CVE-2026-63958

Description

In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: validate connector number in ucsi_connector_change() The connector number in a UCSI CCI notification is a 7-bit field supplied by the PPM. ucsi_connector_change() uses it to index the ucsi->connector[] array without checking it against the number of connectors the PPM reported at init time, so a buggy or malicious PPM (EC firmware, or an I2C-attached UCSI controller on the ccg / stm32g0 / glink transports) can drive schedule_work() on memory past the end of the array. Reject connector numbers that are zero or exceed cap.num_connectors before dereferencing the array.

References

• https://git.kernel.org/stable/c/0edd1e21587b0483c7ceb993b9fb9668bbef7433
• https://git.kernel.org/stable/c/156b6f0aec6108909b0c4aedc78865b12766b347
• https://git.kernel.org/stable/c/288a81a8507052bcfbf884d39a463c44c42c5fd9
• https://git.kernel.org/stable/c/5af2719b460ab904c504fc069d1dd2a3aa2b22b0
• https://git.kernel.org/stable/c/bd24d92af4ae021b6209f28e9a57e1bf2260d4fd