CVE-2026-63958

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f < cea949203faef9cb783adc7b978cce056271e057affected
LinuxLinuxc1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f < 156b6f0aec6108909b0c4aedc78865b12766b347affected
LinuxLinuxc1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f < bd24d92af4ae021b6209f28e9a57e1bf2260d4fdaffected
LinuxLinuxc1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f < 0edd1e21587b0483c7ceb993b9fb9668bbef7433affected
LinuxLinuxc1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f < 5af2719b460ab904c504fc069d1dd2a3aa2b22b0affected
LinuxLinuxc1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f < 288a81a8507052bcfbf884d39a463c44c42c5fd9affected
LinuxLinux4.13affected
LinuxLinux0 < 4.13unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.93 <= 6.12.*unaffected
LinuxLinux6.18.35 <= 6.18.*unaffected
LinuxLinux7.0.12 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References