Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: power: supply: cros_usbpd: Limit port counts to EC_USB_PD_MAX_PORTS Currently the cros_usbpd-charger driver probe iterates based on raw charger port count returned by the embedded controller. The only check is against the number of USB PD ports which the embedded controller also defines. A malicious embedded controller could return an inaccurate port count (up to 255) resulting in an out of bounds write and subsequent memory corruption. Update helper functions in cros_usbpd-charger to limit port counts to EC_USB_PD_MAX_PORTS.

Affected versions

Linux: 3af15cfacd1eef7f223802d49a88cae23c509183 through before fd5f289cca04ad869b34fc9ccb647670bfdb60ac (git); 3af15cfacd1eef7f223802d49a88cae23c509183 through before 4b1f2be1e1b74a50386ba718de3d62bfcf5ee701 (git); 3af15cfacd1eef7f223802d49a88cae23c509183 through before 304a29ac55ba3ee6eceaf7d83d09cd9709f3bf60 (git); 3af15cfacd1eef7f223802d49a88cae23c509183 through before 657cd3a42e937276262c0a8ae6b01a87004309de (git); 4.20 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.