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CVE-2026-48792

Published: May 27, 2026

Modified: May 28, 2026

PUBLISHED

CVSS v3.1

4.4

MEDIUM

Description

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.

Vendor	Product	Versions
mcdope	pam_usb	affected `< 0.9.1`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

References

https://github.com/mcdope/pam_usb/security/advisories/GHSA-pvrg-chgw-x42c

x_refsource_CONFIRM

https://github.com/mcdope/pam_usb/issues/351

x_refsource_MISC

https://github.com/mcdope/pam_usb/issues/55

x_refsource_MISC

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