CVE-2026-48792: Mcdope Pam USB

Medium severity, CVSS 4.4. EPSS: 0.2% chance of exploitation in the next 30 days.

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.1, src/evdev.c silently ignores EACCES errors when opening /dev/input/event* nodes, causing pusb_has_virtual_input_device() to return 0 (no virtual devices found) even when every open() call failed due to insufficient permissions. The caller in src/local.c cannot distinguish a clean absence of virtual devices from a permission-denied scan, and acts on the false negative by continuing authentication without denying. This vulnerability is fixed in 0.9.1.

Affected products

• Mcdope Pam USB: before 0.9.1 (fixed in 0.9.1)

Published 2026-05-27. Last modified 2026-06-17.