CVE-2026-47272

Published: May 27, 2026Modified: Jun 17, 2026Deferred

7.1

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Exploitability: 1.8 / Impact: 5.2

Source: security-advisories@github.com (Secondary)

Description

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.

Related CWEs

CWE-287

Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

CWE-908

Use of Uninitialized Resource

The product uses or accesses a resource that has not been initialized.

References (1)

https://github.com/mcdope/pam_usb/security/advisories/GHSA-vx6f-rrqr-j87c

Source: security-advisories@github.com

Timeline

No history available yet.