CVE-2026-48980 | pam_usb provides hardware authentication for Linux using rem… | CVSS 6.3 MEDIUM

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.

Metadata

CVE ID: CVE-2026-48980
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-05-26 23:26 UTC
Published: 2026-06-18 19:26 UTC
Last updated: 2026-06-18 20:25 UTC
Primary CWE: CWE-454
CWE-454: External Initialization of Trusted Variables or Dat…
Vendor / Product: mcdope / pam_usb
Sources: cve.org · NVD

Severity & Metrics

6.3 MEDIUM CVSS 3.1

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
mcdope	pam_usb	—	< 0.9.2

Weakness (CWE)

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

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.3	MEDIUM	3.1	cna	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

References (2)

https://github.com/mcdope/pam_usb/security/advisories/GHSA-qr83-mf3h-fvqr https://github.com/mcdope/pam_usb/security/advisories/GHSA-qr83-mf3h-fvqr
https://github.com/mcdope/pam_usb/releases/tag/0.9.2 https://github.com/mcdope/pam_usb/releases/tag/0.9.2