fkie_cve-2024-56619
Vulnerability from fkie_nvd
Published
2024-12-27 15:15
Modified
2025-11-03 21:18
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry()
Syzbot reported that when searching for records in a directory where the
inode's i_size is corrupted and has a large value, memory access outside
the folio/page range may occur, or a use-after-free bug may be detected if
KASAN is enabled.
This is because nilfs_last_byte(), which is called by nilfs_find_entry()
and others to calculate the number of valid bytes of directory data in a
page from i_size and the page index, loses the upper 32 bits of the 64-bit
size information due to an inappropriate type of local variable to which
the i_size value is assigned.
This caused a large byte offset value due to underflow in the end address
calculation in the calling nilfs_find_entry(), resulting in memory access
that exceeds the folio/page size.
Fix this issue by changing the type of the local variable causing the bit
loss from "unsigned int" to "u64". The return value of nilfs_last_byte()
is also of type "unsigned int", but it is truncated so as not to exceed
PAGE_SIZE and no bit loss occurs, so no change is required.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 6.13 |
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix potential out-of-bounds memory access in nilfs_find_entry()\n\nSyzbot reported that when searching for records in a directory where the\ninode\u0027s 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.\n\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.\n\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.\n\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."
},
{
"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": {
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"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"
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"published": "2024-12-27T15:15:21.437",
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
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}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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