CVE-2026-23235

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-23235
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix out-of-bounds access in sysfs attribute read/write Some f2fs sysfs attributes suffer from out-of-bounds memory access and incorrect handling of integer values whose size is not 4 bytes. For example: vm:~# echo 65537 > /sys/fs/f2fs/vde/carve_out vm:~# cat /sys/fs/f2fs/vde/carve_out 65537 vm:~# echo 4294967297 > /sys/fs/f2fs/vde/atgc_age_threshold vm:~# cat /sys/fs/f2fs/vde/atgc_age_threshold 1 carve_out maps to {struct f2fs_sb_info}->carve_out, which is a 8-bit integer. However, the sysfs interface allows setting it to a value larger than 255, resulting in an out-of-range update. atgc_age_threshold maps to {struct atgc_management}->age_threshold, which is a 64-bit integer, but its sysfs interface cannot correctly set values larger than UINT_MAX. The root causes are: 1. __sbi_store() treats all default values as unsigned int, which prevents updating integers larger than 4 bytes and causes out-of-bounds writes for integers smaller than 4 bytes. 2. f2fs_sbi_show() also assumes all default values are unsigned int, leading to out-of-bounds reads and incorrect access to integers larger than 4 bytes. This patch introduces {struct f2fs_attr}->size to record the actual size of the integer associated with each sysfs attribute. With this information, sysfs read and write operations can correctly access and update values according to their real data size, avoiding memory corruption and truncation.

7.1 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/3a905e183c047577b154f08a78ac3039e9454703 Patch
https://git.kernel.org/stable/c/438a405fbad6882df0e34b3e1a16839a71f04240 Patch
https://git.kernel.org/stable/c/4ef30b9f1641c9e877792df6b049f1cf507d002d Patch
https://git.kernel.org/stable/c/6a6c07a9b49e43f0df42d7118fc76aa555c73d98 Patch
https://git.kernel.org/stable/c/98ea0039dbfdd00e5cc1b9a8afa40434476c0955 Patch
https://git.kernel.org/stable/c/d4a594dd952df123cbdcdee9b9640d9d55e4a954 Patch
https://git.kernel.org/stable/c/e85a99db9ab85dfc30d93b0ca0e9156f3127f55a Patch
https://git.kernel.org/stable/c/eebd72cff518ac87e660aefb8a41224bd88c32ce Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

17 Mar 2026, 21:20

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: f2fs: corrige el acceso fuera de límites en la lectura/escritura de atributos sysfs Algunos atributos sysfs de f2fs sufren de acceso a memoria fuera de límites y manejo incorrecto de valores enteros cuyo tamaño no es de 4 bytes. Por ejemplo: vm:~# echo 65537 > /sys/fs/f2fs/vde/carve_out vm:~# cat /sys/fs/f2fs/vde/carve_out 65537 vm:~# echo 4294967297 > /sys/fs/f2fs/vde/atgc_age_threshold vm:~# cat /sys/fs/f2fs/vde/atgc_age_threshold 1 carve_out se mapea a {struct f2fs_sb_info}->carve_out, que es un entero de 8 bits. Sin embargo, la interfaz sysfs permite establecerlo a un valor mayor que 255, lo que resulta en una actualización fuera de rango. atgc_age_threshold se mapea a {struct atgc_management}->age_threshold, que es un entero de 64 bits, pero su interfaz sysfs no puede establecer correctamente valores mayores que UINT_MAX. Las causas raíz son: 1. __sbi_store() trata todos los valores predeterminados como unsigned int, lo que impide actualizar enteros mayores de 4 bytes y causa escrituras fuera de límites para enteros menores de 4 bytes. 2. f2fs_sbi_show() también asume que todos los valores predeterminados son unsigned int, lo que lleva a lecturas fuera de límites y acceso incorrecto a enteros mayores de 4 bytes. Este parche introduce {struct f2fs_attr}->size para registrar el tamaño real del entero asociado con cada atributo sysfs. Con esta información, las operaciones de lectura y escritura de sysfs pueden acceder y actualizar valores correctamente según su tamaño de datos real, evitando la corrupción de memoria y la truncación.
References () https://git.kernel.org/stable/c/3a905e183c047577b154f08a78ac3039e9454703 - () https://git.kernel.org/stable/c/3a905e183c047577b154f08a78ac3039e9454703 - Patch
References () https://git.kernel.org/stable/c/438a405fbad6882df0e34b3e1a16839a71f04240 - () https://git.kernel.org/stable/c/438a405fbad6882df0e34b3e1a16839a71f04240 - Patch
References () https://git.kernel.org/stable/c/4ef30b9f1641c9e877792df6b049f1cf507d002d - () https://git.kernel.org/stable/c/4ef30b9f1641c9e877792df6b049f1cf507d002d - Patch
References () https://git.kernel.org/stable/c/6a6c07a9b49e43f0df42d7118fc76aa555c73d98 - () https://git.kernel.org/stable/c/6a6c07a9b49e43f0df42d7118fc76aa555c73d98 - Patch
References () https://git.kernel.org/stable/c/98ea0039dbfdd00e5cc1b9a8afa40434476c0955 - () https://git.kernel.org/stable/c/98ea0039dbfdd00e5cc1b9a8afa40434476c0955 - Patch
References () https://git.kernel.org/stable/c/d4a594dd952df123cbdcdee9b9640d9d55e4a954 - () https://git.kernel.org/stable/c/d4a594dd952df123cbdcdee9b9640d9d55e4a954 - Patch
References () https://git.kernel.org/stable/c/e85a99db9ab85dfc30d93b0ca0e9156f3127f55a - () https://git.kernel.org/stable/c/e85a99db9ab85dfc30d93b0ca0e9156f3127f55a - Patch
References () https://git.kernel.org/stable/c/eebd72cff518ac87e660aefb8a41224bd88c32ce - () https://git.kernel.org/stable/c/eebd72cff518ac87e660aefb8a41224bd88c32ce - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.1
First Time Linux
Linux linux Kernel
CWE CWE-125
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

04 Mar 2026, 15:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-04 15:16

Updated : 2026-03-17 21:20

NVD link : CVE-2026-23235

Mitre link : CVE-2026-23235

CVE.ORG link : CVE-2026-23235

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-125

Out-of-bounds Read