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FKIE_CVE-2026-93190

Vulnerability from fkie_nvd - Published: 2026-09-17 17:18 - Updated: 2026-09-17 17:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: platform/chrome: cros_ec_typec: Reject out-of-bounds PD cap count cros_typec_register_partner_pdos() copies the partner PDOs from the EC TYPEC_STATUS response into the fixed caps_desc.pdo[PDO_MAX_OBJECTS] array. memcpy(caps_desc.pdo, resp->source_cap_pdos, sizeof(u32) * resp->source_cap_count); ... memcpy(caps_desc.pdo, resp->sink_cap_pdos, sizeof(u32) * resp->sink_cap_count); PDO_MAX_OBJECTS is 7. source_cap_count and sink_cap_count are u8 fields from the EC. The only check is that they are not both zero. If either is larger than 7, the memcpy writes past the end of the array on the stack. A count of 255 overflows it by about 1 KB. The EC source arrays are only seven entries wide. A larger count reads past them too. The ChromeOS EC firmware caps these counts today, so a compliant setup does not hit this. The kernel should still validate these values rather than trust them. Validate the counts in cros_typec_register_partner_pdos() next to the memcpy. Skip the PDO registration if either count is above PDO_MAX_OBJECTS. The rest of cros_typec_handle_status() still runs so events are handled and cleared.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a7a4e45a3aa4f4ef7013eb64649f6184b76a293
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4e37371cb4e3b8ff564d7760029236a7bd614562
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/54d6b0ee9b8ba434089b11843effc111dc2e6ead
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7617b210a2200b76d8f171819390468c7d189c80
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a0a8cd9fc9c48b95095bcec4b146f7a99486f58e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e4728288473a5024a8bdba7d43f346719606fea0
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/platform/chrome/cros_ec_typec.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7617b210a2200b76d8f171819390468c7d189c80",
              "status": "affected",
              "version": "348a2e8c93d3ca622cf1b293cd2f597c9db74d9d",
              "versionType": "git"
            },
            {
              "lessThan": "4e37371cb4e3b8ff564d7760029236a7bd614562",
              "status": "affected",
              "version": "348a2e8c93d3ca622cf1b293cd2f597c9db74d9d",
              "versionType": "git"
            },
            {
              "lessThan": "2a7a4e45a3aa4f4ef7013eb64649f6184b76a293",
              "status": "affected",
              "version": "348a2e8c93d3ca622cf1b293cd2f597c9db74d9d",
              "versionType": "git"
            },
            {
              "lessThan": "e4728288473a5024a8bdba7d43f346719606fea0",
              "status": "affected",
              "version": "348a2e8c93d3ca622cf1b293cd2f597c9db74d9d",
              "versionType": "git"
            },
            {
              "lessThan": "54d6b0ee9b8ba434089b11843effc111dc2e6ead",
              "status": "affected",
              "version": "348a2e8c93d3ca622cf1b293cd2f597c9db74d9d",
              "versionType": "git"
            },
            {
              "lessThan": "a0a8cd9fc9c48b95095bcec4b146f7a99486f58e",
              "status": "affected",
              "version": "348a2e8c93d3ca622cf1b293cd2f597c9db74d9d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/platform/chrome/cros_ec_typec.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.1"
            },
            {
              "lessThan": "6.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/chrome: cros_ec_typec: Reject out-of-bounds PD cap count\n\ncros_typec_register_partner_pdos() copies the partner PDOs from the EC\nTYPEC_STATUS response into the fixed caps_desc.pdo[PDO_MAX_OBJECTS] array.\n\n\tmemcpy(caps_desc.pdo, resp-\u003esource_cap_pdos,\n\t       sizeof(u32) * resp-\u003esource_cap_count);\n\t...\n\tmemcpy(caps_desc.pdo, resp-\u003esink_cap_pdos,\n\t       sizeof(u32) * resp-\u003esink_cap_count);\n\nPDO_MAX_OBJECTS is 7. source_cap_count and sink_cap_count are u8 fields\nfrom the EC. The only check is that they are not both zero. If either is\nlarger than 7, the memcpy writes past the end of the array on the stack.\nA count of 255 overflows it by about 1 KB. The EC source arrays are only\nseven entries wide. A larger count reads past them too.\n\nThe ChromeOS EC firmware caps these counts today, so a compliant setup\ndoes not hit this. The kernel should still validate these values rather\nthan trust them.\n\nValidate the counts in cros_typec_register_partner_pdos() next to the\nmemcpy. Skip the PDO registration if either count is above PDO_MAX_OBJECTS.\nThe rest of cros_typec_handle_status() still runs so events are handled\nand cleared."
    }
  ],
  "id": "CVE-2026-93190",
  "lastModified": "2026-09-17T17:18:15.177",
  "metrics": {},
  "published": "2026-09-17T17:18:15.177",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2a7a4e45a3aa4f4ef7013eb64649f6184b76a293"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4e37371cb4e3b8ff564d7760029236a7bd614562"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/54d6b0ee9b8ba434089b11843effc111dc2e6ead"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7617b210a2200b76d8f171819390468c7d189c80"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a0a8cd9fc9c48b95095bcec4b146f7a99486f58e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e4728288473a5024a8bdba7d43f346719606fea0"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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