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The return value of nilfs_last_byte()\nis also of type \"unsigned int\", but it is truncated so as not to exceed\nPAGE_SIZE and no bit loss occurs, so no change is required."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nilfs2: se corrige un posible acceso a memoria fuera de los l\u00edmites en nilfs_find_entry() Syzbot inform\u00f3 que al buscar registros en un directorio donde el i_size del inodo est\u00e1 da\u00f1ado y tiene un valor grande, puede ocurrir un acceso a memoria fuera del rango de folio/p\u00e1gina, o puede detectarse un error de use-after-free si KASAN est\u00e1 habilitado. Esto se debe a que nilfs_last_byte(), que es llamado por nilfs_find_entry() y otros para calcular la cantidad de bytes v\u00e1lidos de datos de directorio en una p\u00e1gina a partir de i_size y el \u00edndice de p\u00e1gina, pierde los 32 bits superiores de la informaci\u00f3n de tama\u00f1o de 64 bits debido a un tipo inadecuado de variable local a la que se asigna el valor de i_size. Esto caus\u00f3 un valor de desplazamiento de bytes grande debido al desbordamiento en el c\u00e1lculo de la direcci\u00f3n final en la llamada nilfs_find_entry(), lo que result\u00f3 en un acceso a memoria que excede el tama\u00f1o de folio/p\u00e1gina. Solucione este problema cambiando el tipo de la variable local que causa la p\u00e9rdida de bits de \"unsigned int\" a \"u64\". El valor de retorno de nilfs_last_byte() tambi\u00e9n es del tipo \"unsigned int\", pero se trunca para no superar PAGE_SIZE y no se produce ninguna p\u00e9rdida de bits, por lo que no se requiere ning\u00fan cambio."}], "id": "CVE-2024-56619", "lastModified": "2025-11-03T21:18:09.053", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-12-27T15:15:21.437", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/09d6d05579fd46e61abf6e457bb100ff11f3a9d3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/31f7b57a77d4c82a34ddcb6ff35b5aa577ef153e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/48eb6e7404948032bbe811c5affbe39f6b316951"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5af8366625182f01f6d8465c9a3210574673af57"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/985ebec4ab0a28bb5910c3b1481a40fbf7f9e61d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c3afea07477baccdbdec4483f8d5e59d42a3f67f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e3732102a9d638d8627d14fdf7b208462f0520e0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry()", "id": "2334500", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334500"}, "csaw": false, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnilfs2: fix potential out-of-bounds memory access in nilfs_find_entry()\nSyzbot reported that when searching for records in a directory where the\ninode's i_size is corrupted and has a large value, memory access outside\nthe folio/page range may occur, or a use-after-free bug may be detected if\nKASAN is enabled.\nThis is because nilfs_last_byte(), which is called by nilfs_find_entry()\nand others to calculate the number of valid bytes of directory data in a\npage from i_size and the page index, loses the upper 32 bits of the 64-bit\nsize information due to an inappropriate type of local variable to which\nthe i_size value is assigned.\nThis caused a large byte offset value due to underflow in the end address\ncalculation in the calling nilfs_find_entry(), resulting in memory access\nthat exceeds the folio/page size.\nFix this issue by changing the type of the local variable causing the bit\nloss from \"unsigned int\" to \"u64\". The return value of nilfs_last_byte()\nis also of type \"unsigned int\", but it is truncated so as not to exceed\nPAGE_SIZE and no bit loss occurs, so no change is required."], "name": "CVE-2024-56619", "package_state": [{"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": "2024-12-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-56619\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-56619\nhttps://git.kernel.org/stable/c/09d6d05579fd46e61abf6e457bb100ff11f3a9d3\nhttps://git.kernel.org/stable/c/31f7b57a77d4c82a34ddcb6ff35b5aa577ef153e\nhttps://git.kernel.org/stable/c/48eb6e7404948032bbe811c5affbe39f6b316951\nhttps://git.kernel.org/stable/c/5af8366625182f01f6d8465c9a3210574673af57\nhttps://git.kernel.org/stable/c/c3afea07477baccdbdec4483f8d5e59d42a3f67f"], "threat_severity": "Moderate"}