramos nuevas entradas de directorio (dentries) cada vez que registramos el directorio padre de un inodo en conflicto que ya no existe.\n\nUn caso de prueba para fstests seguir\u00e1 pronto."}], "id": "CVE-2026-23465", "lastModified": "2026-10-30T13:18:38.753", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-04-03T16:16:33.850", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1cf30c73602c69d750c9345c47f2c0e9d0cfb578"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/56e72c8b02d982be775d9df025357c152383ee84"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6c23595c54cfeb878e3fbbb8eb08bc5061d0c2d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f5a51969b1deb79aefd2194b48fe7e78e72ff7e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9573a365ff9ff45da9222d3fe63695ce562beb24"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f556b1e09d054e31f464c0fd37280c2b5a393fee"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: btrfs: log new dentries when logging parent dir of a conflicting inode", "id": "2454846", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454846"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-821", "details": ["A flaw was found in the Linux kernel's btrfs filesystem. This vulnerability occurs when the system attempts to log the parent directory of a conflicting inode, failing to properly record new directory entries. Consequently, if a power failure happens after a file system synchronization (fsync) operation, these new directory entries may be lost, leading to data loss or directory corruption."], "name": "CVE-2026-23465", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "2026-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23465\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23465\nhttps://lore.kernel.org/linux-cve-announce/2026040320-CVE-2026-23465-9c96@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a3baaf0d786e22fc86295fda9c58ba0dee07599f,56e72c8b02d982be775d9df025357c152383ee84)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a3baaf0d786e22fc86295fda9c58ba0dee07599f,f556b1e09d054e31f464c0fd37280c2b5a393fee)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a3baaf0d786e22fc86295fda9c58ba0dee07599f,1cf30c73602c69d750c9345c47f2c0e9d0cfb578)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a3baaf0d786e22fc86295fda9c58ba0dee07599f,6f5a51969b1deb79aefd2194b48fe7e78e72ff7e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a3baaf0d786e22fc86295fda9c58ba0dee07599f,9573a365ff9ff45da9222d3fe63695ce562beb24)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.130,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.78,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.20,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.10,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-04-03T21:13:33.663246+00:00", "updated": "2026-05-20T17:00:14.336979+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}