CVE-2026-93190 is a vulnerability in Linux Kernel
Published on September 17, 2026
platform/chrome: cros_ec_typec: Reject out-of-bounds PD cap count
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.
Products Associated with CVE-2026-93190
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Affected Versions
Linux:- Version 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d and below 7617b210a2200b76d8f171819390468c7d189c80 is affected.
- Version 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d and below 4e37371cb4e3b8ff564d7760029236a7bd614562 is affected.
- Version 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d and below 2a7a4e45a3aa4f4ef7013eb64649f6184b76a293 is affected.
- Version 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d and below e4728288473a5024a8bdba7d43f346719606fea0 is affected.
- Version 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d and below 54d6b0ee9b8ba434089b11843effc111dc2e6ead is affected.
- Version 348a2e8c93d3ca622cf1b293cd2f597c9db74d9d and below a0a8cd9fc9c48b95095bcec4b146f7a99486f58e is affected.
- Version 6.1 is affected.
- Before 6.1 is unaffected.
- Version 6.1.188, <= 6.1.* is unaffected.
- Version 6.6.157, <= 6.6.* is unaffected.
- Version 6.12.110, <= 6.12.* is unaffected.
- Version 6.18.52, <= 6.18.* is unaffected.
- Version 7.2.6, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.