SecuriTricks - CVE-2026-47272

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.

Product(s) Impacted

Vendor	Product	Versions
Pam Usb	Pam Usb	<0.9.0, 0.9.0

Weaknesses

Common security weaknesses mapped to this vulnerability.

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.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	pam_usb	pam_usb	<0.9.0	/	/	/	/	/	/	/
a	pam_usb	pam_usb	0.9.0	/	/	/	/	/	/	/

References

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

CVSS Score

7.1 / 10

CVSS Data - 3.1

Attack Vector: LOCAL
Attack Complexity: LOW
Privileges Required: LOW
Scope: UNCHANGED
Confidentiality Impact: HIGH
Integrity Impact: HIGH
Availability Impact: NONE

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

View Vector String

Timeline

Published: May 27, 2026, 8:16 p.m.
Last Modified: May 28, 2026, 1:57 p.m.

Status : Deferred

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

CVE-2026-47272