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CVE-2022-39842

Estado: ModificadaMedia (6.1)—

Se ha detectado un problema en el kernel de Linux versiones anteriores a 5.19. En la función pxa3xx_gcu_write en el archivo drivers/video/fbdev/pxa3xx-gcu.c, el parámetro count presenta un conflicto de tipo size_t frente a int, causando un desbordamiento de enteros y omite la comprobación de tamaño. Además, al ser usado como tercer argumento de copy_from_user(), puede producirse un desbordamiento de pila

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).

Tecnologías afectadas (2)

Debian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2022-39842",
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    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 4.2,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
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      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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              "status": "affected",
              "version": "n/a"
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        }
      ]
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  ],
  "published": "2022-09-05T07:15:08.170",
  "references": [
    {
      "url": "https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
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      "url": "https://github.com/torvalds/linux/commit/a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7",
      "tags": [
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      "tags": [
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      "source": "cve@mitre.org"
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      "url": "https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html",
      "tags": [
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      "source": "cve@mitre.org"
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      "source": "cve@mitre.org"
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    {
      "url": "https://www.debian.org/security/2022/dsa-5257",
      "tags": [
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      "source": "cve@mitre.org"
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    {
      "url": "https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19",
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "url": "https://www.debian.org/security/2022/dsa-5257",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-190"
        }
      ]
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  "descriptions": [
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      "lang": "en",
      "value": "An issue was discovered in the Linux kernel before 5.19. In pxa3xx_gcu_write in drivers/video/fbdev/pxa3xx-gcu.c, the count parameter has a type conflict of size_t versus int, causing an integer overflow and bypassing the size check. After that, because it is used as the third argument to copy_from_user(), a heap overflow may occur. NOTE: the original discoverer disputes that the overflow can actually happen."
    },
    {
      "lang": "es",
      "value": "Se ha detectado un problema en el kernel de Linux versiones anteriores a 5.19. En la función pxa3xx_gcu_write en el archivo drivers/video/fbdev/pxa3xx-gcu.c, el parámetro count presenta un conflicto de tipo size_t frente a int, causando un desbordamiento de enteros y omite la comprobación de tamaño. Además, al ser usado como tercer argumento de copy_from_user(), puede producirse un desbordamiento de pila"
    }
  ],
  "lastModified": "2026-06-17T04:58:24.933",
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