CVE-2026-90048
fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
Description
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list() ni_create_attr_list() allocates a fixed buffer of al_aligned(record_size) (== record_size) bytes and then walks every attribute of the primary MFT record, writing one ATTR_LIST_ENTRY per attribute and advancing the cursor by le_size(name_len), with no check against the end of the buffer; the total size is only computed after the loop. A minimum-size resident attribute occupies SIZEOF_RESIDENT (0x18 = 24) bytes on disk, but an unnamed attribute expands to le_size(0) (0x20 = 32) bytes in the list. Because the number of attributes in a record is not bounded (mi_enum_attr() accepts arbitrarily many equal-type, nameless minimum-size attributes), a crafted record packed with such attributes produces a list larger than record_size and overflows the heap buffer. This is reachable from a crafted, loop-mounted NTFS image: opening the file and adding an attribute (e.g. via setxattr) drives ntfs_set_ea() -> ni_insert_resident() -> ni_insert_attr() -> ni_ins_attr_ext() -> ni_create_attr_list(). BUG: KASAN: slab-out-of-bounds in ni_create_attr_list+0xc48/0x1058 Write of size 4 at addr ffff000008984c00 by task setfattr/345 ni_create_attr_list+0xc48/0x1058 ni_ins_attr_ext+0x510/0x7c0 ni_insert_attr+0x3f8/0x70c ni_insert_resident+0xc8/0x3b0 ntfs_set_ea+0x66c/0xd28 ntfs_setxattr+0x4d8/0x5b0 __arm64_sys_setxattr+0xa4/0x124 Allocated by task 345: ni_create_attr_list+0x188/0x1058 The buggy address belongs to the cache kmalloc-1k of size 1024 (the write lands at object+1024). Size the buffer from the actual attributes instead of assuming a single record_size is always enough.
INFO
Published Date :
Sept. 16, 2026, 11:17 a.m.
Last Modified :
Oct. 30, 2026, 1:20 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to a fixed version.
- Size the buffer based on actual attribute sizes.
- Validate attribute list size before writing.
- Apply vendor patches for NTFS3 driver.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-90048.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-90048 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-90048
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-90048 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-90048 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 30, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/90xxx/CVE-2026-90048.json">CVE-2026-90048</a> Added Reference https://git.kernel.org/stable/c/3a38f3c71bcd9bd58d86489c364bd29a4c2c860e -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 19, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/90xxx/CVE-2026-90048.json">CVE-2026-90048</a> -
CVE Translated by [email protected]
Sep. 28, 2026
Action Type Old Value New Value Added Translation Title: la biblioteca CGM_NIST_Loader.dll en JT2Go, Teamcenter Visualization, Description: En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: fs/ntfs3: corrige escritura fuera de límites de slab en ni_create_attr_list() ni_create_attr_list() asigna un búfer fijo de al_aligned(record_size) (== record_size) bytes y luego recorre cada atributo del registro MFT primario, escribiendo una ATTR_LIST_ENTRY por atributo y avanzando el cursor por le_size(name_len), sin ninguna comprobación contra el final del búfer; el tamaño total solo se calcula después del bucle. Un atributo residente de tamaño mínimo ocupa SIZEOF_RESIDENT (0x18 = 24) bytes en disco, pero un atributo sin nombre se expande a le_size(0) (0x20 = 32) bytes en la lista. Debido a que el número de atributos en un registro no está limitado (mi_enum_attr() acepta un número arbitrario de atributos de tipo igual, sin nombre y de tamaño mínimo), un registro manipulado lleno de tales atributos produce una lista mayor que record_size y desborda el búfer del heap. Esto es alcanzable desde una imagen NTFS manipulada, montada en bucle: abrir el archivo y añadir un atributo (p. ej., a través de setxattr) impulsa ntfs_set_ea() -> ni_insert_resident() -> ni_insert_attr() -> ni_ins_attr_ext() -> ni_create_attr_list(). ERROR: KASAN: escritura fuera de límites de slab en ni_create_attr_list+0xc48/0x1058 Escritura de tamaño 4 en la dirección ffff000008984c00 por la tarea setfattr/345 ni_create_attr_list+0xc48/0x1058 ni_ins_attr_ext+0x510/0x7c0 ni_insert_attr+0x3f8/0x70c ni_insert_resident+0xc8/0x3b0 ntfs_set_ea+0x66c/0xd28 ntfs_setxattr+0x4d8/0x5b0 __arm64_sys_setxattr+0xa4/0x124 Asignado por la tarea 345: ni_create_attr_list+0x188/0x1058 La dirección errónea pertenece a la caché kmalloc-1k de tamaño 1024 (la escritura cae en object+1024). Dimensionar el búfer a partir de los atributos reales en lugar de asumir que un único record_size es siempre suficiente. -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 16, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 16, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list() ni_create_attr_list() allocates a fixed buffer of al_aligned(record_size) (== record_size) bytes and then walks every attribute of the primary MFT record, writing one ATTR_LIST_ENTRY per attribute and advancing the cursor by le_size(name_len), with no check against the end of the buffer; the total size is only computed after the loop. A minimum-size resident attribute occupies SIZEOF_RESIDENT (0x18 = 24) bytes on disk, but an unnamed attribute expands to le_size(0) (0x20 = 32) bytes in the list. Because the number of attributes in a record is not bounded (mi_enum_attr() accepts arbitrarily many equal-type, nameless minimum-size attributes), a crafted record packed with such attributes produces a list larger than record_size and overflows the heap buffer. This is reachable from a crafted, loop-mounted NTFS image: opening the file and adding an attribute (e.g. via setxattr) drives ntfs_set_ea() -> ni_insert_resident() -> ni_insert_attr() -> ni_ins_attr_ext() -> ni_create_attr_list(). BUG: KASAN: slab-out-of-bounds in ni_create_attr_list+0xc48/0x1058 Write of size 4 at addr ffff000008984c00 by task setfattr/345 ni_create_attr_list+0xc48/0x1058 ni_ins_attr_ext+0x510/0x7c0 ni_insert_attr+0x3f8/0x70c ni_insert_resident+0xc8/0x3b0 ntfs_set_ea+0x66c/0xd28 ntfs_setxattr+0x4d8/0x5b0 __arm64_sys_setxattr+0xa4/0x124 Allocated by task 345: ni_create_attr_list+0x188/0x1058 The buggy address belongs to the cache kmalloc-1k of size 1024 (the write lands at object+1024). Size the buffer from the actual attributes instead of assuming a single record_size is always enough. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/90xxx/CVE-2026-90048.json">CVE-2026-90048</a> Added Reference https://git.kernel.org/stable/c/7c4841e2a62794a3bab7c1ff0540580f387e377f Added Reference https://git.kernel.org/stable/c/7e9aee7e4d9767cc3e423b3beecb01c7ebb6bbcd Added Reference https://git.kernel.org/stable/c/a84f3db72561c4d9281c5ff721ce46b9ffa7f30e Added Reference https://git.kernel.org/stable/c/d07e281f2a7710502985d6f80b95ddac8f4e81d5 Added Reference https://git.kernel.org/stable/c/fa2215cf451414b0512cd6f7d37a057893811f4d