Medium 4.4Published May 27, 2026

CVE-2026-48792pam_usb: pusb_has_virtual_input_device() silently discards EACCES, disabling remote desktop detection under non-root execution

Updated under an hour ago (Oct 26, 2026, 5:20 PM ET)

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It affects mcdope pam_usb. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for mcdope pam_usb

Exploited in the last 30 days

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: 4.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-390, CWE-693
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: May 28, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

mcdope pam_usb mcdope:pam_usb (from the name)	before 0.9.1	CNA record

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.