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CVE-2026-48980

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

Published: Jun 18, 2026Updated: Jun 22, 2026 Sources: CVE List NVDCWE-454
NVD MITRE
6.3CVSSMEDIUM
EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:LAC:HPR:LUI:NS:UC:HI:HA:N
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-454CWE-807

Affected Products

pam_usbmcdope
Library
Operating Systems / linux-distro
mcdopeoss-projectOperating Systemsaka pam_usb

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

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

Timeline

Published
Jun 18, 2026
Last Updated
Jun 22, 2026

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