CVE-2026-93190: Linux Vulnerability (CVSS 8.4)

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.

Metrics

CVSS 3.1

8.4/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d, < 7617b210a2200b76d8f171819390468c7d189c80; >= 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d, < 4e37371cb4e3b8ff564d7760029236a7bd614562; >= 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d, < 2a7a4e45a3aa4f4ef7013eb64649f6184b76a293; >= 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d, < e4728288473a5024a8bdba7d43f346719606fea0; >= 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d, < 54d6b0ee9b8ba434089b11843effc111dc2e6ead; >= 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d, < a0a8cd9fc9c48b95095bcec4b146f7a99486f58e
Linux	Linux	6.1

References

Timeline

Published: Sep 17, 2026
Last Modified: Sep 18, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-93190?

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.

How severe is CVE-2026-93190?

CVE-2026-93190 has a CVSS score of 8.4/10 (HIGH severity).

How do I fix CVE-2026-93190?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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