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CVE PROGRAM SOURCE RECORD8.4 High

CVE-2026-93190

platform/chrome: cros_ec_typec: Reject out-of-bounds PD cap count

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d to < 7617b210a2200b76d8f171819390468c7d189c80affected
  • 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d to < 4e37371cb4e3b8ff564d7760029236a7bd614562affected
  • 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d to < 2a7a4e45a3aa4f4ef7013eb64649f6184b76a293affected
  • 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d to < e4728288473a5024a8bdba7d43f346719606fea0affected
  • 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d to < 54d6b0ee9b8ba434089b11843effc111dc2e6eadaffected
  • 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d to < a0a8cd9fc9c48b95095bcec4b146f7a99486f58eaffected

Linux Linux

Default version status: affected

  • 6.1affected
  • 0 to < 6.1unaffected
  • 6.1.188 to ≤ 6.1.*unaffected
  • 6.6.157 to ≤ 6.6.*unaffected
  • 6.12.110 to ≤ 6.12.*unaffected
  • 6.18.52 to ≤ 6.18.*unaffected
  • 7.2.6 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References