SB20260502116 - Out-of-bounds read in Linux kernel typec ucsi driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-31729)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/98429e9ec89a5e3a204112dfaa2dbe6ca28493a0
• https://git.kernel.org/stable/c/d2d8c17ac01a1b1f638ea5d340a884ccc5015186
• https://git.kernel.org/stable/c/f4e608fe12b7ac6a4a57176ab0296bb5a110a078
• https://git.kernel.org/stable/c/f6dcbf2b024d55549959402f1db6c614e51d52cb