CVE-2026-47272: Mcdope Pam USB

High severity, CVSS 7.1. EPSS: 0.2% chance of exploitation in the next 30 days.

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, the pusb_pad_compare() function in src/pad.c only verified that the user-side pad (~/.pamusb/device.pad) could be read, but did not enforce that the system-side pad (the pad file on the USB device) was also present and readable. If the user-side pad was deleted or unreadable, the function returned a failure that was treated as non-fatal in certain code paths, allowing authentication to succeed without the USB device being verified. A local user can delete their own ~/.pamusb/device.pad to remove the USB device requirement and authenticate without the physical device. This vulnerability is fixed in 0.9.0.

Affected products

• Mcdope Pam USB: before 0.9.0 (fixed in 0.9.0)

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