CVE-2026-64270

Estado: ModificadaAlta (7.8)—

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

Input: mms114 - reject an oversized device packet size

mms114_interrupt() reads a packet of touch data from the device into a fixed-size on-stack buffer

which holds MMS114_MAX_TOUCH (10) events of MMS114_EVENT_SIZE (8) bytes, i.e. 80 bytes. The length of the I2C read into it is taken verbatim from the device:

packet_size is a single device register byte (0x0F) and the only check is the lower bound packet_size <= 0; it is never bounded against the size of touch[].

Leer descripción completaMostrar menos

A malfunctioning, malicious or counterfeit controller (or an attacker tampering with the I2C bus) can report a packet_size of up to 255, so __mms114_read_reg() writes up to 175 bytes past the end of touch[] on the IRQ-thread stack: a stack out-of-bounds write that can overwrite the stack canary, saved registers and the return address.

A well-formed device never reports more than the buffer holds, so reject an oversized packet and drop the report, consistent with the handler's other error paths, rather than reading past the buffer.

Detalles técnicos trazas, registros y código del informe original

	struct mms114_touch touch[MMS114_MAX_TOUCH];

	packet_size = mms114_read_reg(data, MMS114_PACKET_SIZE);
	if (packet_size <= 0)
		goto out;
	...
	error = __mms114_read_reg(data, MMS114_INFORMATION, packet_size,
			(u8 *)touch);

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: 0.17%
Percentil entre todas las CVEs puntuadas: 6
Fecha de la puntuación: 5/10/2026

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 escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution75 %
Impacto secundarioT1499.004 Application or System Exploitationimpact60 %

Buffer overflow en kernel con AV:L/PR:L permite escalada de privilegios y ejecución de código mediante sobrescritura de dirección de retorno. Requiere acceso local y dispositivo I2C malicioso.

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 Filter Network Traffic

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\nInput: mms114 - reject an oversized device packet size\n\nmms114_interrupt() reads a packet of touch data from the device into a\nfixed-size on-stack buffer\n\n\tstruct mms114_touch touch[MMS114_MAX_TOUCH];\n\nwhich holds MMS114_MAX_TOUCH (10) events of MMS114_EVENT_SIZE (8) bytes,\ni.e. 80 bytes. The length of the I2C read into it is taken verbatim from\nthe device:\n\n\tpacket_size = mms114_read_reg(data, MMS114_PACKET_SIZE);\n\tif (packet_size <= 0)\n\t\tgoto out;\n\t...\n\terror = __mms114_read_reg(data, MMS114_INFORMATION, packet_size,\n\t\t\t(u8 *)touch);\n\npacket_size is a single device register byte (0x0F) and the only check\nis the lower bound packet_size <= 0; it is never bounded against the\nsize of touch[]. A malfunctioning, malicious or counterfeit controller\n(or an attacker tampering with the I2C bus) can report a packet_size of\nup to 255, so __mms114_read_reg() writes up to 175 bytes past the end of\ntouch[] on the IRQ-thread stack: a stack out-of-bounds write that can\noverwrite the stack canary, saved registers and the return address.\n\nA well-formed device never reports more than the buffer holds, so reject\nan oversized packet and drop the report, consistent with the handler's\nother error paths, rather than reading past the buffer."
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