PT-2026-44085 · Pam Usb · Pam Usb

Mcdope · Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-47272

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions pam usb versions prior to 0.9.0

Description The pusb pad compare() function in src/pad.c only verifies that the user-side pad (~/.pamusb/device.pad) is readable, without ensuring the system-side pad on the USB device is present and readable. If the user-side pad is deleted or unreadable, the function returns a failure that some code paths treat as non-fatal, allowing authentication to succeed without verifying the USB device. Consequently, a local user can delete their own ~/.pamusb/device.pad to bypass the physical USB device requirement.

Recommendations Update to version 0.9.0.

Fix

Improper Authentication

Use of Uninitialized Resource

Weakness Enumeration

CWE-287

CWE-908

Related Identifiers

CVE-2026-47272

Affected Products

Pam Usb

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-47272 · Security Note
• https://github.com/mcdope/pam_usb/security/advisories/GHSA-vx6f-rrqr-j87c · Note
• https://t.me/CVEtracker/55170 · Telegram Post