Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/mcdope/pam_usb/issues/351
- https://github.com/mcdope/pam_usb/issues/55
- https://github.com/mcdope/pam_usb/security/advisories/GHSA-pvrg-chgw-x42c
FAQ
What is CVE-2026-48792?
CVE-2026-48792 is a vulnerability with a CVSS score of 4.4 (MEDIUM). 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_vir...
How severe is CVE-2026-48792?
CVE-2026-48792 has been rated MEDIUM with a CVSS base score of 4.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48792?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.