CVE-2026-46294

Estado: AnalizadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

dm: fix a buffer overflow in ioctl processing

Tony Asleson (using Claude) found a buffer overflow in dm-ioctl in the function retrieve_status:

Detalles técnicos trazas, registros y código del informe original

1. The code in retrieve_status checks that the output string fits into
   the output buffer and writes the output string there
2. Then, the code aligns the "outptr" variable to the next 8-byte
   boundary:
	outptr = align_ptr(outptr);
3. The alignment doesn't check overflow, so outptr could point past the
   buffer end
4. The "for" loop is iterated again, it executes:
	remaining = len - (outptr - outbuf);
5. If "outptr" points past "outbuf + len", the arithmetics wraps around
   and the variable "remaining" contains unusually high number
6. With "remaining" being high, the code writes more data past the end of
   the buffer

Luckily, this bug has no security implications because:
1. Only root can issue device mapper ioctls
2. The commonly used libraries that communicate with device mapper
   (libdevmapper and devicemapper-rs) use buffer size that is aligned to
   8 bytes - thus, "outptr = align_ptr(outptr)" can't overshoot the input
   buffer and the bug can't happen accidentally

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.19%
Percentil entre todas las CVEs puntuadas: 8
Fecha de la puntuación: 6/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation95 %
Impacto principalT1059 Command and Scripting Interpreterexecution75 %

Acceso local (AV:L) con privilegios (PR:L) sin interacción permite escalada mediante buffer overflow en dm-ioctl. Root puede ejecutar código arbitrario.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-787

Referencias

JSON original (NVD)

Mostrar

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix a buffer overflow in ioctl processing\n\nTony Asleson (using Claude) found a buffer overflow in dm-ioctl in the\nfunction retrieve_status:\n\n1. The code in retrieve_status checks that the output string fits into\n   the output buffer and writes the output string there\n2. Then, the code aligns the \"outptr\" variable to the next 8-byte\n   boundary:\n\toutptr = align_ptr(outptr);\n3. The alignment doesn't check overflow, so outptr could point past the\n   buffer end\n4. The \"for\" loop is iterated again, it executes:\n\tremaining = len - (outptr - outbuf);\n5. If \"outptr\" points past \"outbuf + len\", the arithmetics wraps around\n   and the variable \"remaining\" contains unusually high number\n6. With \"remaining\" being high, the code writes more data past the end of\n   the buffer\n\nLuckily, this bug has no security implications because:\n1. Only root can issue device mapper ioctls\n2. The commonly used libraries that communicate with device mapper\n   (libdevmapper and devicemapper-rs) use buffer size that is aligned to\n   8 bytes - thus, \"outptr = align_ptr(outptr)\" can't overshoot the input\n   buffer and the bug can't happen accidentally"
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      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndm: corrige un desbordamiento de búfer en el procesamiento de ioctl\n\nTony Asleson (usando Claude) encontró un desbordamiento de búfer en dm-ioctl en la función retrieve_status:\n\n1. El código en retrieve_status verifica que la cadena de salida cabe en el búfer de salida y escribe la cadena de salida allí\n2. Luego, el código alinea la variable 'outptr' al siguiente límite de 8 bytes:\n\toutptr = align_ptr(outptr);\n3. La alineación no verifica el desbordamiento, por lo que 'outptr' podría apuntar más allá del final del búfer\n4. El bucle 'for' se itera de nuevo, ejecuta:\n\tremaining = len - (outptr - outbuf);\n5. Si 'outptr' apunta más allá de 'outbuf + len', la aritmética se desborda y la variable 'remaining' contiene un número inusualmente alto\n6. Siendo 'remaining' alto, el código escribe más datos más allá del final del búfer\n\nAfortunadamente, este error no tiene implicaciones de seguridad porque:\n1. Solo root puede emitir ioctls del mapeador de dispositivos\n2. Las bibliotecas comúnmente utilizadas que se comunican con el mapeador de dispositivos (libdevmapper y devicemapper-rs) usan un tamaño de búfer que está alineado a 8 bytes; por lo tanto, 'outptr = align_ptr(outptr)' no puede exceder el búfer de entrada y el error no puede ocurrir accidentalmente"
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