CVE-2023-53168

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

usb: ucsi_acpi: Increase the command completion timeout

Commit 130a96d698d7 ("usb: typec: ucsi: acpi: Increase command

completion timeout value") increased the timeout from 5 seconds

to 60 seconds due to issues related to alternate mode discovery.

After the alternate mode discovery switch to polled mode

the timeout was reduced, but instead of being set back to

5 seconds it was reduced to 1 second.

This is causing problems when using a Lenovo ThinkPad X1 yoga gen7

connected over Type-C to a LG 27UL850-W (charging DP over Type-C).

When the monitor is already connected at boot the following error

is logged: "PPM init failed (-110)", /sys/class/typec is empty and

on unplugging the NULL pointer deref fixed earlier in this series

happens.

When the monitor is connected after boot the following error

is logged instead: "GET_CONNECTOR_STATUS failed (-110)".

Setting the timeout back to 5 seconds fixes both cases.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References