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Linux Kernel USB Type-C Wcove Driver Buffer Overflow Vulnerability

A buffer overflow vulnerability, identified as CVE-2026-63960, exists in the `wcove_read_rx_buffer()` function within the USB Type-C `wcove` driver in the Linux kernel, potentially leading to memory corruption or system instability upon exploitation.

A significant security vulnerability, tracked as CVE-2026-63960, has been identified in the Linux kernel's USB Type-C wcove driver. Specifically, the flaw lies within the wcove_read_rx_buffer() function, where a buffer overflow can occur due to improper bounds checking. This allows an attacker to write data past the intended boundary of the struct pd_message buffer. While no active exploitation has been publicly reported, this type of vulnerability in kernel-level code is critical because it can lead to memory corruption, denial of service (system crash), or potentially arbitrary code execution with kernel privileges. The vulnerability affects systems running the Linux kernel that utilize the wcove USB Type-C controller. Defenders should prioritize patching to prevent potential compromise.

Attack Chain

  1. Crafted USB Device Interaction: An attacker connects a specially crafted USB Type-C device, or a legitimate device that has been reprogrammed, to a vulnerable Linux system.
  2. Driver Activation: The Linux kernel loads and initializes the wcove USB Type-C driver to handle communication with the connected device.
  3. Malicious Data Transmission: The crafted USB device sends a sequence of Power Delivery (PD) messages designed to exceed the expected size or format of the struct pd_message buffer.
  4. wcove_read_rx_buffer() Call: The wcove_read_rx_buffer() function is called by the kernel to process the incoming data from the USB Type-C device.
  5. Buffer Overflow Trigger: Due to insufficient bounds checking within wcove_read_rx_buffer(), the oversized or malformed data is written beyond the allocated memory space of the pd_message buffer.
  6. Memory Corruption: This out-of-bounds write corrupts adjacent kernel memory, potentially overwriting critical data structures or code pointers.
  7. System Instability/Privilege Escalation: The memory corruption can lead to system crashes (denial of service), or, if an attacker can precisely control the overwritten memory, achieve arbitrary code execution within the kernel context, leading to full system compromise and privilege escalation.

Impact

Successful exploitation of CVE-2026-63960 could result in significant impact, ranging from system instability and denial of service to full system compromise. If an attacker can achieve arbitrary code execution in the kernel, they would gain the highest level of privileges on the system, enabling them to bypass security controls, exfiltrate sensitive data, or install persistent malware. The direct impact would be on Linux-based systems utilizing the affected wcove USB Type-C controller, potentially affecting a broad range of devices from laptops to servers if the controller is present and exposed to malicious USB devices.

Recommendation

  • Patch CVE-2026-63960 by updating your Linux kernel to a version that includes the fix. Consult your Linux distribution's security advisories and update procedures immediately.