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CVE-2022-49612

Estado: AnalizadaAlta (7.8)—

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

power: supply: core: Fix boundary conditions in interpolation

The functions power_supply_temp2resist_simple and power_supply_ocv2cap_simple handle boundary conditions incorrectly. The change was introduced in a4585ba2050f460f749bbaf2b67bd56c41e30283 ("power: supply: core: Use library interpolation"). There are two issues: First, the lines "high = i - 1" and "high = i" in ocv2cap have the wrong order compared to temp2resist. As a consequence, ocv2cap sets high=-1 if ocv>table[0].ocv, which causes an out-of-bounds read.

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Second, the logic of temp2resist is also not correct. Consider the case table[] = {{20, 100}, {10, 80}, {0, 60}}. For temp=5, we expect a resistance of 70% by interpolation. However, temp2resist sets high=low=2 and returns 60.

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.

Buffer overflow (CWE-787) en kernel Linux con acceso local (AV:L/PR:L) permite escalada de privilegios y ejecución de código mediante lectura fuera de límites en funciones de interpolación.

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 PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "baseScore": 7.8,
          "attackVector": "LOCAL",
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
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          "product": "Linux",
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          "programFiles": [
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  "published": "2025-02-26T07:01:36.653",
  "references": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-787"
        }
      ]
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npower: supply: core: Fix boundary conditions in interpolation\n\nThe functions power_supply_temp2resist_simple and power_supply_ocv2cap_simple\nhandle boundary conditions incorrectly.\nThe change was introduced in a4585ba2050f460f749bbaf2b67bd56c41e30283\n(\"power: supply: core: Use library interpolation\").\nThere are two issues: First, the lines \"high = i - 1\" and \"high = i\" in ocv2cap\nhave the wrong order compared to temp2resist. As a consequence, ocv2cap\nsets high=-1 if ocv>table[0].ocv, which causes an out-of-bounds read.\nSecond, the logic of temp2resist is also not correct.\nConsider the case table[] = {{20, 100}, {10, 80}, {0, 60}}.\nFor temp=5, we expect a resistance of 70% by interpolation.\nHowever, temp2resist sets high=low=2 and returns 60."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: power: supply: core: Fix boundary conditions in interpolation The functions power_supply_temp2resist_simple and power_supply_ocv2cap_simple handle boundary conditions incorrectly. El cambio se introdujo en a4585ba2050f460f749bbaf2b67bd56c41e30283 (\"power: supply: core: Use library interpolation\"). Hay dos problemas: primero, las líneas \"high = i - 1\" y \"high = i\" en ocv2cap tienen el orden incorrecto en comparación con temp2resist. Como consecuencia, ocv2cap establece high=-1 si ocv>table[0].ocv, lo que provoca una lectura fuera de los límites. Segundo, la lógica de temp2resist tampoco es correcta. Considere el caso table[] = {{20, 100}, {10, 80}, {0, 60}}. Para temp=5, esperamos una resistencia del 70 % por interpolación. Sin embargo, temp2resist establece high=low=2 y devuelve 60."
    }
  ],
  "lastModified": "2026-06-17T05:18:37.690",
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