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linux-hwe-edge

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A vulnerability in the Linux kernel's USB Type-C Connector System Software Interface (UCSI) was resolved by adding validation for connector numbers in the ucsi_notify_common() function. The issue involved an out-of-bounds array access caused by a connector number extracted from hardware that could exceed the allocated array size. This flaw could be triggered by a malicious or malfunctioning device reporting an invalid connector number. The vulnerability has a high severity with a CVSS score of 7.8 and affects multiple Linux kernel versions prior to 6.8.0 and related builds. A patch is available and should be applied via standard system updates, which require a reboot and recompilation of third-party kernel modules due to ABI changes.

The Linux kernel contained a vulnerability in the USB Type-C UCSI driver where the connector number extracted from the Connector Capability Information (CCI) was not properly validated. The connector number is a 7-bit field but the kernel allocated an array sized only for the number of connectors reported by the device, typically 2-4. Without bounds checking, a malicious or malfunctioning device could supply an out-of-range connector number, leading to an out-of-bounds array access in the ucsi_connector_change() function. The fix added a bounds check in ucsi_notify_common(), the central parsing function for CCI data, to reject invalid connector numbers before they cause unsafe memory access. This vulnerability affects Linux kernel versions prior to 6.8.0 and related builds as listed. The vulnerability has a CVSS 3.1 score of 7.8 (high severity) with impact on confidentiality, integrity, and availability. The vendor has released patches, and users are advised to update and reboot their systems. Due to ABI changes, third-party kernel modules must be recompiled and reinstalled after the update.

Detailed information about UBUNTU-CVE-2026-31729 affecting null linux-hwe-edge. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-31729 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: validate connector number in ucsi_notify_common() The… (CVE-2026-31729)

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