CVE-2026-93190

/// Technical 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

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References