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Informational 21 Bitcoin

chore(core/eckhart): implement BLE device unpairing

Public commit record

What the developer wrote

Authored by Lukas Bielesch

62/100 · Adequate
chore(core/eckhart): implement BLE device unpairing

[no changelog]
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Uses a recognizable type or scope! No meaningful explanatory body
The short version

What changed, and why it matters

This commit adds the ability for a Trezor hardware wallet to forget (unpair) a specific Bluetooth device by its MAC address, instead of only being able to unpair the currently connected device or all devices. It is a feature-completion change for the new Eckhart model's Bluetooth settings menu. There is no direct evidence in the commit that this fixes a security vulnerability; it appears to be a routine user-facing feature implementation.

Recommended action

No immediate security action required. As a defensive review note, verify that the 6-byte MAC conversion (`iter_into_array`) rejects inputs of other lengths safely and that the BLE stack's `ble_unpair` handles a null or unmatched pointer correctly. Review whether the new `addr` field can be sent from an untrusted host and whether that path requires additional authorization or UI confirmation.

Security signals we found

01

New wire message field `addr` added to `BleUnpair` (protobuf field 2, bytes)

02

Rust micropython binding now accepts a 6-byte bytes-like or None and converts via `iter_into_array`

03

UI flow now uses `show_warning`/`show_success` instead of `confirm_action`

04

No visible bounds/length check on `addr` other than the array conversion itself

05

Bond lookup is linear and returns on first MAC match; no match raises an exception

Risk score

Why this scored 21/100

Our methodology →
Potential impact 2/30
Exploitability 3/25
Stealth signal 2/15
Affected reach 4/15
Confidence 7/10
Evidence quality 3/5
Human-validated context

Community notes

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