{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-46701", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-09-11T15:12:18.251Z", "datePublished": "2024-09-13T06:27:29.911Z", "dateUpdated": "2026-05-11T20:34:42.996Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:34:42.996Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibfs: fix infinite directory reads for offset dir\n\nAfter we switch tmpfs dir operations from simple_dir_operations to\nsimple_offset_dir_operations, every rename happened will fill new dentry\nto dest dir's maple tree(&SHMEM_I(inode)->dir_offsets->mt) with a free\nkey starting with octx->newx_offset, and then set newx_offset equals to\nfree key + 1. This will lead to infinite readdir combine with rename\nhappened at the same time, which fail generic/736 in xfstests(detail show\nas below).\n\n1. create 5000 files(1 2 3...) under one dir\n2. call readdir(man 3 readdir) once, and get one entry\n3. rename(entry, \"TEMPFILE\"), then rename(\"TEMPFILE\", entry)\n4. loop 2~3, until readdir return nothing or we loop too many\n times(tmpfs break test with the second condition)\n\nWe choose the same logic what commit 9b378f6ad48cf (\"btrfs: fix infinite\ndirectory reads\") to fix it, record the last_index when we open dir, and\ndo not emit the entry which index >= last_index. The file->private_data\nnow used in offset dir can use directly to do this, and we also update\nthe last_index when we llseek the dir file.\n\n[brauner: only update last_index after seek when offset is zero like Jan suggested]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/libfs.c"], "versions": [{"version": "a2e459555c5f9da3e619b7e47a63f98574dc75f1", "lessThan": "308b4fc2403b335894592ee9dc212a5e58bb309f", "status": "affected", "versionType": "git"}, {"version": "a2e459555c5f9da3e619b7e47a63f98574dc75f1", "lessThan": "64a7ce76fb901bf9f9c36cf5d681328fc0fd4b5a", "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/libfs.c"], "versions": [{"version": "6.6", "status": "affected"}, {"version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.7", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11", "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": "6.6", "versionEndExcluding": "6.10.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/308b4fc2403b335894592ee9dc212a5e58bb309f"}, {"url": "https://git.kernel.org/stable/c/64a7ce76fb901bf9f9c36cf5d681328fc0fd4b5a"}], "title": "libfs: fix infinite directory reads for offset dir", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-09-29T15:04:11.603675Z", "id": "CVE-2024-46701", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-29T15:04:25.862Z"}}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FC206D9C-CA64-401C-AA0C-3DC0DA769B2D", "versionEndExcluding": "6.10.7", "versionStartIncluding": "6.6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*", "matchCriteriaId": "8B3CE743-2126-47A3-8B7C-822B502CF119", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*", "matchCriteriaId": "4DEB27E7-30AA-45CC-8934-B89263EF3551", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*", "matchCriteriaId": "E0005AEF-856E-47EB-BFE4-90C46899394D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibfs: fix infinite directory reads for offset dir\n\nAfter we switch tmpfs dir operations from simple_dir_operations to\nsimple_offset_dir_operations, every rename happened will fill new dentry\nto dest dir's maple tree(&SHMEM_I(inode)->dir_offsets->mt) with a free\nkey starting with octx->newx_offset, and then set newx_offset equals to\nfree key + 1. This will lead to infinite readdir combine with rename\nhappened at the same time, which fail generic/736 in xfstests(detail show\nas below).\n\n1. create 5000 files(1 2 3...) under one dir\n2. call readdir(man 3 readdir) once, and get one entry\n3. rename(entry, \"TEMPFILE\"), then rename(\"TEMPFILE\", entry)\n4. loop 2~3, until readdir return nothing or we loop too many\n times(tmpfs break test with the second condition)\n\nWe choose the same logic what commit 9b378f6ad48cf (\"btrfs: fix infinite\ndirectory reads\") to fix it, record the last_index when we open dir, and\ndo not emit the entry which index >= last_index. The file->private_data\nnow used in offset dir can use directly to do this, and we also update\nthe last_index when we llseek the dir file.