CVE-2025-68352

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: spi: ch341: fix out-of-bounds memory access in ch341_transfer_one Discovered by Atuin - Automated Vulnerability Discovery Engine. The 'len' variable is calculated as 'min(32, trans->len + 1)', which includes the 1-byte command header. When copying data from 'trans->tx_buf' to 'ch341->tx_buf + 1', using 'len' as the length is incorrect because: 1. It causes an out-of-bounds read from 'trans->tx_buf' (which has size 'trans->len', i.e., 'len - 1' in this context). 2. It can cause an out-of-bounds write to 'ch341->tx_buf' if 'len' is CH341_PACKET_LENGTH (32). Writing 32 bytes to ch341->tx_buf + 1 overflows the buffer. Fix this by copying 'len - 1' bytes.

Severity

HIGH

CVSS score

7.8 (v3.1)

Vulnerability status

Deferred

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2025-12-24 11:15:58.550000

Last modified

2026-10-19 21:10:00.160000

View original CVE JSON

{
  "id": "CVE-2025-68352",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-12-24T11:15:58.550",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: ch341: fix out-of-bounds memory access in ch341_transfer_one\n\nDiscovered by Atuin - Automated Vulnerability Discovery Engine.\n\nThe 'len' variable is calculated as 'min(32, trans->len + 1)',\nwhich includes the 1-byte command header.\n\nWhen copying data from 'trans->tx_buf' to 'ch341->tx_buf + 1', using 'len'\nas the length is incorrect because:\n\n1. It causes an out-of-bounds read from 'trans->tx_buf' (which has size\n   'trans->len', i.e., 'len - 1' in this context).\n2. It can cause an out-of-bounds write to 'ch341->tx_buf' if 'len' is\n   CH341_PACKET_LENGTH (32). Writing 32 bytes to ch341->tx_buf + 1\n   overflows the buffer.\n\nFix this by copying 'len - 1' bytes."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha corregido la siguiente vulnerabilidad:\\n\\nspi: ch341: fix out-of-bounds memory access in ch341_transfer_one\\n\\nDescubierta por Atuin - Automated Vulnerability Discovery Engine.\\n\\nLa variable 'len' se calcula como 'min(32, trans -> len + 1)', lo que incluye el encabezado de comando de 1?byte.\\n\\nAl copiar datos de 'trans -> tx_buf' a 'ch341 -> tx_buf + 1', usar 'len' como longitud es incorrecto porque:\\n\\n1. Provoca una lectura fuera de los límites de 'trans -> tx_buf' (que tiene tamaño 'trans -> len', es decir, 'len - 1' en este contexto).\\n2. Puede provocar una escritura fuera de los límites de 'ch341 -> tx_buf' si 'len' es CH341_PACKET_LENGTH (32). Escribir 32?bytes en ch341 -> tx_buf + 1 desborda el búfer.\\n\\nCorrija esto copiando 'len - 1' bytes."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/spi/spi-ch341.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "8846739f52afa07e63395c80227dc544f54bd7b1",
              "lessThan": "cad6c0fd6f3c0e76a1f75df4bce3b08a13f08974",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "8846739f52afa07e63395c80227dc544f54bd7b1",
              "lessThan": "ea1e43966cd03098fcd5f0d72e6c2901d45fa08d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "8846739f52afa07e63395c80227dc544f54bd7b1",
              "lessThan": "81841da1f30f66a850cc8796d99ba330aad9d696",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "8846739f52afa07e63395c80227dc544f54bd7b1",
              "lessThan": "545d1287e40a55242f6ab68bcc1ba3b74088b1bc",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/spi/spi-ch341.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.11",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.11",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.63",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.17.13",
              "lessThanOrEqual": "6.17.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.2",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.19",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/545d1287e40a55242f6ab68bcc1ba3b74088b1bc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/81841da1f30f66a850cc8796d99ba330aad9d696",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cad6c0fd6f3c0e76a1f75df4bce3b08a13f08974",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ea1e43966cd03098fcd5f0d72e6c2901d45fa08d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}