CVE-2026-31729

Description

In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: validate connector number in ucsi_notify_common() The connector number extracted from CCI via UCSI_CCI_CONNECTOR() is a 7-bit field (0-127) that is used to index into the connector array in ucsi_connector_change(). However, the array is only allocated for the number of connectors reported by the device (typically 2-4 entries). A malicious or malfunctioning device could report an out-of-range connector number in the CCI, causing an out-of-bounds array access in ucsi_connector_change(). Add a bounds check in ucsi_notify_common(), the central point where CCI is parsed after arriving from hardware, so that bogus connector numbers are rejected before they propagate further.

Affected products

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

References

• https://git.kernel.org/stable/c/f6dcbf2b024d55549959402f1db6c614e51d52cb ↗
• https://git.kernel.org/stable/c/f4e608fe12b7ac6a4a57176ab0296bb5a110a078 ↗
• https://git.kernel.org/stable/c/98429e9ec89a5e3a204112dfaa2dbe6ca28493a0 ↗
• https://git.kernel.org/stable/c/d2d8c17ac01a1b1f638ea5d340a884ccc5015186 ↗