CVE-2026-44712

pam_usb: Shell injection via device UUID and username in pamusb-conf and pamusb-agent

State: Published
Severity: 8.2 High
Published: May 27, 2026
Updated: May 28, 2026
Reserved: May 7, 2026

Description

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, a crafted UUID such as $(id>/tmp/rce) in the config causes root RCE when pamusb-conf --reset-pads is run. A USB device with a crafted filesystem UUID (some controllers allow this) can inject the payload at --add-device time. Also, userName from the XML config is passed to os.system() in pamusb-agent, which invokes a shell. This vulnerability is fixed in 0.8.7.

Scores

CVSS	Score	Vector	Source
3.1	8.2 High	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-88 Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

Affected Products

Product	Versions
pam_usbmcdope	< 0.8.7Affected

References

https://github.com/mcdope/pam_usb/security/advisories/GHSA-jgv5-w6rm-7wxg

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