\n\n[brauner: only update last_index after seek when offset is zero like Jan suggested]"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: libfs: arregla lecturas de directorio infinitas para el directorio offset Despu\u00e9s de cambiar las operaciones de directorio tmpfs de simple_dir_operations a simple_offset_dir_operations, cada cambio de nombre que se produzca llenar\u00e1 new dentry en el \u00e1rbol de maple del directorio de destino (&SHMEM_I(inode)->dir_offsets->mt) con una clave libre que comienza con octx->newx_offset, y luego establece newx_offset igual a la clave libre + 1. Esto provocar\u00e1 una combinaci\u00f3n de lectura de directorio infinita con el cambio de nombre ocurrido al mismo tiempo, lo que falla generic/736 en xfstests (los detalles se muestran a continuaci\u00f3n). 1. crear 5000 archivos (1 2 3...) bajo un directorio 2. llamar a readdir(man 3 readdir) una vez, y obtener una entrada 3. renombrar(entrada, \"TEMPFILE\"), luego renombrar(\"TEMPFILE\", entrada) 4. repetir 2~3 veces, hasta que readdir no devuelva nada o repetimos demasiadas veces (tmpfs interrumpe la prueba con la segunda condici\u00f3n) Elegimos la misma l\u00f3gica que el commit 9b378f6ad48cf (\"btrfs: arregla lecturas infinitas de directorio\") para arreglarlo, registrar el last_index cuando abrimos el directorio, y no emitir la entrada cuyo \u00edndice >= last_index. El file->private_data que ahora se usa en el directorio de desplazamiento se puede usar directamente para hacer esto, y tambi\u00e9n actualizamos el last_index cuando buscamos el archivo dir. [brauner: solo actualizamos last_index despu\u00e9s de la b\u00fasqueda cuando el desplazamiento es cero como sugiri\u00f3 Jan]"}], "id": "CVE-2024-46701", "lastModified": "2024-09-19T13:40:27.817", "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": "2024-09-13T07:15:05.127", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/308b4fc2403b335894592ee9dc212a5e58bb309f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/64a7ce76fb901bf9f9c36cf5d681328fc0fd4b5a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-835"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: libfs: fix infinite directory reads for offset dir", "id": "2312098", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2312098"}, "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-835", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nlibfs: fix infinite directory reads for offset dir\nAfter we switch tmpfs dir operations from simple_dir_operations to\nsimple_offset_dir_operations, every rename happened will fill new dentry\nto dest dir's maple tree(&SHMEM_I(inode)->dir_offsets->mt) with a free\nkey starting with octx->newx_offset, and then set newx_offset equals to\nfree key + 1. This will lead to infinite readdir combine with rename\nhappened at the same time, which fail generic/736 in xfstests(detail show\nas below).\n1. create 5000 files(1 2 3...) under one dir\n2. call readdir(man 3 readdir) once, and get one entry\n3. rename(entry, \"TEMPFILE\"), then rename(\"TEMPFILE\", entry)\n4. loop 2~3, until readdir return nothing or we loop too many\ntimes(tmpfs break test with the second condition)\nWe choose the same logic what commit 9b378f6ad48cf (\"btrfs: fix infinite\ndirectory reads\") to fix it, record the last_index when we open dir, and\ndo not emit the entry which index >= last_index. The file->private_data\nnow used in offset dir can use directly to do this, and we also update\nthe last_index when we llseek the dir file.\n[brauner: only update last_index after seek when offset is zero like Jan suggested]"], "name": "CVE-2024-46701", "package_state": [{"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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "2024-09-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-46701\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-46701\nhttps://lore.kernel.org/linux-cve-announce/2024091326-CVE-2024-46701-ad65@gregkh/T"], "threat_severity": "Moderate"}

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