{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-18T07:33:45.930","vulnerabilities":[{"cve":{"id":"CVE-2024-46701","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2024-09-13T07:15:05.127","lastModified":"2024-09-19T13:40:27.817","vulnStatus":"Analyzed","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 Después de cambiar las operaciones de directorio tmpfs de simple_dir_operations a simple_offset_dir_operations, cada cambio de nombre que se produzca llenará new dentry en el árbol 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 provocará una combinación 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 continuación). 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 condición) Elegimos la misma lógica 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 índice >= last_index. El file->private_data que ahora se usa en el directorio de desplazamiento se puede usar directamente para hacer esto, y también actualizamos el last_index cuando buscamos el archivo dir. [brauner: solo actualizamos last_index después de la búsqueda cuando el desplazamiento es cero como sugirió Jan]"}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-835"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.10.7","matchCriteriaId":"FC206D9C-CA64-401C-AA0C-3DC0DA769B2D"},{"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"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/308b4fc2403b335894592ee9dc212a5e58bb309f","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/64a7ce76fb901bf9f9c36cf5d681328fc0fd4b5a","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]}]}}]}