CVE-2026-48980

pam_usb: getenv() used in PAM context allows environment variable injection into local-check logic

State: Published
Severity: 6.3 Medium
Published: Jun 18, 2026
Updated: Jun 18, 2026
Reserved: May 26, 2026

Description

pam_usb provides hardware authentication for Linux using removable media. In versions prior to 0.9.2, getenv() environment variables XRDP_SESSION, DISPLAY and TMUX allow environment variable injection into local-check logic. These environment variables influence whether a current session is local or remote, and a PAM module that runs in the context of setuid binaries (sudo, su), getenv() returns attacker-controlled values whenever the process environment has been manipulated by a local user. This issue has been fixed in version 0.9.2.

Scores

CVSS	Score	Vector	Source
3.1	6.3 Medium	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-454 External Initialization of Trusted Variables or Data Stores
CWE-807 Reliance on Untrusted Inputs in a Security Decision

Affected Products

Product	Versions
pam_usbmcdope	< 0.9.2Affected

References

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