Out-of-bounds read in Linux kernel - CVE-2026-31729
Published: May 2, 2026
Vulnerability identifier: #VU128965
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-31729
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows an attacker with physical access to cause a denial of service.
The vulnerability exists due to an out-of-bounds array access in ucsi_connector_change() when processing a malformed connector number reported in the CCI. An attacker with physical access can connect a malicious or malfunctioning device to trigger the out-of-bounds access and cause a denial of service.
The issue occurs because the connector number is a 7-bit field that can exceed the number of connectors allocated by the device.
How to mitigate CVE-2026-31729
Install security update from vendor's repository.