# CVE-2026-48792

## Summary

- **CVE ID:** CVE-2026-48792
- **Severity:** MEDIUM
- **CVSS Score:** 4.4 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)
- **CWE:** CWE-390, CWE-693
- **Published:** May 27, 2026
- **Last Modified:** May 28, 2026

## 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.

## Affected Products

- mcdope — pam_usb (< 0.9.1)

## References

- [CNA](https://github.com/mcdope/pam_usb/security/advisories/GHSA-pvrg-chgw-x42c)
- [CNA](https://github.com/mcdope/pam_usb/issues/351)
- [CNA](https://github.com/mcdope/pam_usb/issues/55)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.13%
- **EPSS Percentile:** 2.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._