FKIE_CVE-2026-23323

Vulnerability from fkie_nvd - Published: 2026-03-25 11:16 - Updated: 2026-06-17 10:21
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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. 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. 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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5dd69b864911ae3847365e8bafe7854e79fbeecbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/625ef35b70d3883fb9a41cd5a988e64dd3e447d6Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel 6.19
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/macsmc-hwmon.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/macsmc-hwmon.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "6.19"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.19.*",
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              "version": "6.19.7",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
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  "cveTags": [],
  "descriptions": [
    {
      "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-\u003etemp.sensors) instead of the\n  voltage sensor array (hwmon-\u003evolt.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 \u003e= 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."
    },
    {
      "lang": "es",
      "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 a\u00f1adido conten\u00eda varios errores cr\u00edticos en su l\u00f3gica de poblaci\u00f3n de sensores y rutinas de conversi\u00f3n de coma flotante.\n\nEspec\u00edficamente:\n- El bucle de poblaci\u00f3n del sensor de voltaje usaba el prefijo incorrecto (\u0027volt-\u0027 en lugar de \u0027voltage-\u0027) y asignaba incorrectamente los sensores al array de sensores de temperatura (hwmon-\u0026gt;temp.sensors) en lugar del array de sensores de voltaje (hwmon-\u0026gt;volt.sensors). Esto llevar\u00eda a acceso a memoria fuera de l\u00edmites o corrupci\u00f3n de datos cuando ambos sensores de temperatura y voltaje estaban presentes.\n- La conversi\u00f3n de coma flotante en macsmc_hwmon_write_f32() ten\u00eda una l\u00f3gica de exponente defectuosa para valores \u0026gt;= 2^24 y carec\u00eda de enmascaramiento para la mantisa, lo que podr\u00eda 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 est\u00e1 solucionado declarando macsmc_hwmon_write_f32() como __always_inline para una prueba de compilaci\u00f3n."
    }
  ],
  "id": "CVE-2026-23323",
  "lastModified": "2026-06-17T10:21:19.703",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-03-25T11:16:29.250",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5dd69b864911ae3847365e8bafe7854e79fbeecb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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