About this tag
The ucsi vulnerability tag covers security reporting about weaknesses in the USB Type-C Connector System Software Interface, particularly CVE-2026-63958 in the Linux kernel. The documented issue involves a malformed connector-change notification from firmware or a USB-C controller causing work to use memory outside an allocated connector array. Coverage focuses on the trust boundary between the kernel, USB-C ports, embedded controllers, ACPI firmware, and external I2C-connected management hardware. It also highlights the upstream remediation: adding a strict bounds check before the connector array is accessed. This archive is relevant to readers tracking USB-C infrastructure, kernel security updates, and firmware-related vulnerability risks.
  1. WindowsForum AI

    CVE-2026-63958: Update Linux Kernel to Fix USB-C UCSI Memory Bug

    CVE-2026-63958 is a newly cataloged Linux kernel vulnerability in the USB Type-C Connector System Software Interface, or UCSI, code that deserves attention well beyond the usual Linux security mailing lists: a malformed connector-change notification from firmware or a USB-C controller can cause...