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CVE-2026-23323

Estado: AnalizadaAlta (7.8)—

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

hwmon: (macsmc) Fix regressions in Apple Silicon SMC hwmon driver

The recently added macsmc-hwmon driver contained several critical bugs in its sensor population logic and float conversion routines.

Fix these issues to ensure correct sensor registration and reliable manual fan control.

Confirm that the reported overflow in FIELD_PREP is fixed by declaring macsmc_hwmon_write_f32() as __always_inline for a compile test.

Detalles técnicos trazas, registros y código del informe original
Specifically:
- The voltage sensor population loop used the wrong prefix ("volt-"
  instead of "voltage-") and incorrectly assigned sensors to the
  temperature sensor array (hwmon->temp.sensors) instead of the
  voltage sensor array (hwmon->volt.sensors). This would lead to
  out-of-bounds memory access or data corruption when both temperature
  and voltage sensors were present.
- The float conversion in macsmc_hwmon_write_f32() had flawed exponent
  logic for values >= 2^24 and lacked masking for the mantissa, which
  could lead to incorrect values being written to the SMC.

CVSS

Probabilidad de explotación (EPSS)

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.

Vulnerabilidad local (AV:L, PR:L) en kernel Linux con corrupción de memoria (CWE-787 buffer overflow) que permite escalada de privilegios; los impactos incluyen manipulación de datos de sensores SMC y potencial DoS por escritura incorrecta.

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

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageNetwork SegmentationFilter Network TrafficExecution Prevention

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (macsmc) Fix regressions in Apple Silicon SMC hwmon driver\n\nThe recently added macsmc-hwmon driver contained several critical\nbugs in its sensor population logic and float conversion routines.\n\nSpecifically:\n- The voltage sensor population loop used the wrong prefix (\"volt-\"\n  instead of \"voltage-\") and incorrectly assigned sensors to the\n  temperature sensor array (hwmon->temp.sensors) instead of the\n  voltage sensor array (hwmon->volt.sensors). This would lead to\n  out-of-bounds memory access or data corruption when both temperature\n  and voltage sensors were present.\n- The float conversion in macsmc_hwmon_write_f32() had flawed exponent\n  logic for values >= 2^24 and lacked masking for the mantissa, which\n  could lead to incorrect values being written to the SMC.\n\nFix these issues to ensure correct sensor registration and reliable\nmanual fan control.\n\nConfirm that the reported overflow in FIELD_PREP is fixed by declaring\nmacsmc_hwmon_write_f32() as __always_inline for a compile test."
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      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nhwmon: (macsmc) Corrige regresiones en el controlador hwmon SMC de Apple Silicon\n\nEl controlador macsmc-hwmon recientemente añadido contenía varios errores críticos en su lógica de población de sensores y rutinas de conversión de coma flotante.\n\nEspecíficamente:\n- El bucle de población del sensor de voltaje usaba el prefijo incorrecto ('volt-' en lugar de 'voltage-') y asignaba incorrectamente los sensores al array de sensores de temperatura (hwmon->temp.sensors) en lugar del array de sensores de voltaje (hwmon->volt.sensors). Esto llevaría a acceso a memoria fuera de límites o corrupción de datos cuando ambos sensores de temperatura y voltaje estaban presentes.\n- La conversión de coma flotante en macsmc_hwmon_write_f32() tenía una lógica de exponente defectuosa para valores >= 2^24 y carecía de enmascaramiento para la mantisa, lo que podría llevar a que se escribieran valores incorrectos en el SMC.\n\nSoluciona estos problemas para asegurar un registro correcto de los sensores y un control manual fiable del ventilador.\n\nConfirma que el desbordamiento reportado en FIELD_PREP está solucionado declarando macsmc_hwmon_write_f32() como __always_inline para una prueba de compilación."
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